models cm2 and cm4 interface modules user`s manual
Contents
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5. 7 10 15 Auxiliary AUX Connector Flow SignalCommon 1 Flow Signal Output 2 __ Flow Signal Common Flow Signal Output Flow Signal Common Flow Signal Output ___ 6 O CERTIFICATE OF WARRANTY POLICIES PRICES CANCELLATIONS All prices are F O B Hatfield PA and subject to No cancellations will be accepted on non standard or change without notice All merchandise will be special merchandise except by payment of full invoiced at prices in effect at time of shipment Prices purchase price If buyer requests cancellation of any do not include insurance freight taxes or special order or part thereof and is agreed to by Porter handling These charges if applicable will be shown Instrument Division in writing buyer will be subject to separately on invoice Minimum order 30 00 cancellation charges to cover the cost of material and or fabrication incurred by Porter Instrument PAYMENT TERMS Division to date of cancellation Net 30 days after invoice date All invoices past due CHANGES OF ORDER are subject to a finance charge of 112 per month 18 annual rate A minimum of 90 days notice is required on all changes to orders and will be subject to rescheduling SHIPMENTS as a new order at Porter Instrument Division s Shipment of merchandise shall at times be subject to discretion credit approval and will be contingent upon fires RETURNS accidents emergencies acts of God or any ot
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8. position two 2 pole rotary switch which establishes a two 2 column binary code 2 and 2 to program the appropriate coding inputs on IC U1 and U2 of the Signal Conditioning Module FLOW SETPOINT push button switch selects flow signals binary 1 in the 27 column setpoint levels binary 0 in the 2 column Setpoint potentiometers are ten 10 turn controls which provide a continuous 0 to 5 120 Vdc level to the inputs of IC U1 noted above as well as the field located MFC s Keep in mind the 5 120 Vdc divided down 5 1 equals 1 024 Vdc which in turn equals a displayed value of 102 4 on the digital panel meter Refer to the theory discussion on the Signal Conditioning Module for further details OPERATION OF EQUIPMENT FIGURE 1 FRONT PANEL MODEL CM4 SHOWN Digital Panel Meter SETPOINT Controls CHANNEL SELECTOR Switch FLOW SETPOINT Switch ON OFF AUX I O Connectors Switch Fuse Connector 144 193 192 191 195 a v REF FORLI 7 z 2 5 4 SW3 5 2 Slide Switches FIGURE 2 BACK PANEL MODEL CM4 SHOWN 6 OPERATION OF EQUIPMENT GENERAL INFORMATION As previously mentioned Models CM2 and CM4 are used to provide a digital display of flow signals for Porter Instrument Series 100 or to provide a digital display for both flow signal
9. CH1 and Channel 1 s SETPOINT control adjusted fully clockwise depress the FLOW SETPOINT push button switch and maintain depressed 3 Adjust the 5 calibration potentiometer R14 located to the right of the display digits until the meter indicates 102 4 4 Replace filter bezel EQUIPMENT CALIBRATION This procedure should not be necessary but may be conducted if there is reason to believe the equipment is or may be out of calibration Calibration of Model CM2 CM4 simply means adjusting the 5 120 Vdc reference supply for 5 120 Vdc 002 Vdc Proceed as follows 1 Remove upper cover of the enclosure housing 2 Connect A C power cord and turn unit 3 Locate the Channel 15 SETPOINT control on the back of the front panel module Using 4 digit 05 accurate digital voltmeter connect the positive red test probe to terminal lug 3 of the setpoint control and the negative black test probe to terminal lug 1 of the setpoint control 4 Locate potentiometer R4 on the L shaped power supply module refer to Power Supply P C Board Assembly drawing KB20001 Adjust potentiometer R4 until the voltmeter reads 5 120 002 Vdc 5 Perform Verification of Calibration and Digital Panel Meter Adjustment Calibration is now complete OPERATION OF EQUIPMENT TABLE 3 REAR PANEL CONNECTORS PIN FUNCTION Connector and CH2 Model CM2 Connector 2 CH3 and CH4 Model CM4
10. Model CM4 only and Model CM4 only on rear panel setpoints 1 setpoint potentiometer channel adjustable from 0 to 102 4 F S with ten 10 turn control Display Red digit 0 56 in high digital panel meter with 0 1 resolution Auxiliary AUX Outputs Available for each channel at rear panel via 25 pin D type AUX connector for remote output signal use Automatic Proportional Tracking APT Control Control switches located on rear panel permit fixed internal reference for setpoint channels or selected flow signal references for all setpoint channels except Channel 1 Power Requirements 117 Vac 10 50 to 60 Hz 50 watts max Line fuse rear panel is rated at 0 5A Slo Blo Housing Style Table top mounting Dimensions 8 1 2 W x 4 7 8 H x 9 3 4 D Weight Model 2 6 lbs Model 6 Ibs GENERAL INFORMATION Flow signals from individual MFM s and or MFC s are processed by Model CM2 CM4 for digital display of flow rates in percentage of full scale if user selected APT operation of Model CM2 CM4 also provides a setpoint source required for MFC s These functions are accomplished by four 4 modular circuit assemblies These modules are designated as follows 1 Power Supply Module 2 Signal Conditioning Module 3 Interconnect Module includes interconnect PC board rear panel and rear panel componen
11. C U1 s C B and A code input will be 100 meaning the first flow signal and its common return being selected By depressing the FLOW SETPOINT switch the code now becomes 000 causing the first setpoint to be selected In other words changing the binary 2 weighting column Code 1 to 0 switches the digital panel meter s display from flow signals to setpoint signals The 5 maximum flow signal at the output of unity gain buffer is divided down to a 1 maximum signal by resistors R3 and The common return line reference level for the flow signal is fed from unity gain buffer U3B to a resistor network consisting of R1 R2 and zero control R6 This control R6 adjusts the common return line level to exactly zero 0 volts with no flow signal applied Signals present between the two output lines are applied to the digital panel meter via connector 2 4 Operational amplifier U3C serves inverting amplifier with a gain of X1 to convert its 5 12 Vdc input signal to a 5 12 Vdc output level Both polarities of 5 12 Vdc are required for zero control R6 Operational amplifier U3D is connected as a unity gain buffer to apply a 12 Vdc level divided down from 15 Vdc by resistors R5 and RN3 8 to CMOS multiplexers U1 and U2 as Vcc Connector 2J2 applies to the various power supply voltages to the signal conditioning PC board which are carried thro
12. MODELS CM2 AND CM4 INTERFACE MODULES USER S MANUAL MODEL CM2 MODEL CM4 Parker Hannifin Corporation Porter Instrument Division 245 Township Line Rd PORTER 7 Hatfield PA 19440 0907 USA 215 723 4000 fax 215 723 2199 FM 264 Rev 8 07 5 PRODUCT 2 nS 81 081 2 THEORY OF OPERATION a 3 GSMS cake O 3 SUDDIV 3 Signal Conditioning 3 LEK 5 5 7 7 7 9 evel 7 8 Dig
13. Model 1 1 through 1J4 individual channel input output connectors located on the rear panel are designated CH1 CH2 CH3 Model CM4 only and CH4 Model CM4 only The individual channel input output connectors connect to the previously mentioned 26 pin connector 1J6 via PC foils on the Interconnect PC board The 15 and 15 Vdc supplies along with the 5 120 Vdc reference voltage enter the Interconnect PC board via connector 1J7 and exit via connectors 1J1 1J2 1J3 Model only and 1J4 Model CM4 only Connector 195 is designated AUX and is mounted on the rear panel It supplies 0 to 5 flow signals to external meters recorders etc when required The last items to be noted here are the ON OFF power switch and power line FUSE also located on the rear panel Note theory of special control applications should be discussed with Porter Instrument s technical personnel FRONT PANEL MODULE Refer to schematic KB19705 The digital panel meter CHANNEL SELECTOR switch FLOW SETPOINT switch and SETPOINT controls CH1 amp CH2 Model CM2 CH1 through CH4 Model CM4 along with their respective cable connector assemblies make up the Front Panel Module The actual range of the digital panel meter is 0 to 1 999 Shifting the decimal point two 2 places to the right enables the meter to read 100 0 for a 1 000 Vdc flow signal input The CHANNEL SELECTOR switch is a four 4
14. U1 and U2 is defined in Table 1 Keep in mind that switching code inputs C B and A pins 9 10 and 11 relate to binary weighting columns 27 2 and 2 respectively Also remember the code input on IC U2 pin 9 is connected directly to ground and is the only input which 16 switched Examples of flow and setpoint selection are given following Table 1 TABLE 1 SWITCHING CODE FOR MULTIPLEXERS U1 U2 Channel Binary Code IC Input No C B A Pin Selected Setpoint and Flow Signal Common Assume a binary code of 110 is applied to the control input of U1 Since 9 is grounded U2 its C B and A code inputs would read 010 This means channel 3 s flow signal and common return line are switched through to operational amplifier buffers LM324 respectively Also note the control inputs for U1 and U2 which are not held low zero volts by the front panel CHANNEL SELECTOR switch connected 246 are pulled high to Vcc 12 by resistors 1 3 2 RN3 3 Depressing the FLOW SETPOINT switch on the front panel activates via pin 9 on U1 the second 279 group of signal levels applied to U1 s inputs namely the setpoint signals The CHANNEL SELECTOR switch programs the channel desired to be displayed on the digital panel meter For example with the FLOW SETPOINT switch not depressed and the CHANNEL SELECTOR switch set to CH1 I
15. channels and likewise has a setpoint control for each channel Process flow rates for all channels are displayed on a large bright red digital panel meter as a percentage of full scale F S The range of this meter is from 000 0 to 102 4 percent Setpoints for any channel also be displayed on the digital panel meter in the same percentage of full scale flow units Setpoints are adjustable to any value in the previously stated range using the ten 10 turn adjustment controls Control action occurs when the process flow value in a given channel matches its respective setpoint Both models also feature Automatic Proportional Tracking APT Mode operation APT operation permits setting the flow rate control in one or more channels to be a fixed ratio of the flow rate control reference channel regardless of the process flow rate reference channel Models CM2 are completely contained with internal modular construction Although they are multi featured instruments their operation is extremely simple Function Processes 0 to 5 Vdc flow signal inputs from Series 100 MFM s and Series 200 MFC s to provide readout in percentage of full scale F S flow For Series 200 MFC s provides 0 to 5 Vdc setpoint control outputs Inputs Model CM2 Two 2 channels Model CM4 Four 4 channels Inputs flow signal line plus common enter instrument 15 pin D type connectors CH1 CH2 CH3
16. eeding with repair or replacement Repaired equipment will be warranted ninety 90 days from date of delivery to the customer or for the balance of the original warranty whichever is longer Failures due to shipping damage accident misuse improper mechanical or electrical installation or operation or internal clogging or corrosion due to use of contaminated fluids or inadequate system purging are excluded from warranty coverage Parker Hannifin Corporation s obligation for breach of this warranty or for negligence or otherwise shall be strictly and exclusively limited to the repair or replacement of the equipment This warranty shall be void as to any equipment on which the serial number if applicable has been altered defaced or removed Parker Hannifin Corporation shall under no circumstances be liable for incidental or consequential damages No other promise or statement about the equipment by any representative or authorized dealer of Parker Hannifin Corporation shall constitute a warranty by Parker Hannifin Corporation or give rise to any liability or obligation of Parker Hannifin Corporation 10 wn ee Wid 5 11 OO LZ GH ind HI NOD 804 8 2 20078 AGL AGE LAY ab EJ A
17. f full scale flow Channel 2 s SETPOINT Control is adjusted to 80 0 percent of Channel 1 s controlled flow This means Channel 2 s flow rate should be controlled at 40 percent of full scale flow In addition for Model Channel 4 can track Channel 3 in the same manner The major advantage of APT Mode operation in this case is even if the flow rate in Channel 1 falls below its control limits Channel 2 s flow rate will remain a fixed ratio or proportion 80 percent of Channel 1 s flow rate VERIFICATION OF CALIBRATION Both Models CM2 and CM4 are shipped precisely calibrated and ready to use needed the calibration can be confirmed using the digital panel meter Proceed as follows 1 Set the CHANNEL SELECTOR switch to CH1 2 Rotate Channel 1 s SETPOINT control fully clockwise 3 Press the FLOW SETPOINT push button switch The digital panel meter should display 102 4 percent DIGITAL PANEL METER ADJUSTMENT If the digital panel meter reading obtained in the procedure above is not correct you may assume the meter has drifted slightly since the reference supply the basis for the equipment s calibration is considered extremely accurate and stable unless it is malfunctioning Therefore proceed as follows 1 Pop off the CM4 meter s red plastic filter oezel This can be done by placing a small thin screwdriver blade under the recess at the bottom center of the filter bezel 2 With CHANNEL SELECTOR switch set to
18. her causes which beyond Porter Instrument Division s No returns will be accepted unless authorized in control writing by Porter Instrument Division and accompanied by a properly completed Returned Goods Authorization All returns are subject to Specifications and dimensions subject to change restocking and possible rework charges to be determined by Porter Instrument Division CERTIFICATE OF WARRANTY THIS WARRANTY IS GIVEN IN PLACE OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE NO PROMISE OR STATEMENT MADE BY ANY REPRESENTATIVE OR AUTHORIZED DEALER OF PARKER HANNIFIN CORP SHALL CONSTITUTE A WARRANTY BY PARKER HANNIFIN CORP Parker Hannifin Corporation Porter Instrument Division warrants this equipment to be free from defects in workmanship and materials when used in accordance with applicable specifications and with appropriate maintenance for one 1 year from date of delivery to the customer unless otherwise specified in writing Equipment which malfunctions may be returned shipment prepaid to Parker Hannifin Corporation Porter Instrument Division for test and evaluation Equipment determined to be defective and in warranty will be repaired or replaced at no charge to the customer Equipment out of warranty will be evaluated and if the equipment does not meet original specifications and calibration the customer will be notified of the costs before proc
19. ital Panel Meter Adjustment 8 calibrat 8 POLICIES CERTIFICATE OF WARRANTY 10 FIGURES AND DRAWINGS Switching Code IC Multiplexers U1 U2 Table 1 4 Front Panel Model CM4 Shown Figure 1 6 Back Panel Model CM4 Shown Figure 2 6 Table 8 Rear Panel Connectors Pin Function Table 3 9 Power Supply Module Schematic Drawing 20000 11 Power Supply Board Assembly Drawing 20001 12 Signal Conditioning Module Schematic Drawing 19705 13 Interconnect Module Schematic Drawing 19704 14 Porter Interface Module CM2 and CM4 Interconnection Diagram Drawing 261 15 PRODUCT DESCRIPTION Porter s Interface Modules Models CM2 CM4 are designed for use with all Porter Instrument Series 100 Mass Flowmeters MFM s and Series 200 Mass Flow Controllers MFC s Model CM2 employs two 2 channels accepting flow signal inputs and providing setpoint control for each channel Model CM4 includes four 4 flow signal input
20. nce voltage 5 120 Vdc is LM317LZ Resistor R1 sets a value of current through R2 by virtue of the fixed voltage across it as established by the output terminals of U4 The total voltage across R1 and R2 is approximately 5 12 volts Adjustment potentiometer R4 and resistor R3 set the junction of R1 and R2 such that the final output voltage across the filter capacitor C8 is exactly 5 120 Vdc SIGNAL CONDITIONING MODULE Refer to schematic KB19705 The purpose of the Signal Conditioning Module is to multiplex switch up to four 4 input flow signals into a single 1 output meter signal Setpoint signal levels are also available at the of the multiplexer and may be selected for display on the digital panel meter Multiplexers 01 and U2 type 04051 electronically switch eight 8 analog signal inputs to a single 1 output A three 3 bit binary code applied to pins 9 through 11 determines which inputs are switched to the output Flow signals are applied to the first four 4 inputs of U1 The common return lines for these flow signals are applied to four 4 inputs on U2 The four 4 setpoint signal levels are applied to the second 279 set of on U1 They are also fed from this same location out to their respective MFC via connector 2J1 the interconnect PC board and channel input connectors 1J1 and 1J2 Model CM2 1J1 through 1J4 Model The binary switching code for the IC multiplexers
21. operation given in the third paragraph under the heading titled General Information on this page Position the selected NORM APT slide switch es so that the channel s which is are to follow track given reference channel is are set to the right side to the dotted line s Table 2 found on the following page indicates all APT combinations available The Back Panel pictorial representation located on the bottom of the previous page illustrates the NORM APT slide switches The important thing to remember when establishing APT Mode operation is to follow the dotted lines associated with the slide switches These lines indicate which channel is tracking particular reference channel Also note depressing the FLOW SETPOINT push button switch when the CHANNEL SELECTOR switch is set to display the channel using APT Mode operation will now make the meter display the adjusted ratio of the reference channel s flow signal That ratio is determined by the setting of the particular SETPOINT control switched into the APT Mode and will be read on the meter as a percentage of a percentage OPERATION OF EQUIPMENT TABLE 2 APT COMBINATIONS CM2 P 1 Independent Control 2 Automatic Proportional Tracking Example A Model 2 is being operated the APT Mode with Channel 2 Channel 1 Channel 1 s SETPOINT Control is adjusted to 50 0 percent o
22. s and setpoint controls for Porter Instrument Series 200 MFC s Control action of the Models CM2 and CM4 may take place in the Normal Mode or APT Mode Normal mode occurs when the setpoint control in each channel is connected to a precise and fixed internal reference voltage The SETPOINT control is then adjusted to a control point given as a percentage of full scale flow APT Mode occurs when one or more setpoint controls are connected not to internal reference voltage but to a selected channel s flow signal output This scheme permits automatic proportional blending of two 2 or more gases In other words if Channel 2 s setpoint control is connected to Channel 1 s flow signal output then Channel 2 s flow rate control becomes a fixed fractional ratio of Channel 1 s flow rate even if Channel 1 s flow rate falls below its control limits NORMAL MODE OPERATION Confirm the NORM APT slide switches on the rear panel are set to the left side to the solid line and reference arrows marked REF FOR INDEP CONT Set the CHANNEL SELECTOR switch to the desired channel and read the digital panel meter for the process flow signal s percentage of full scale flow Press the FLOW SETPOINT switch located on the front panel and adjust the appropriate SETPOINT control until the desired setpoint value is displayed on the digital panel meter APT MODE OPERATION Review the explanation offered for APT Automatic Proportional Tracking Mode
23. ts 4 Front Panel Module includes digital panel meter selector switches setpoint controls POWER SUPPLY MODULE Refer to schematic KB20000 The Power Supply Module is comprised of a PC board and L shaped chassis which mounts to the PC board and off board power transformer The power supply provides three regulated supplies 5 Vdc 15 and 15 Vdc plus a precise 5 120 Vdc reference supply They operate all functional circuitry within the Model CM2 CM4 The 5 Vdc supply is specifically intended to power the digital panel meter The 117 primary winding of power transformer X1 is fed from the power cord amp line fuse ON OFF switch and a pair of quick disconnect type connectors J3 1 to J3 2 The 5 Vdc three 3 terminal regulator U1 LM340 5 receives its applied voltage from full wave rectifier filter CR2 and C1 Capacitor C2 serves as a transient suppressor Regulators U2 and U3 LM340 and LM320 form the basis for the dual 15 and 15 Vdc power supplies The positively oriented rectifier diodes part of CR5 apply their full wave voltage to filter capacitor C3 Capacitor C6 acts to suppress transients Note that the negatively oriented rectifier diodes part of CR5 are the counterparts of those previously mentioned Likewise capacitors C4 and C5 in parallel plus C7 are the counterparts of C3 and respectively The regulator U4 used to develop the precise refere
24. ugh to connector 243 for application to field located and or MFC s INTERCONNECT MODULE Refer to schematic KB19704 All signals to and from the outside world are made via the Interconnect Module Therefore consider this module as an PC board with attached connectors and switches mounted to the back panel Two 2 Model CM2 or four 4 Model CM4 sets of input output signals are available on the 26 connector 1J6 Each set relates to a given channel They include 1 0 to 5 flow signal input 2 its common return 3 a setpoint signal output and 4 an auxiliary control input Also note one 1 slide switch Model CM2 SW1 or four 4 slide switches Model CM4 SW1 through SW4 present in the schematic and located on the back panel Further note that these switches allow the setpoint lines to be connected to the internal reference voltage 5 120 Vdc or to the output signal of channel 1 Models CM2 and CM4 or channel 3 Model CM4 only Channel 1 is always referenced to the internal 5 120 Vdc reference voltage The possible combinations for referencing are as follows CH2 to CH1 CH3 to CH1 CH4 to CH1 or CH4 to CH3 the possible combinations involving channels 3 and 4 CH3 and CH4 are available only with Model CM4 This arrangement relates to the APT mode control feature discussed in various sections of this user s manual The two 2 Model CM2 1J1 and 1J2 or four 4
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