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Eddy Current Dynamometer Operator`s Manual

1. 39 LOADING e M A 40 NORMAL OPERATION AND PERFORMANCE PROFILE 40 SECTION 7 MAINTENANCE 41 sisi 41h oi 41 INSPECTION Mem TC 41 oz rT D 42 III f M 42 MAINTENANCE SCHEDULE 43 STORAGE m NN 45 SECTION 8 TROUBLESHOOTING 46 4 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS Table of Contents DPD 002 04 Copyright Dyne Systems Inc SECTION 9 PARTS AND SERVICE 47 47 ORDERING INSTRUCTIONS 47 47 00 UE 47 47 47 SECTION 10 PRODUCT WARRANTY 48 WARRANTY REMEDIES AND LIMITATIONS rs 48 APPENDIX A DEFINITIONS FORMULAS 49 APPENDIX B ACRONYMS 50 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS Table of Contents 5 DPD 002 04 Copyright Dyne Systems Inc SECTION 1 GENERAL INFORMATION Dyne Systems Inc hereafter referred to as DS is the sole Original Equipment Manufacturer OEM of Midwest and Dynamatic brand Eddy Current dynamometers This manual intended for qualified personnel only contains instructions for proper handling installation operation and maintenance of both Midwest and Dynamatic absorption dynamometers
2. 10 of rated voltage e Line Frequency Variation 2 Hertz Clear of dust dirt moisture and vapors e Allow sufficient clearance to permit free passage of air and provide access for maintenance personnel Adhere to the following guidelines when wiring dynamometer control equipment e Coolant Thermocouples signal wires should NOT exceed 50 feet e Load Cell signal wires should be in metallic conduit and NOT exceed 50 feet e Torque Transducers signal wires should be in metallic conduit and NOT exceed 100 feet e Encoder signal wires should be in metallic conduit and NOT exceed 100 feet e Magnetic Pickup signal wires should be in metallic conduit and NOT exceed 100 feet Installation requires the job site to be free from debris and all heavy construction especially overhead Always provide appropriate personal protective equipment for installers Electric welding equipment must be solidly earth grounded and shall NEVER use bearings as a path to ground Do NOT use equipment and controllers as an electrical path FOUNDATION AND MOUNTING Failure to follow these guidelines and procedures invalidates the DS warranty Equipment must be adequately supported to prevent excessive vibration distortion and settling Failure to properly mount equipment can result in mechanical or electrical failures and affect performance Electrical accessories also require support to prevent abrasion to insulation and failure of co
3. BEARINGS The rotor shaft assembly is placed inside the stator housing with both shaft ends extending past the stator housing and supported by high speed ball bearings rotor bearings installed in trunnions attached to end covers assembled to both ends of the stator housing Self aligning bearings trunnion bearings are installed on the nose of the trunnions and bearing rotators if applicable are assembled on the O D of the bearings Rotor bearings refer to Figure 2 1 Item 4 are located on the rotor shaft assembly Rotor bearings are either deep groove or angular contact high speed anti friction ball bearings with special internal tolerance to provide maximum bearing life in the magnetic and temperature environments of an eddy current dynamometer Rotor bearings are either grease or oil lubricated Trunnion bearings refer to Figure 2 1 Item 5 are installed on the nose of the trunnions Trunnion bearings are provided for trunnion mounting the dynamometer carcass to minimize errors in torque measurement However they do allow the carcass to rotate slightly for torque measurements Trunnion bearings are double row self aligning anti friction ball bearings Trunnion bearings are grease lubricated Typically trunnion bearings are mounted in manually rotatable outer bearing race retainers known as rotators or shift rings If applicable rotators shift rings allow manual rotation of the trunnion bearings to prevent brinelling flat spots
4. Copyright Dyne Systems Inc LUBRICATION SYSTEMS CONTINUED CONSTANT LEVEL OILER OIL LEVEL HIGH SPEED BEARING Figure 3 2 Typical Constant Level Oiler Connected to Rotor Bearing High speed dynamometers require a pressurized re circulating oil system to adequately lubricate rotor bearings refer to Figure 3 3 Pressurized re circulating oil systems require a pump and motor to supply oil to the bearing chambers A reservoir is mounted on a platform attached to the dynamometer base The pump and motor are attached to the reservoir Most fittings and tubing are attached to the dynamometer frame A gauge and filter are provided Special fittings are installed at the bearing caps on the dynamometer carcass and should not be removed If required refer to the provided Pressurized Re Circulating Oil System OEM literature for additional information This type of lubrication system can be furnished for standard speed dynamometers upon request OIL DRIP FEED amp SIGHT GLASS SUPPLY LINE OIL RESERVOIR Figure 3 3 Typical Pressurized Re Circulating Oil System 26 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 3 Install amp Setup DPD 002 04 Copyright Dyne Systems Inc LOAD MEASURING SYSTEM The load strut assembly consists of a strut and rod end on each end fitted in the load cell and attached to the torque arm with a shoulder screw Jam nuts are used to secure the length adjustment The load measur
5. To safeguard against high temperature failure dynamometer overload a Exit Coolant High Temperature Cut Off Switch is recommended in dynamometer drain sump WIG or outlet piping DG To check this switch use the following procedure 1 2 Turn power OFF Remove switch and disconnect wiring Connect ohmmeter to switch leads to ensure switch is normally closed Insert switch in water heated to 71 C 160 F The switch should open If an adjustment is required loosen small screw at base of switch and adjust larger screw until it operates at 71 C 160 F Lock adjustment by tightening the small locking screw NOTE prevent nuisance trips the switch is set 20 F higher than expected full load full load maximum temperature of 140 Refer to Section 2 Cooling System 6 7 Recheck switch to ensure it operates at 71 C 160 F When re installing switch apply pipe thread compound and tighten finger tight Tighten lightly with wrench Do NOT over tighten or switch setting will change Connect wires and re check to ensure proper operation 0 If a safety device is wired incorrectly or jumpered out it is useless It is vitally COOLANT FLOW SWITCH important to make certain the safety interlocks will work In some systems a flow switch may be added to the cooling system for additional safety To check the switch use the following procedure 1 2 Turn ON the coolant supply Using a flow meter set
6. 90 F ata MINIMUM regulated pressure of 45 or 55 PSI depending upon make and model refer to nameplate on unit The MAXIMUM permissible pressure is 100 PSI 24 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 3 Install amp Setup DPD 002 04 Copyright Dyne Systems Inc COOLING SYSTEM PIPING Coolant flow required to cool the dynamometer depends on inlet temperature and HP absorbed In WIG dynamometers flow is controlled with a coolant modulating valve Minimum flow is determined by design and maximum flow by thermal dissipation required The maximum flow can be approximated at 1 GPM per 10 HP absorbed For example a 350 HP dynamometer requires a maximum 35 GPM of coolant A gravity drain is required to accommodate the calculated flow rate Outline dimension drawings show inlet piping size for WIG and inlet and outlet piping size for DG dynamometers Do NOT use smaller size pipe than specified in these drawings WIG dynamometers drain coolant by gravity into the drain pan located under the dynamometer The drain pan piping requires a minimum slope drop of inch per foot On long runs a vent is needed to relieve back pressure The direction of flow is typically indicated on each device used in the coolant piping system If using a Closed Loop Cooling System it is imperative all air be removed from the system prior to operation If applicable make sure the solenoid valve is open while the closed loop cooling syste
7. All DS approved drawings if included and specific instructions for this equipment must take precedence over general information contained in this manual All inquires related to either Midwest or Dynamatic dynamometers should be directed to DS at 800 657 0726 SAFETY Read your User Manual Electrical rotating machinery can be dangerous with the potential to cause injury or death if operated and or installed incorrectly Become familiar with all safety instructions and procedures WARNING CAUTION WARRANTY and NOTE labels are used throughout the manual to remind you of the hazards that exist Know your equipment before handling or working on it used to warn of the possibility of injury to personnel and damage to equipment used to caution of potential hazards and unsafe practices NY used to identify guidelines and procedures that invalidate the DS Warranty if not 4 followed properly NOTE used for special instructions related to safety proper operation or maintenance RECEIVING INSPECTION Upon arrival of your equipment check all items received against the packing slip to ensure the shipment is complete Then inspect for damage Any evidence of rough handling may be an indication of hidden damage The following checks are offered to aid your inspection 1 Inspect packaging and skid s for any mistreatment Document and photograph any signs of damage 2 Itis standard practice DS to ship all dynamometers via air
8. 0 17 FOUNDATION 17 UNIT 18 MOUNTING 0 19 SHAFT TIR 20 SHAFT AND COUPLING HUB PREPARATION 21 ALIGNMENT FOR SHAFT 22 23 OFFSET 24 SHAFT CRITICAL SPEED AND OVERHUNG 24 ELECTRICAL UN aeree 0 24 COOLING SUPPLY ANDMEDIUM 24 COOLING SYSTEM PIPING 25 25 LOAD 27 Systems WATER COOLED EDDY CURRENT DYNAMOMETERS Table of Contents 3 DPD 002 04 Copyright Dyne Systems Inc TABLE OF CONTENTS CONTINUED SECTION 4 CHECKS AND ADJUSTMENTS 28 mU c rrt rnaar 28 CARCASS MOVEMENT T 28 ANTI ROTATION SAFETY titu derit asa beri ttu 29 LOAD STRUT AND ROD ENDS 29 WATER 30 AUTOMATIC PIPING 31 ae oe te eae 31 DISCI n RN A eae 32 COOLANT PRESSURE SWITCH 32 32 COOLANT 33 EXIT COOLANT TEMPERATURE SWITCH 34 COOLANT 8 34 CONSTANT LEVEL 35 PRESSURIZED RE CIRCULATING OIL SYSTEM cssessssscssessecsecssssseseesssseessssssersesnensersess 35 MAGNETIG 36 SECTION 5 DEAD WEIGHT CALIBRATION 37 SECTION 6 OPERATION 39 n Ml
9. Calibration on Pedestal Type Dynamometer 38 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 5 Dead Weight Cal DPD 002 04 Copyright Dyne Systems Inc SECTION 6 OPERATION NEVER be in the test cell while dynamometer is in operation Failure to follow these guidelines and procedures invalidates DS warranty INITIAL START UP After completing preliminary checks and adjustments the dynamometer is ready for initial start up This does not imply that the unit can be started and left unattended Start up should be slow and careful 1 Increase load and speed gradually constantly monitoring vibration and temperature As load is applied the first area of concern is COOLING Make sure the system is working and the temperature is being regulated 2 Second monitor for VIBRATION with an accelerometer while speed is being increased When measuring vibration locate the accelerometer probe in both horizontal and vertical positions Refer to Figures 6 1 or 6 2 for locations on either an enclosure type or pedestal type dynamometer Vibration should be maintained within the following specifications 3600 RPM and less should not exceed 0 20 V in sec 3601 RPM and greater should not exceed 0 15 V in sec If vibration increases with speed this is an indication of coupling misalignment looseness overhung weight soft foot or balancing issue VERTICAL VIBRATION SENSOR LOCATION run cM ME CM MCI HORIZONTA
10. DyneSystems Inc Midwest amp Dynamatic Dynamometers Water Cooled Eddy Current Dynamometers USER MANUAL Dynamometer Model O Midwest Dynamatic Type O Dry Gap Wet Gap Model Serial HP Rating Speed Range Job www dynesystems com DPD 002 04 From Dyne Systems Inc Dyne Systems is the sole owner of original OEM drawings and specifications for both Midwest Dynamometer amp Engineering Company and Eaton Dynamatic Dynamometers Midwest and Dynamatic dynamometers built their reputations on being robustly engineered for a long life of demanding service Going back to the 1930s Midwest and Dynamatic have been time honored and well respected manufacturers of eddy current dynamometers Today s materials technology engineering and manufacturing techniques have all contributed to significant improvements in eddy current dynamometer design and manufacturing Midwest and Dynamatic product lines provide a complete range of dynamometers from 5 to 5 000 horsepower Our dynamometer team specializes in manufacturing and remanufacturing Midwest and Dynamatic dynamometers with the capability of restoring model years as far back as the 1930s to today s improved OEM specifications NOTE This manual is intended for use by qualified personnel only All Dyne Systems approved drawings if included and specific instructions for this equipment must take precedence over general information contained in this manual T
11. The amount of coolant required to hold the coolant exit temperature below 140 F with inlet coolant at 90 F maximum is 1 GPM for each 10 HP of dissipation Minimum coolant pressure required is either 45 or 55 PSI depending upon model refer to nameplate at the inlet to the dynamometer The cooling system also includes an On Off solenoid valve and Y Strainer to ensure the cooling medium is clean A cooling system is always furnished with WIG dynamometers and can be supplied with DG dynamometers upon request 14 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 2 Description DPD 002 04 Copyright Dyne Systems Inc LUBRICATION An absorption dynamometer has both trunnion and rotor bearings requiring lubrication Rotor bearings are lubricated with one of the following methods 1 Most commonly Constant Level Oilers are used Flexible hoses are routed to the inlets from two constant level oiler assemblies mounted on the dynamometer frame and their heights are adjusted to maintain a specific oil level within the bearing chambers High speed machines require a pressurized re circulating oil system with a pump reservoir assembly mounted on the dynamometer frame Vertical horizontal dynamometers require greased bearings With grease bearings fittings are provided in the inlets for adding grease Trunnion bearings are lubricated with a low viscosity grease SAFETY DEVICES The following safety devices are included with
12. all standard dynamometers 1 Anti Rotation Safety Stop Limits the amount of travel of the dynamometer carcass in the event of a torque arm failure or failure in the strut linkage to the load cell Coolant Temperature Switch Located in the drain box assures the exit coolant temperature is not exceeding a predetermined set point The temperature switch has an N C contact which will open upon fault Coolant Pressure Switch Located on the inlet side of the cooling system assures coolant is flowing prior to starting the dynamometer and or signals a loss of coolant flow during operation The pressure switch has an N C contact which will open upon fault Oil Pressure Switch only applicable with a pressurized re circulating oil system Located in the oil pump system assures oil pump is operating The pressure switch has a N C contact which will open upon fault Flow Switch only applicable on DG dynamometers Located in cooling system assures coolant is flowing at required GPM The flow switch has a N C contact which will open upon fault The following safety device is optional 1 SPEED MEASUREMENT Bearing RTDs Located in bearing trunnions assures bearing temperatures do not exceed bearing OEM temperature specifications The accurate measurement of speed is equally important as accurate measurement of torque in determining absorbed horsepower This is accomplished in all Midwest and Dynamatic dynamometers by us
13. because angular or offset misalignment between them will cause increased bearing loads and vibration Flexible shaft couplings will minimize the error but proper alignment is required Consult the manufacturer s instructions for the degree of misalignment that the flexible coupling can tolerate in your application without imposing damaging load on dynamometer bearings The manufacturer will provide maximum operating alignment limits for offset and angular misalignment When the dynamometer is to be operated at high speeds shaft alignment becomes very critical A laser alignment tool and or calibrated dial indicator should always be used to check alignment Consider the following factors 1 Shaft coupling misalignment design figures are indications of the mechanical angle through which the shaft coupling can be deflected Operating limits are the maximum figures to be used for your installation 2 The coupling can operate at either maximum offset or angular operating limits but NOT simultaneously When one is at maximum the other should be reduced to zero Refer to the coupling OEM s specifications 3 Determine the float capability of the couplings and its effect on the misalignment limits 4 Consider equipment tolerances movement of support structure thermal growth axial movement external shocks and vibration that will change the relative position and alignment To minimize vibration and prolong dynamometer bearing life DS r
14. maximum torque available from the dynamometer use the horsepower and base speed stamped on the dynamometer nameplate Calculate torque using the following formula Torque HP x 5252 RPM Multiply the maximum torque value by 0 80 Use this value as your calibration torque Knowing the calibration arm length and calibration torque determine the NIST certified weights required Weight Required Calibration Torque Calibration Arm Length Apply the weights to the weight hanger Remember to include the weight of the hanger or use a weight hanger on both calibration arms to negate the weight of the hangers Controller should display corresponding torque value as determined in Step 6 Remove weights weight hanger and calibration arms and store in a controlled environment DPD 002 04 Copyright Dyne Systems Inc Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 5 Dead Weight Cal DEAD WEIGHT CALIBRATION CONTINUED CALIBRATION ARM LENGTH 4 TORQUE ARM LENGTH LOAD CELL C Figure 5 1 Calibration on Enclosure Type Dynamometer CALIBRATION ARM LENGTH TORQUE ARM LENGTH Figure 5 2
15. of the manual is intended to provide assistance in finding the fault Check the obvious first then follow the Trouble Shooting Guide Dynamometer will not Load Dynamometer Stops Operation Controller malfunction no coil excitation Loose or incorrect wiring Defective field coil Water pressure oil pressure or temperature switch open Vibration from imbalance or misalignment Bearing failure Improper mounting Shaft coupling loose Overloaded Lack of coolant Defective modulating valve Plugged cooling passages Bearing damage High thrust load Lack of or wrong lubricant Misalignment Bent shaft Controller malfunction Overload causing collapsed rings and locked rotor Safety interlock operating Cooling or lubricant failure Erratic Operation Controller malfunction Trunnion bearing binding Load measuring system malfunction Surging coolant Defective bearing Speed feedback malfunction Torque feedback malfunction Electrical noise Loose electrical connection Dynamometer not statically balanced Hoses binding the dynamometer carcass Trunnion bearings dirty or worn 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 5 1 2 3 4 1 2 3 4 5 6 7 8 9 1 2 3 4 Load cell linkage is loose Table 8 1 Troubleshooting Guide 46 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 8 Troubleshooting DPD 002 04 Copyright Dyne Systems Inc SECTION 9 SPARE
16. on each ball of the races Brinelling of the trunnion bearings can restrict the rotation of the carcass assembly causing erroneous torque readings 10 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 2 Description DPD 002 04 Copyright Dyne Systems Inc A typical Speed Torque curve of an absorption dynamometer is shown in Figure 2 2 The positive torque characteristics its tendency to rise slightly with an increase in speed under fixed excitation provides stable operation while its broad range at constant power accommodates a wide range of testing applications 100C 3000 Maximum Torque X ft Ibs Y rpm Dynamometer Model 200 i 1 1 P 2400 1 t 800 1 2100 N 700 Em IN 25 Constant Power Xhp from Y to Zrpm amp 1800 PN 1 600 i 1500 2 500 3 1 1 i 1 1 120 400 1 as 1 1 si 900 300 b i j 600 200 d 1 1 1 300 4r Water Drag at full flow of N gpm 100 rmm PU qo b du quse terns 1 peonpi 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 Torque WaterDr
17. proportion to the strength of the eddy current reactive fields developed by the rotor teeth The strength of the main inductor ring magnetic field is controlled by adjusting the excitation current to the field coil The braking torque is measured by connecting a load cell to a torque arm which is attached to the trunnion mounted stator The torque and speed data are the basis for the horsepower calculation The dynamometer can rotate in either direction as determined by the prime mover Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 2 Description 11 DPD 002 04 Copyright Dyne Systems Inc EDDY CURRENT THEORY CONTINUED TOOTHED STATOR SMOOTH ROTOR AIR GAP B Figure 2 3 Smooth Rotor Inductor Drum and Toothed Stator STATIONARY INDUCTOR RING GAP Figure 2 4 Toothed Rotor and Smooth Stator Inductor Rings 12 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 2 Description DPD 002 04 Copyright Dyne Systems Inc COOLING PRINCIPLES Dry Gap Wet Gap In the absorption dynamometer the power transmitted to the unit at the shaft is converted to heat by eddy currents developed in the field iron The heat to be liberated is developed almost entirely on or near the inner surface of the inductor rings and the outer surface of the rotor Coolant is circulated through the stator assembly behind the inductor rin
18. temperature limitations 10 C 50 F to 50 C 120 F Humidity should not exceed 60 Open all airtight coverings to permit air circulation Vibrations from heavy moving vehicles can be transmitted through the floor Avoid storage in heavy traffic areas as bearing damage may result On a monthly basis rotate shaft by hand to lubricate bearings and alternate shaft position to prevent brinelling Store in clean dry area within the following temperature limitations 10 C 50 F to 50 C 120 F Humidity should not exceed 60 Open all airtight coverings to permit air circulation Vibrations from heavy moving vehicles can be transmitted through the floor Avoid storage in heavy traffic areas as bearing damage may result Prepare an anti rust water mixture of 50 parts water to one part DuPont No 7 Rust Inhibitor to prevent rusting inside dynamometer carcass cooling passages and sump Pump mixture into normal coolant inlets and allow drainage in normal manner Operate Wet Gap dynamometers at minimum of 1750 rpm Dry Gap dynamometers do not require rotation Drain anti rust water mixture To prevent damage from coolant freezing open drain cocks or pipe plugs provided Tag dynamometer to indicate drains are open For protection of oil lubricated bearings prepare an anti rust oil mixture Select a high grade mineral oil resistant to rust and oxidation with a viscosity of 200 to 320 S U S 38 C 100 F Mix four parts oil to one part Q
19. IS CLAIMED TO THE EXCLUSION OF ANY AND ALL OTHER REMEDIES IN NO EVENT SHALL DYNE SYSTEMS BE LIABLE FOR SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES INCLUDING WITHOUT LIMITATION LOSS OF USE OR PROFITS NO AGREEMENT VARYING OR EXTENDING THE FOREGOING WARRANTIES REMEDIES OR THIS LIMITATION WILL BE BINDING UPON DYNE SYSTEMS UNLESS IN WRITING SIGNED BY A DULY AUTHORIZED OFFICER OF DYNE SYSTEMS DYNE SYSTEMS LIABILITY FOR FAILURE TO COMPLY WITH ANY WARRANTY OR REPRESENTATION HEREUNDER SHALL BE LIMITED TO THE VALUE OF THE GOODS SOLD HEREUNDER Excluding equipment made for integrated systems supplied or made by Dyne Systems Dyne Systems makes no warranty on the use of the equipment in combination with other products or in the practice of any process and if a claim suit or action is based thereon Buyer shall defend indemnify and save Dyne Systems harmless therefrom LIMITATION OF LIABILITY Dyne Systems liability for defective or nonconforming products whether based on breach of warranty negligent manufacture or product liability is exclusively limited to repair or replacement at Dyne Systems election of such products Dyne Systems assumes no risk and shall be subject to no liability for any damages or loss resulting from the specific use application made of the Products Systems liability for any other claim whether based on breach of contract negligence or product liability relating to the products shall not exceed the price paid by Buy
20. IZE the solenoid The gauge should indicate coolant pressure To reduce coolant pressure manually throttle back on an inlet hand valve The switch should open at 15 PSI and close at higher pressure If switch is set incorrectly adjust slotted screw at top of yoke holding the microswitch until switch drops out as coolant pressure falls to 15 PSI Although minimum pressure is 45 or 55 PSI depending on the unit the pressure switch is set at 15 PSI to allow for momentary coolant surges Make sure electrical power is OFF when reconnecting pressure switch Return power and turn controller ON Be sure that low coolant pressure will shut OFF the controller and remove excitation from dynamometer coil The Constant Flow Valve restricts flow at a predetermined rate typically 10 of maximum flow It is used to allow initial flow of coolant until the modulating valve opens This is a factory setting that cannot be changed 32 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 4 Check amp Adjust DPD 002 04 Copyright Dyne Systems Inc COOLANT MODULATING VALVE The Coolant Modulating Valve regulates the flow of coolant through the dynamometer based on the exit coolant temperature As the exit coolant temperature rises the modulating valve opens to increase the flow of coolant To check if valve is working remove bulb from sump and immerse it alternately in water of 24 C 75 F and 50 C 122 F Observe the valve stem for movemen
21. L VIBRATION SENSOR LOCATION Figure 6 1 Accelerometer Probe Locations Enclosure Type Dynamometer Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 6 Operation 39 DPD 002 04 Copyright Dyne Systems Inc INITIAL START UP CONTINUED E mx Tur VERTICAL VIBRATION SENSOR LOCATION t ORIZONTAL VIBRATION SENSOR LOCATION EN 4 m 1 T LT 3 lt d B Un Figure 6 2 Accelerometer Probe Locations Pedestal Type Dynamometer 3 Listen for bearing noise and monitor rotor bearing temperatures Rotor bearings should not run over 65 C 149 F even with high speed machines Bearing temperatures can be obtained from RTD s optional or using an infared gun near the bearing area 4 Record test data at periodic intervals Temperature readings should level off The data can serve as a performance profile LOADING Observe load limits of dynamometer Overloading will cause overheating shorten dynamometer life promote mineral deposits on heat transfer surfaces and generate thermal stresses in the unit All personnel must know operating limits and re
22. OOLED EDDY CURRENT DYNAMOMETERS 3 Install amp Setup 19 DPD 002 04 Copyright Dyne Systems Inc SHAFT MEASUREMENT To check dynamometer shaft TIR use a dial indicator with 0001 increments and a magnetic base 1 Clean the shaft with a polishing cloth and a clean rag prior to measurement Dirt and surface abrasions can affect the readings 2 Position the indicator measuring pin near the end of the shaft Make sure the pin is making contact with the shaft refer to Figure 3 1 3 Lock down the magnetic base a loose base will affect readings 4 Set the indicator dial to read zero 5 Rotate the shaft 360 or up to the keyway Note the dial indicator movement and record the reading Figure 3 1 Shaft TIR Diagram Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 3 Install amp Setup DPD 002 04 Copyright Dyne Systems Inc SHAFT AND COUPLING HUB PREPARATION Failure to follow these guidelines and procedures invalidates the DS warranty After inspection remove dirt rust and protective coatings from shaft Before installing shaft couplings clean shaft with a safe solvent Remove burrs with a fine file or fine Emory cloth Do NOT use abrasives or sandpaper Do NOT allow solvent to get bearing this will cause bearing damage Review manufacturer s assembly procedure for proper installation Make sure the coupling hub has been properly balanced Check that all parts are in place before pres
23. Oil types provided by Dyne Systems are based upon the oil system supplied with the dynamometer These are listed below in Table 7 3 Constant Level Oiler Exxon Nuto H 68 Oil Circulating System Mobil Nuto H 32 Oil Mist Lubrication System Mobil Mist Lube 27 Table 7 3 42 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 7 Maintenance DPD 002 04 Copyright Dyne Systems Inc MAINTENANCE SCHEDULE GUIDELINES DAILY Check Oil Level The following are only guidelines if the dynamometer is used extensively or in a harsh environment the maintenance schedule will need to be adjusted accordingly Please choose the instructions below that pertain to your type of system Constant Level Oiler 1 2 4 It should be between and 34 full Do NOT over fill Turn the reservoir bottle counter clockwise Lift the bottle from oiler Fill bottle using Exxon Nuto H 68 librication oil or similar oil Quickly install bottle on oiler Oil will flow from the bottle until the bearing chamber and tube of the oil have been filled with oil Fill the bottle as many times as necessary until the oil level in the bottle remains constant The oil level must be visible in the transparent bottle of the oil reservoir at all times while the dynamometer is in operation Do NOT allow the reservoir to run dry The position of the oilers with respect to the bearing centers has been established at the factory for proper operation of the
24. PARTS PARTS AND SERVICE Good maintenance alone is not always enough to keep equipment running To provide additional services to our clients DS maintains an aftermarket sales and service department at our Jackson Wisconsin location The services offered include technical assistance field service engineers factory repair service and renewal parts stock Each installation is different depending on the output volume of the machine Complete parts lists and other renewal parts information is available on request Prices can be obtained from the Service Department at DS ORDERING INSTRUCTIONS FIELD SERVICE REPAIR SERVICE To ensure correct parts are furnished include complete nameplate data from your specific unit purchase order number description of the part and quantity required The nameplate lists the Model number and Serial Number These numbers are necessary to identify the unit and the parts required Parts will be shipped from stock or manufactured on receipt of order depending on usage of the part We employ trained field service engineers at the factory Assistance can be provided by telephone or by a field trip if circumstances require Any item returned will be repaired on a time and material basis if deemed repairable unless a quotation is requested before authorizing the repair SHIPPING REQUIREMENTS ON SITE REPAIRS Please contact your Sales representative prior to sending product in for repair All dynamomete
25. SET MISALIGNMENT Failure to follow these guidelines and procedures invalidates DS warranty To check offset misalignment mount a calibrated dial indicator to one coupling hub and indicate O D of the other Scribe a reference point on coupling hub where the indicator is positioned Turn both shafts simultaneously 360 Divide the Total Indicator Reading TIR in half to obtain actual offset between shafts When manufacturer s limits are not available we suggest offset alignment limits of 0 001 0 002 TIR The procedure given is based on standard speed dynamometers Divide these allowable misalignment tolerances half for high speed dynamometers SHAFT CRITICAL SPEED AND OVERHUNG LOADS ELECTRICAL WIRING Failure to follow these guidelines and procedures invalidates DS warranty The shaft critical speed occurs above the maximum operating speed and allows for the added weight of shaft coupling Compare half coupling weight with maximum weight limits of operating speed used Refer to outline dimension drawing for maximum operating speeds that are proportional to half coupling weight Refer to specific model Data Sheet in the Records Manual for maximum overhung load at maximum speed Electrical wiring is required for the field coil s support equipment and safety interlocks wiring must conform to National Electric Code and local regulations Check nameplates on equipment to ensure connections are to proper volt
26. a given torque the equivalent power may be calculated The standard equation relating torque in foot pounds rotational speed in RPM and horsepower is Torque HP x 5252 RPM HP z Torque x RPM 5252 VIBRATION Vibration is measured with an accelerometer and vibration meter and measured in velocity inches per second Vibration V in sec Velocity inches per second Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS Appendix A 49 DPD 002 04 Copyright Dyne Systems Inc APPENDIX ACRONYMS C Degrees Centigrade DG Dry Gap DUT Device Under Test F Degrees Fahrenheit Gallons per Minute HP Horsepower ID Inside Diameter OD Outside Diameter OEM Original Equipment Manufacturer NIST National Institute of Standards and Testing N C Normally Closed Contact N O Normally Open Contact pH Power of Hydrogen PPM Parts per Million PSI Pound per Square Inch RPM Revolutions per Minute RTD Resistant Temperature Device Total Indicator Reading WIG Wet in the Gap 50 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS Appendix B DPD 002 04 Copyright Dyne Systems Inc
27. ag Power Figure 2 2 Typical Eddy Current Speed Torque Cuver Midwest and Dynamatic dynamometers are designed with a smooth rotor and a toothed stator inductor drum refer to Figure 2 3 or a toothed rotor and a smooth stator inductor rings refer to Figure 2 4 For the purpose of explaining Eddy Current Theory the more common utilized design of a toothed rotor and smooth stator will be used However the same principals apply using the converse design The development of torque in the eddy current dynamometer takes place in the following manner Energizing the eddy current field sets up a magnetic field in the inductor ring and a magnetic field in the rotor The tapered teeth on the rotor sweep the inner surface of the inductor ring Any point on the inside diameter surface of the inductor ring is subjected to influx penetration which will vary in intensity depending on whether a rotor tooth or space is adjacent to that point Rotation of the rotor therefore continually varies the flux density on the inside diameter surface of the inductor ring The varying flux intensity in the inductor ring develops eddy currents which flow near the inner diameter surface of the ring These eddy currents set up a magnetic field which reacts with the fields centered in the rotor teeth Reaction between the two sets of magnetic fields causes an attraction in tangential direction between the rotor and stator thereby developing a braking torque which is in
28. age and current sources Safety interlocks are vital to safe operation All signal wiring such as magnetic pickup encoders transducers and load cells must be run in conduit separate from power wiring All metallic conduit must be connected with threaded unions Conventional conductors of required amperage may be run in common conduits or raceways Exceptions are speed and torque feedback signals which are low level and must be wired in dedicated metallic conduits Magnetic pickup sensors must use two wire shielded cable grounded at the controller end only Load cells must use four wire shielded cable grounded at the controller end only Always disconnect electrical power before working on equipment Do NOT use eo high voltage to test or check installation Do NOT run shielded cable in conduits with power conductors COOLING SUPPLY AND MEDIUM Water is the primary medium used to cool dynamometers Depending upon the environment and or cooling system configuration some applications require a mixture of water and glycol or possibly a rust inhibitor If the cooling medium requires a mixture of the water and glycol it is critical to control the mixture ratio since the thermal transfer properties of glycol are not as efficient as those of water To maintain clarity throughout this manual COOLANT is used as a generic term for cooling medium e g water or water glycol mixture Dynamometers require coolant having a maximum temperature of 32 C
29. arred pounded or lifted by the shaft Small units may be transported by fork lift providing they are well supported without strain or danger of dropping Larger units provided with eyebolts lifting lugs or holes are designed for lifting by crane The weight capacity of crane cable and slings must be sized appropriately for the unit Attach crane cables to all lifting eyes provided using padding wherever the cable touches the unit Lift cables must only pull vertically on lifting eyes This can be achieved by use of a spreader or spreader frame Lifting eyes are designed for the weight of the unit alone including accessories mounted factory When the dynamometer is connected to other equipment do NOT lift the entire assembly from the lifting eyes on the dynamometer Units mounted on a common base can be lifted with a sling attached or hooked to eyebolts provided on base Follow all standard safety practices Training programs are an essential part of safe and correct operation Training provides the know how necessary to obtain top performance from your equipment DS recognizes this fact and will conduct training classes on site or at the factory to educate personnel in safe operating and maintenance procedures Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 1 General Info 7 DPD 002 04 Copyright Dyne Systems Inc WARRANTY VALIDATION In order to VALIDATE the WARRANTY for the Dynamometer the following requi
30. constant level oiling system This position must never be altered Pressurized Re Circulating Oil System 1 2 MONTHLY It should be between and 34 full Do NOT over fill Remove oil reservoir cap Fill to appropriate level using Exxon Nuto H 32 lubrication oil or other similar oil Replace oil reservoir cap Check coolant hoses for cracks Replace as required Check for coolant leaks Repair as required Check for oil leaks Repair as required Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 7 Maintenance 43 DPD 002 04 Copyright Dyne Systems Inc 3 1 Check Carcass Movement 1 Loosen or remove the anti rotation safety stop and disconnect the Load Measuring System from carcass Gently move the torque arm up and down to verify that the carcass moves freely in the trunnion bearings If the carcass does NOT move freely check for interference such as wires hoses brinelling of the trunnion bearings dry or hard trunnion bearing grease etc Reconnect the Load Measuring System to the carcass and tighten or reinstall the anti rotation safety stop 2 Rotate Trunnion Bearing Rotators Shift Rings if applicable 1 2 EVERY 6 MONTHS ANNUAL Disconnect the Load Measuring System from the Carcass Depending upon type of dynamometer loosen the screws of either the pedestal caps or enclosure top Rotate each 2 rotator about 15 by hand using a rod that fits in
31. d to protect the load cell from shock LOAD STRUT AND ROD ENDS A load strut with a rod end at each end connects the torque arm to the load cell to operate in tension or compression To level torque arm use the following procedure 1 Disconnect rod end fitting from torque arm 2 Adjust length of the load strut rod end assembly 3 Tighten jam nuts on rod end fittings and reconnect rod end to torque arm NOTE DS ships all dynamometers with the load cell disconnected from the torque arm Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 4 Check amp Adjust 29 DPD 002 04 Copyright Dyne Systems Inc WATER PURITY Failure to follow these guidelines and procedures invalidates DS warranty The pH should be between 7 0 and 7 8 Cooling water having a pH below 7 0 is too acidic and will cause premature rusting and will chemically attack the coil enclosure inductor drum without teeth or rotor with teeth and bearing seals When the water has a pH above 7 8 it contains too high a level of alkaline and will cause rapid scaling unless the water discharge temperature is reduced to a maximum of 50 C 122 F Dissolved solids consisting of carbonates sulfates and chlorides should be limited to a combined 400 parts per million refer to Table 4 1 When total solids are below this level the maximum temperature at which water can be discharged is 74 C 165 F If water solids carbonates sulfates and chlorides level exc
32. determined by the prime mover CONSTRUCTION The dynamometer is constructed of a carcass assembly supported by trunnion bearings in either a fabricated steel enclosure or on pedestals and a base Mounting the dynamometer carcass assembly on bearings allows the carcass to rotate freely limited by anti rotation safety stops Torque and calibration arms are mounted to either side of the stator housing at the centerline The dynamometer carcass consists of a rotor shaft assembly and a stator assembly The cast steel rotor can be either a tooth type or smooth surface type depending upon configuration The stator has multiple 2 7 cast steel housing sections which allow the installation or assembly of one or more coils 1 6 Machined inductor rings which carry the cooling media are pressed and welded into each stator half if applicable 8 1 Rotor i 1 2 Stator NI 5 3 Field Coil 10 s 0 4 Rotor Bearings 722 5 Trunnion Bearings fe 6 Shaft A E N 7 Trunnion A 8 Inductor Rings on K 1 9 Rotators Shift Rings 10 Trunnion Bearing Cover Figure 2 1 Typical Absorption Dynamometer Cross Section Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 2 Description DPD 002 04 Copyright Dyne Systems Inc CONSTRUCTION CONTINUED
33. ecommends that the complete system be trim balanced by an experienced professional if speed is greater than 3600 RPM Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 3 Install amp Setup DPD 002 04 Copyright Dyne Systems Inc ANGULAR MISALIGNMENT Failure to follow these guidelines and procedures invalidates DS warranty To check for angular misalignment mount a calibrated dial indicator to one coupling hub and indicate coupling hub face on the other Scribe a reference point on coupling hub where indicator finger or button is positioned Turn both shafts simultaneously 360 keeping indicator at the reference point Check indicator readout every quarter revolution If operating limits are given in degrees calculate angular displacement in inches with this formula Angle in Degrees 573 0 Where A largest reading B smallest reading D diameter at which the reading is taken PARALLEL OFFSET PARALLEL OFFSET AND ANGULAR Figure 3 1 Parallel and Angular Offset When OEM limits are unavailable we suggest 0 001 per inch of indicating distance to center of shaft For example align a 4 diameter shaft so angular displacement does not exceed 0 002 when the radius where reading is taken is 2 from shaft center Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 3 Install amp Setup 23 DPD 002 04 Copyright Dyne Systems Inc ALIGNMENT FOR SHAFT COUPLING CONTINUED OFF
34. eeds a combined 400 parts per million PPM reduce the drain temperature to 50 C to minimize scaling If excessive scaling persists water should be treated or deposits removed regularly Consult DS Service Department for proper descaling procedure Solids Recommended Maximum Values Total Carbonate 200 11 68 Table 4 1 30 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 4 Check amp Adjust DPD 002 04 Copyright Dyne Systems Inc AUTOMATIC PIPING COOLANT SYSTEM 1 Y Strainer 2 Solenoid Valve 3 Coolant Pressure Switch 4 Constant Flow Valve 5 Coolant Modulating Valve 6 Exit Coolant Temperature Switch 7 Coolant Flow Switch Y STRAINER A single automated coolant piping system is always furnished with WIG dynamometers and can be supplied with DG dynamometers on request This automatic system includes required valves and switches to control temperature pressure and coolant flow in accordance with the specific operating requirements If applicable refer to the provided Coolant Piping OEM literature for further information WATER INLET Figure 4 1 Automatic Coolant Piping System The Y Strainer is used to collect foreign materials from passing through the dynamometer To clean the strainer use the following procedure 1 Energize solenoid valve and allow coolant to flow though system for 30 minutes 2 Turn solenoid and coolant OFF 3 Remove strainer basket to determine amounts of fore
35. en gear tooth surface and magnetic pick up to 0 010 Slowly rotate the dynamometer shaft to check the spacing of the magnetic pickup across several points of the 60 tooth gear Adjust magnetic pick up for optimum location and tighten jam nuts If the air gap between the 60 tooth gear and the magnetic pickup varies more than 0 010 the gear runout is considered excessive and requires repair or replacement Figure 4 3 Diagram of Magnetic Pickup Assembly 36 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 4 Check amp Adjust DPD 002 04 Copyright Dyne Systems Inc SECTION 5 DEAD WEIGHT CALIBRATION Use the following procedure to calibrate the dynamometer torque measurement system refer to Figures 5 1 and 5 2 1 2 10 11 Attach calibration arms to pads at end of the torque and balance arms Place weight hanger assembly in V groove or knife edge of calibration arm Define direction of rotation of the dynamometer to determine which calibration arm to load Dual rotation requires calibration in both directions by applying weights to both arms Consult dynamometer controller manual for calibration procedure of the torque measurement system and display NOTE Calibration Procedure may vary depending upon dynamometer controller being used Determine the torque arm length stamped on dynamometer nameplate Determine the calibration arm length stamped on dynamometer nameplate Determine the
36. er for such Products In no event will Dyne Systems be liable for any special incidental or consequential damages including loss of use loss of profit claims of third parties or damages arising from bodily injury or death however caused whether by the negligence of Dyne Systems or otherwise EQUIPMENT MADE BY OTHERS Any items supplied that are not manufactured by Dyne Systems are covered by the original manufacturer s warranty and not by a Dyne Systems warranty BUYER SUPPLIED PRODUCT Dyne Systems accepts Buyer provided equipment as a courtesy only Dyne Systems is not responsible for determining suitability of Buyer s equipment for a particular purpose Repair or configuration of Buyer supplied equipment will be charged at Dyne Systems normal rate 48 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 10 Warranty DPD 002 04 Copyright Dyne Systems Inc APPENDIX DEFINITIONS FORMULAS TORQUE Torque or moment of a force is a measure of the tendency of the force to rotate the body upon which it acts about an axis The magnitude of the moment due to a force acting ina plane perpendicular to some axis is obtained by multiplying the force by the perpendicular distance from the axis to the line of action of the force Just as a force is a push or a pull a torque can be thought of as a twist In more basic terms torque measures how hard something is rotated Any shaft that is being turned has a torque applied to it For
37. er to Section 5 Dead Weight Calibration ENCLOSURE SAFETY STOP CALIBRATION LOAD CELL WEIGHING SYSTEM PLATFORM ALIBRATION WEIGHTS Figure 2 7 Torque Measurement Calibration on Enclosure Type Dynamometer LUBRICATIO SYSTEM SAFETY STOP TORQUE ARI CALIBRATION ARM WEIGHT HANGER m E LOAD ut 2 4 Le WEIGHTS EMI 1 bei 2 Hd Figure 2 8 Torque Measurement Calibration on Pedestal Type Dynamometer Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 2 Description DPD 002 04 Copyright Dyne Systems Inc SECTION 3 INSTALLATION 8 SETUP Proper operation and long life of the dynamometer depend on its installation location and environment These instructions are only a guide for safe and proper installation and DO NOT cover all situations It is essential to refer questions on installation to DS LOCATION AND ENVIRONMENT SITE PREPARATION Be sure the dynamometer is installed within the following guidelines e Altitude Maximum of 1000 meters 3300 feet Ambient Temperature 10 C 40 C 50 F 104 F e Line Voltage Variation
38. f excessive dirt oil and other contamination that may work into the unit and cause a problem LUBRICATION Absorption dynamometers include two types of bearings trunnion and rotor Trunnion bearings are grease lubricated Rotor bearings are lubricated with either constant level oilers a pressurized re circulating oil system or grease Do NOT mix brands or types of lubricant unless manufacturer guarantees compatibility Excessive lubricant will cause bearings to overheat Trunnion Bearing Grease Unless specified otherwise trunnion bearing grease is general purpose industrial NLGI No 2 grade mineral oil with a lithium base Recommended trunnion bearing greases are listed in Table 7 1 Shell Alvania No 2 Table 7 1 Recommended Oil Specifications for Rotor Bearings Oil lubricated rotor bearings require a high grade mineral oil free from water sediment acid resin and other substances not derived from petroleum products and resistant to rust and oxidation Recommended oil specifications are listed in Table 7 2 according to operating temperature and rotating speed of bearings Also refer to drawings and contract specifications Under 2000 RPM 2000 to 6000 RPM Over 6000 RPM to 4 C 0 to 40 F 160 200 120 160 92 100 182 4 to 38 C 40 to 100 F 200 320 160 200 120 160 38 to 66 C 100 to 150 F 320 540 200 320 160 200 Table 7 2 Oils Provided by Dyne Systems
39. gs and discharged To maintain clarity throughout this manual COOLANT is used as a generic term for cooling medium e g water or water glycol mixture A unit of this type is referred to as Dry Gap DG since the coolant does not enter the air gap of the absorbing section refer to Fiigure 2 5 WATER INLET WATER OUTLET Figure 2 5 Coolant Flow in Dry Gap Eddy Current Dynamometer To design greater thermal capacity or energy absorption capacity into a smaller physical size coolant is injected directly into the air gap of Wet In the Gap WIG machines refer to Figure 2 6 After cooling the inductor ring from the backside as in the DG dynamometer coolant enters the air gap at the center of the machine and flows outward through the air gap in both directions Coolant pressure produces an axial or outward velocity through the air gap Rotor rotation imparts a tangential velocity to the coolant The combined motion of the coolant and rotor result in the coolant traveling through the air gap in a corkscrew path encompassing the rotor and absorbing heat from the inductor rings and rotor This corkscrew motion of the coolant in a WIG dynamometer is extremely effective providing maximum horsepower dissipation in a given frame size Because the coolant is in direct contact with the inner parts of the machine precautio
40. hank you for purchasing this product from Dyne Systems Our staff is at your disposal should you need information or support that is not found in this manual Inc Midwest 6 Dynamatic Dynamometers CONTROLS DYNAMOMETERS SYSTEM INTEGRATION AND TEST CELL AUTOMATION Dyne Systems Inc W209 N17391 Industrial Drive Jackson Wisconsin 53037 Toll Free 800 657 0726 www dynesystems com Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS Introduction 1 DPD 002 04 Copyright Dyne Systems Inc 2 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS DPD 002 04 Copyright Dyne Systems Inc TABLE OF CONTENTS SECTION 1 GENERAL INFORMATION 6 6 RECEIVING a nobel id 6 DAMAGE CLAIMS wo 7 IDENTIFY YOUR 7 7 TRAINING X M 7 WARRANTY TIN 8 SECTION 2 PRODUCT DESCRIPTION 9 PRINCIPLE OF OPERATION 9 CONSTRUCTION eet CCS 9 Ez ccm p 10 EDDY CURRENT 11 LE 13 13 WET GAP I MALE E 18 COOLING SYS ze 14 15 SAFETY DEVICES 15 SPEED WEA SURE i 15 STATIC TORQUE TEST ROTOR 15 TORQUE MEASUREMENT 16 3 INSTALLATION amp SETUP 17 LOCATION AND ENVMISONIMEBUIT 17
41. ign material present Some models have numerous strainers locate and check all strainers New installations generally have considerable foreign material 4 Clean strainer and repeat this procedure until filter remains clean or flush out piping and recheck To function properly the Y Strainer must be mounted horizontally DPD 002 04 Copyright Dyne Systems Inc Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 4 Check amp Adjust SOLENOID VALVE The Solenoid Valve is an electrically operated device used to turn coolant off when the dynamometer is not in use To check the solenoid valve energize the solenoid to ensure proper valve operation and On Off control COOLANT PRESSURE SWITCH Failure to follow these guidelines and procedures invalidates the DS warranty To safeguard against coolant failure a Coolant Pressure Switch is connected to inlet coolant piping with switch terminals connected in controller circuit If properly configured with the dynamometer controller a coolant failure low coolant pressure will shut down the dynamometer controller To check the pressure switch use the following procedure 1 2 10 CONSTANT FLOW VALVE If required install a pressure gauge in inlet piping if not included in system Make sure electrical power is turned OFF Disconnect wires to pressure switch at the terminal in junction box Using an ohmmeter check switch operation Turn coolant ON to ENERG
42. ing a 60 tooth gear and a zero velocity magnetic pickup all mounted as an integral part of the basic mechanical unit Speed readout can be provided as digital and or analog STATIC TORQUE TEST ROTOR LOCK A manually set locking collar which ties the rotor solidly to the stator or casing can be added to most dynamometers to allow for static torque testing Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 2 Description 15 DPD 002 04 Copyright Dyne Systems Inc TORQUE MEASUREMENT A torque arm is connected to the dynamometer carcass Rod end fittings and strut connect the torque arm to an electronic load cell On an enclosure type dynamometer refer to Figure 2 7 the load cell is mounted to a bracket that is attached to the dynamometer platform on the side of the enclosure On a pedestal type dynamometer refer to Figure 2 8 the load cell is mounted to a clevis that is attached to the dynamometer base The load cell linkage is positioned upright to the neutral position of the torque arm The load cell functions in compression or tension as required for clockwise and counterclockwise rotation Safety stops located above and below the torque arm limit stator movement but are not intended to protect the load cell from shock loads One end of the torque arm and balance arm are flat to attach the calibration arms Calibration weights and a hanger assembly are used for calibration of the load cell by the dead weight method ref
43. ing system is fabricated and assembled at the factory The load strut is disconnected to avoid damage during shipping It is only necessary to re install the load strut and level the torque arm If required refer to the provided Load Measuring System OEM literature for further information Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 3 Install amp Setup 27 DPD 002 04 Copyright Dyne Systems Inc SECTION 4 CHECKS AND ADJUSTMENTS Proper and safe operation of the dynamometer depends on correct installation functioning support items and connected safety interlocks These instructions give the maintenance and operating personnel a set of guidelines and procedures Only qualified maintenance and operating personnel under competent supervision should attempt operation of this unit The instructions do NOT cover all contingencies that may arise Refer questions to DS Service Department ELECTRICAL WIRING Continuity Test 1 Turn OFF power to the dynamometer 2 Using an ohmmeter check the continuity of interconnections of the Pressure Switch Temperature Switch and Coil Resistance Insulation Resistance Test Megger 1 Turn OFF power to the dynamometer 2 Disconnect coil leads note connection points 3 Follow the OEM Test Equipment instructions to measure the insulation resistance of the coil It should be above 100 meg ohms To get accurate results use a micro ohmmeter 4 Reconnect coil leads Be sure to con
44. ir location A slope drop of inch per foot is the minimum requirement UNIT PREPARATION Transport equipment to job site using accepted procedures Refer to Section 1 Handling for further information After unit has reached room temperature remove packing material temporary screens cover plates tie down bolts and banding NOTE Review application requirements and nameplate to ensure that correct unit is installed and voltage and current requirements match Examine unit for damage and missing accessories The following are suggested checks 1 Turn shaft by hand to determine binding or rubbing noises that may indicate rotor damage 2 Release safety stops and gently rock stator checking for roughness that may indicate trunnion bearing damage 3 Check openings for foreign material 4 Check junction boxes and electrical connections for continuity coil resistance and leakage to ground 5 Make sure connections are secure 6 If unit has been stored in a humid climate look for condensation and water damage 7 Make sure accessory equipment is complete and undamaged Movable devices should operate freely 18 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 3 Install amp Setup DPD 002 04 Copyright Dyne Systems Inc MOUNTING THE DYNAMOMETER Failure to follow these guidelines and procedures invalidates the DS warranty Horizontal units should be mounted directly to a steel bed plate or T slot base to e
45. m is being filled to avoid air being trapped in the system Air in the system reduces effectiveness of the cooling medium and may result in the dynamometer overheating and damaging the cooling rings and coil Consult the cooling system OEM for proper operation and maintenance procedures Excessive coolant pressure can flood the bearings or damage piping components or hoses resulting in premature wear on components LUBRICATION SYSTEMS Rotor bearings require continuous lubrication while the dynamometer is operating There are two types of lubrication systems either Constant Level Oilers or a Pressurized Re Circulating Oil System Constant level oilers are factory installed and adjusted for optimum performance When the oil level in the bearing chamber becomes low air seeps into the oiler reservoir and induces oil level in oiler and bearing chamber to rise until air is displaced by the oil The MINIMUM level of oil at which air is allowed to enter is marked at the factory as Oil Level Line The oiler must not be moved otherwise the bearing may receive an incorrect amount of oil Do NOT position oil supply line connected between oiler and bearing above oil level line Figure 3 2 illustrates a typical arrangement of an oiler connected to a rotor bearing If required refer to the provided Constant Oiler OEM literature for additional information Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 3 Install amp Setup 25 DPD 002 04
46. mponents Foundations must be level and sufficiently rigid to support the dynamometer and connected machinery The foundation size will be determined by underlying soil conditions size speed and weight of the equipment The foundation should extend beyond the machine outline at least six inches and reach down to a solid footing If inexperienced in foundation design consult a qualified civil structural engineer or contractor Be sure to allow for dynamometer drainage requirements when planning the foundation A steel bed plate or T slot base can be utilized to prevent the unit from being placed on concrete Level and grout the base plates with non shrink grouting before mounting unit Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 3 Install amp Setup 17 DPD 002 04 Copyright Dyne Systems Inc FOUNDATION AND MOUNTING CONTINUED When it is desirable to locate piping and conduit runs in the foundation locate and size them in accordance to DS approved drawings available upon request and local codes Be sure to allow concrete adequate cure time If the coolant drain piping is being installed in the foundation be sure to accommodate the cooling flow rate required by the dynamometer refer to Section 3 Cooling Supply and Piping Determine the drain requirements from DS approved drawings Always take pipe length into consideration and NEVER reduce the pipe dimensions given Determine the number of drains required and the
47. nect to the same points as originally found CARCASS MOVEMENT Check the carcass to determine if it moves freely using the flowing procedure 1 Loosen or remove anti rotation safety stop 2 Disconnect Load Measuring System from carcass 3 Gently move torque arm up and down to verify that carcass moves freely in trunnion bearings 4 Ifthe carcass does NOT move freely check for interference such as wires hoses brinelling of trunnion bearings dry or hard trunnion bearing grease etc 5 Once carcass moves freely rotate the trunnion bearings refer to Section 7 Maintenance Schedule Guidelines 6 Reconnect Load Measuring System to carcass Tighten or reinstall the anti rotation safety stop 28 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 4 Check amp Adjust DPD 002 04 Copyright Dyne Systems Inc ANTI ROTATION SAFETY STOP There are two different styled anti rotation safety stops depending upon whether it is a pedestal and base or enclosure type dynamometer Pedestal and Base 1 Check that the anti rotation bracket is mounted securely to the base and encompasses the torque arm 2 adjustment is required Enclosure Box 1 Center torque arm with respect to dynamometer housing 2 torque and balance arms should be horizontal 3 Adjust safety stop hex head screws for 1 8 inch clearance at top and bottom of torque arm and tighten jam nuts NOTE Safety stops are not intende
48. ns are taken to fully seal the field coil and the bearings from contact with the coolant With coolant in the air gap some hydraulic drag will be developed The magnitude of this drag depends on the quantity of the coolant flowing in the machine and the peripheral speed of the prime mover In the design of these dynamometers utmost care is exercised to allow free flow of the coolant Hydraulic drag aids the eddy current process in producing torque Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 2 Description 13 DPD 002 04 Copyright Dyne Systems Inc COOLING PRINCIPLES CONTINUED WATER INLET WATER INLET COOLING SYSTEM 2 t Figure 2 6 Coolant Flow in Wet Gap Eddy Current Dynamometer All dynamometers are equipped with a cooling system which regulates the amount of coolant to the dynamometer for cooling The cooling system consists of a modulating valve with its temperature sensor mounted in the drain box A by pass line around the modulating valve permits a pre determined minimum amount of coolant to flow through the dynamometer at all times As the temperature of the exit coolant in the drain box rises with the absorption of energy by the dynamometer the modulating value temperature sensor will cause the valve to open and allow increased coolant flow to the dynamometer
49. nsure rigidity Enclosure type dynamometers are self supporting but must be leveled secured and aligned Pedestal type dynamometers are NOT self supporting and must be mounted on a solid steel plate or T slot base and then leveled secured and aligned Units designed for horizontal mounting should NOT be mounted on an inclined plate unless they are designed for this purpose When placing unit on mounting base all foot pads must make contact Whenever possible connect the prime mover to the locked end of the shaft so axial movement due to thermal expansion will be away from the locked end The unit must be level and equally supported on all mounting pads to avoid binding or mechanical failure Use a feeler gauge between each pad and base to determine if shim stock is required before securing hold down bolts Cut a single shim of the thickness required and slot it to slide under pad with bolt in place Metal chips dirt or burrs on the shim will make a point contact that prevents proper alignment When the dynamometer is mounted on a base use a machinist s level to achieve precise level by shimming under the base foot pads If foot pads do not exist shim directly under the weight load which is typically directly under the pedestals Failure to properly level the base will result in misalignment between the rotating units It is not recommended to shim more than 1 8 Excessive shimming can cause increased vibration Dyne Systems WATER C
50. on such a checklist 1 Nameplate information 2 List of drawings 3 Speed Ranges 4 Load Ranges 5 Coil Ratings including voltage current and cold resistance 6 Water Service including normal drain temperature GPM required and pressure 7 Lubrication Service including type of grease type of oil viscosity 8 Service including type and pressure 9 Safety Settings including low coolant pressure high coolant temperature low oil pressure 10 Alignment Data including angular and parallel maximum limits 11 Vibration including normal readings 12 Service Record including date or maintenance cycle when above test points should be checked 13 Repair Record including date and description of problems versus items repaired or replaced During routine maintenance visually check for loose bolts missing shaft guards coolant or lubricant leaks and excessive dirt on cooling surfaces Question the operator to determine if abnormal conditions exist or a change in operation has been noted Compare operation of unit with its performance profile Investigate any changes noted on check list Carefully check air filters strainers and auxiliary support devices Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 7 Maintenance 41 DPD 002 04 Copyright Dyne Systems Inc CLEANING If filters or screens are plugged or dirty remove and clean them When they cannot be properly cleaned replace them Clean equipment o
51. port overloading promptly NORMAL OPERATION AND PERFORMANCE PROFILE Normal performance of the dynamometer within its load and speed ratings should compare favorably to the unit s performance profile Periodic test data should be recorded and compared with particular loads and speeds as a guideline for normal performance If a problem is detected compare it with previous data Dynamometers have a very long service life when given proper maintenance and operated within their design limits 40 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 6 Operation DPD 002 04 Copyright Dyne Systems Inc SECTION 7 CHECK LIST INSPECTION MAINTENANCE Service life of a dynamometer and the quality of test results depend on routine maintenance received during its lifetime Inadequate maintenance increases the probability of sudden and catastrophic failures Routine maintenance is the best assurance of trouble free operation The purpose of this Maintenance Section is to guide users in setting up a good maintenance program Although many factors affect the service life of any machine this manual cannot cover all contingencies but it can assist experienced maintenance personnel in maintaining the dynamometer in foreseen conditions Refer any questions to DS Service Department A checklist should be prepared which includes all maintenance check points pertaining to the equipment The following is a list of suggested items to be included
52. ride covered carrier if the unit is shipped without coverings check for moisture or foreign material especially in electrical windings around shafts and bearings 3 Turn shaft by hand to ensure it is free from binding and noise 4 Inspect housing to ensure there is no damage and that unit is intact 5 Check the shaft Total Indicator Reading TIR with a dial indicator If TIR exceeds 0 001 contact the factory Refer to Section 3 Shaft TIR Measurement Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 1 General Info DPD 002 04 Copyright Dyne Systems Inc DAMAGE CLAIMS In the event of damage report it without delay to the Carrier and DS DS s warranty policy does not cover shipping damage or lost material It is important to file a damage claim with the Carrier promptly If you require assistance in settling the claim contact DS Refer to equipment by purchase order Model and Serial number as shown on the nameplate of the unit involved IDENTIFY YOUR DYNAMOMETER HANDLING TRAINING Your dynamometer was manufactured at DS for your specific application Locate the model and serial numbers on the dynamometer nameplate and verify that they are the same as shown on the cover of this manual This information should be used when contacting DS customer support Only skilled personnel following standard safety practices should handle this equipment Do NOT overload lifting equipment The unit should NOT be dropped j
53. rs need to be shipped on an air ride truck The load cell MUST be disconnected and the carcass secured All coolant MUST be drained Accessory devices and small removable components can be repaired on site Magnetic pick ups load measuring system linkage coolant devices hoses and tubing generally are replaced rather than repaired Major repairs can be done on site depending on the nature of the repair and the support equipment and personnel locally available DPD 002 04 Copyright Dyne Systems Inc Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 9 Parts and Service SECTION 10 PRODUCT WARRANTY WARRANTY REMEDIES AND LIMITATIONS Dyne Systems warrants the following equipment will conform to published specifications and be free from faulty material or workmanship for the listed time period from date of shipment or onsite repair New Eddy Current Dynamometers 12 Months Remanufactured Eddy Current Dynamometers to OEM Specifications 12 Months Service Calls 3 Months Repaired Controls and Repaired Dynamometers 3 Months This warranty covers properly installed equipment used within specified limits and ambient conditions and is limited to repair or replacement of equipment proving defective at Dyne Systems For warranty to be valid Buyer must conform to Dyne Systems factory specifications If applicable terms of Warranty Validation and Delivery Certification must be met for warranty to be valid This warranty does not apply to e
54. sing on the coupling hub Press fit or interference fit coupling hubs should generally be heated to expand the coupling hub to slide on the shaft Contact the coupling hub manufacturer for temperature requirements Do NOT pound or drive the coupling hub onto the shaft This will cause bearing and or bearing cap damage If using coolant to cool shaft do NOT allow coolant to get into bearing or this will cause bearing damage Position the coupling hub properly on the shaft Consult drawings and instructions If a key is used in a coupling hub it should fit snugly in the shaft and coupling hub keyway slots and should NOT extend beyond the coupling hub or shaft in either direction Make sure there is clearance approximately 003 005 between the key and the inside keyway of the coupling hub shaft nut is used to secure the coupling hub make sure the coupling hub has been properly installed and tightened Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 3 Install amp Setup 21 DPD 002 04 Copyright Dyne Systems Inc ALIGNMENT FOR SHAFT COUPLING Iw Failure to follow these guidelines and procedures invalidates the DS warranty Alignment of the Device Under Test DUT to the dynamometer should be done by qualified personnel When coupling two shafts with a universal joint a slight misalignment of 0 5 between shafts is recommended However very accurate alignment between directly connected shafts is required
55. sites apply 1 10 11 12 13 The DYNAMOMETER BASE must be LEVEL and on an acceptable FOUNDATION See page 17 The SHAFT TIR must be measured and confirmed upon receipt If greater than 0 0017 please contact DS immediately See page 20 All Device Under Test Adapter Components must be BALANCED Drive Line Hubs Flywheel Adapters Half Keys etc See page 21 The SYSTEM dynamometer and Device Under Test must be in proper ALIGNMENT within the limits of the coupling and drive line manufacturer s specifications See page 22 The OVER HUNG WEIGHT LOAD must be within acceptable limits See page 24 The cooling water must have a pH level of 7 0 7 8 to avoid scaling buildup inside the dynamometer See page 30 The dynamometer must have a SAFETY SYSTEM installed and properly working to monitor COOLANT PRESSURE See page 32 The dynamometer must have a SAFETY SYSTEM installed and properly working to monitor EXIT COOLANT TEMPERATURE See page 34 The CONSTANT LEVEL OIL SYSTEM must be properly filled with oil if applicable See page 35 For HIGH SPEED DYNAMOMETERS it must have a SAFETY SYSTEM installed and properly working to monitor OIL PRESSURE See page 35 The dynamometer must not exceed the following vibration specifications See page 39 3600 RPM or less should not exceed 0 20 V in sec 3601 RPM or greater should not exceed 0 15 V in sec The complete system should be TRIM BALANCED by an experienced profe
56. ssional if the speed is greater than 3600 RPM The TRUNNION BEARING ROTATORS must have been rotated 90 after receipt if applicable See page 44 If a DRIVE LINE is being used it must have proper DAMPENING to minimize vibration and torque spikes Refer to drive line OEM for proper installation instructions If you have any questions or concerns regarding the any of above stated stipulations please refer to the contents of this Manual or contact DS Applications Engineering at 800 657 0726 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 1 General Info DPD 002 04 Copyright Dyne Systems Inc SECTION 2 PRODUCT DESCRIPTION Midwest and Dynamatic absorption dynamometers absorb power and accurately measure torque supplied by a prime mover The dynamometer can be electronically controlled to regulate speed or torque either dynamically or steady state PRINCIPLE OF OPERATION The absorption dynamometer is basically an eddy current brake mounted in trunnion bearings Energizing the electromagnetic brake develops retarding torque in the rotor anda reaction torque in the stator Reaction torque is measured by connecting a load cell measures force at a specific distance from the carcass centerline to the end of torque arm The force and distance provide torque information which when combined with speed data permit power calculations torque force x distance The unit will operate in clockwise or counterclockwise rotation
57. sure does not fall within this range adjust the by pass valve adjusting screw located on top of the lubricator Adjust screw counterclockwise to lower pressure Low Pressure Oil Switch Iw Failure to follow these guidelines and procedures invalidates the DS warranty A low pressure cut off switch included in the system and is set to trip on falling pressure at 6 8 PSI Check switch operation to determine if the contacts are wired into control circuit to shut down the prime mover if oil pressure fails Check the actual contact used to shut down the prime mover 1 Oncethe contact is monitored unscrew the lubricator by pass valve adjusting screw until the pressure drops to 6 PSI 2 The contact should open If not adjust the pressure switch by turning slotted adjusting screw until it trips 3 Increase pressure and repeat test until the contact observed trips at falling pressure of 6 8 PSI 4 Reset the operating pressure to 10 15 PSI range described under By Pass Adjustment paragraph above Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 4 Check amp Adjust 35 DPD 002 04 Copyright Dyne Systems Inc MAGNETIC PICK UP 1 Housing 2 Magnetic Pick up 3 Jam Nut 4 Spur Gear The Magnetic Pickup measures the speed using a 60 tooth gear To adjust the magnetic pickup use the following steps 1 2 Loosen jam nuts and screw magnetic pick up into hole provided Using a feeler gauge set clearance betwe
58. t It is factory set to open at 43 C 109 4 F at 35 PSI coolant pressure If the valve does not respond adjust temperature setting by turning large threaded adjusting nut Turn the nut clockwise to increase temperature setting and counterclockwise to decrease temperature setting Final adjustments are made with bulb inserted in sump and dynamometer operating Monitor discharge temperature and adjust valve to regulate temperature at 55 C 131 F Reduce drain temperature to 40 45 C 104 113 F for water containing high mineral content or pH over 78 BELLOWS a E SPRING e CAPILLARY CO mwene 0 L il i d I Thermally Ga Responsive Fluid om VAPOR Ga ER eh Temp Temp Below Above Set Point Set Point Thermally mim 9 Responsive Fluid VALVE PLUG SoA Sogn DIRECT ACTING VALVE PLUG SEATS VALVE PLUG SEATS A VALVE PLUG REVERSE ACTING C Figure 4 2 Typical Modulating Valve Drawing courtesy of Powers Controls Inc Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 4 Check amp Adjust 33 DPD 002 04 Copyright Dyne Systems Inc EXIT COOLANT TEMPERATURE SWITCH Failure to follow these guidelines and procedures invalidates the DS warranty
59. the coolant flow at the required level Set the flow switch to close by turning the adjustment screw Reduce the coolant flow The flow switch should open 34 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 4 Check amp Adjust DPD 002 04 Copyright Dyne Systems Inc CONSTANT LEVEL OILERS Failure to follow these guidelines and procedures invalidates the DS warranty Standard speed dynamometers use constant level oilers to lubricate the rotor bearings Prior to operation make sure system is properly filled with oil Fill reservoir with a high grade mineral oil free from water sediment acid resin and other substances not derived from petroleum products The oil should be resistant to rust oxidation gumming and evaporation Refer to Section 7 Lubrication PRESSURIZED RE CIRCULATING OIL SYSTEM High speed and some special dynamometers have a pressurized re circulating oil system Fill reservoir with a high grade mineral oil free of water sediment resin and other substances not derived from petroleum products The oil should be resistant to rust oxidation gumming and evaporation Refer to Section 7 Lubrication NOTE The system is designed for a specific lubricant viscosity Changing lubricants will affect the amount of oil fed to each bearing By Pass Adjustment When the system is in operation observe the oil pressure gauge mounted on the dynamometer frame The operating pressure should be 10 15 PSI If pres
60. to the machined holes of the rotators refer to Figure 2 1 Gently move the carcass by hand It should move freely without binding or restriction If the carcass does NOT move freely check for interference such as wires hoses brinelling of trunnion bearings dry or hard trunnion bearing grease etc Securely tighten the screws on either the pedestal caps or enclosure top Check TIR of the shaft It should not exceed 0 001 Make sure the coolant pressure gauge is functioning properly Make sure the exit coolant temperature switch is functioning properly Remove temperature sensor and check with calibrated thermometer using water Check the Y Strainer filter if applicable and clean if needed For pressurized re circulating oil system check filters and screens and replace them if they cannot be cleaned Make sure the solenoid valve is functioning properly For pressurized re circulating oil systems drain clean and change oil Check the trunnion bearings to make sure grease is not dry or hardened If required repack with fresh grease or replace bearings Check vibration using an Accelerometer 3600 RPM and less should not exceed 0 20 V in sec e 3601 RPM and greater should not exceed 0 15 V in sec 44 Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 7 Maintenance DPD 002 04 Copyright Dyne Systems Inc STORAGE 12 Months or Less Greater Than 12 Months Store in clean dry area within the following
61. uaker Ferrocote No 5684 If constant level oilers are used drain oil from the system refill with anti rust oil mixture Elevate oiler to ensure oil flow into bearing cavities Relocate oiler in proper position and turn shaft by hand to coat bearings On a monthly basis rotate shaft by hand to lubricate bearings and alternate shaft position to prevent brinelling If a pressurized re circulating oil system is used drain oil from system refill with anti rust oil mixture described above Connect circulating pump to proper electrical service and run pump for minimum of two hours On a monthly basis rotate the shaft by hand to lubricate bearings and alternate shaft position to prevent brinelling Greased lubricated trunnion and rotor bearings should be hand rotated and repositioned monthly to redistribute bearing grease and to prevent brinelling When placing dynamometer back into service drain anti rust oil mixture from oil piping system and replace with recommended oils See Tables 7 2 and 7 3 Inspect grease lubricated trunnion and rotor bearings and repack with recommended grease refer to Table 7 1 If using a closed loop cooling system flush the dynamometer prior to putting it back into operation Dyne Systems WATER COOLED EDDY CURRENT DYNAMOMETERS 7 Maintenance 45 DPD 002 04 Copyright Dyne Systems Inc SECTION 8 TROUBLESHOOTING The possibility of a component failure or other problems always exists This section
62. xperimental developmental or non standards Goods and Products which are sold as 15 where is Dyne Systems shall not be liable for labor costs associated with removing reinstalling or delivering any equipment Transportation costs associated with delivering products to Dyne Systems under the warranty are the responsibility of the Buyer Transportation costs associated with returning products to the Buyer under the warranty are the responsibility of Dyne Systems If warranty service is deemed necessary and product i e controls small dynamometer etc can be shipped to Dyne Systems then it is expected that product be sent to Dyne Systems however if Buyer wants warranty work to be performed onsite and Dyne Systems deems it feasible then Buyer will be responsible for travel hours and travel transportation costs Dyne Systems is not liable for costs incurred such as loss of work time or production time or for loss of profits or other damages including but not limited to consequential damage THE FOREGOING WARRANTIES ARE EXCLUSIVE AND ARE GIVEN AND ACCEPTED IN LIEU OF ANY AND ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE THE REMEDIES OF BUYER FOR ANY BREACH OF WARRANTY SHALL BE LIMITED TO THOSE PROVIDED HEREIN AND FOR DELAY OR NON DELIVERY WHICH IS NOT EXCUSABLE TO THE PURCHASE PRICE OF THE GOODS IN RESPECT OF WHICH THE DELAY OR NON DELIVERY

Eddy Current Dynamometer Operator`s Manual

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