- 1 - User`s Manual: Series 260A Model 260A Process
Contents
1. 1 High or Low LO Alarm action DIP Switch 52 Set S2 to C1 for Low alarm or set S2 to C2 for High alarm Refer to Drawing 4501 115 for a graphical representation of each Refer to table of Drawing 4501 115 for proper switch positions Deadband Hysteresis DIP Switch S1 positions 2 6 The deadband can be set to 0 5 1 2 4 8 or 16 percent of input span and must be configured when the alarm is going to be used in the Auto Reset Mode non latching Deadband is 0 5 with all switches OFF DIP Switch S1 positions 2 through 6 individually select 1 2 4 8 or 16 percent deadband If the alarm is configured for the Latching Mode configure the deadband for 0 5 Refer to table of Drawing 4501 115 for proper switch positions IMPORTANT Noise and or jitter on the input signal has the effect of reducing narrowing the instrument s deadband and may produce contact chatter To reduce this undesired effect increase the deadband setting Alarm Latch Enable DIP Switch S1 position 1 Set to OFF for Automatic Reset Non Latching or ON for Latching Refer to table of Drawing 4501 115 for proper switch positions Note The push button on the front of the module can also lockout the latch action by pushing down and turning this button to lock it in its depressed state Series 260A User s Manual Alarm Process Current Loop Powered 4 Important Mark the Alarm s Configuration on the calibration label located on the encl2. remove two screws securing it to the bottom of the enclosure After the enclosure is installed reinstall the alarm into the enclosure Position the unit at an angle that permits all wiring to be routed unobstructed through both ports Secure the alarm assembly to the enclosure using two screws Electrical Connections The wire size used to connect the unit to the control system is not critical All terminal strips can accommodate wire from 14 26 AWG Strip back wire insulation 1 4 inch on each lead before installing into the terminal block Input wiring may be shielded or unshielded twisted pair Since common mode voltages can exist on signal wiring adequate wire insulation should be used and proper wiring practices followed It is recommended that input wiring be separated from alarm contact wiring for safety as well as for low noise pickup 1 Input Connect input per connection diagram observe proper polarity Note Input Output circuits are isolated from each other allowing the output circuit to operate with common mode voltages up to 250V AC or 354V DC off ground ona continuous basis Power to operate the unit is derived from the input signal current no external power supply is required The alarm has an input voltage drop of 4 5V DC at 20mA Whena signal alarm is installed it is always important to consider the voltage drop or additional line resistance that will be placed in the system Any additional load tends to reduce t
3. mA DC SETPOINT ye SIMPLIFIED SCHEMATIC SERIES 26 A ee are IE HIGH ALARM HIGH LIMIT FAILSAFE NON LATCHING THRESHOLD MOMENTARY 5 DEADBAND brop ouT ___ _ _ NS DRAWING SHOWS LIMIT VALUE EXCEEDED TIME 15 L EXCEEDED LIMIT EXCEEDED LIMIT REMAINS EXCEEDED SIGNAL WITHIN LIMITS UNTIL TIME 30 LED ON LED T T T T T So 5 10 15 20 25 55 40 RELAY RELAY OFF RELAY gt B LOW ALARM LED OFF LED ON LED OFF FAILSAFE NON LATCHING LIMIT MOMENTARY EXCEEDED m amp DROP OUT 0 NNO NVALUE DRAWING SHOWS LIMIT i DEADBAND LIMIT EXCEEDED EXCEEDED AT TIME 15 LOW LIMIT SIGNAL WITHIN LIMITS LIMIT REMAINS EXCEEDED THRESHOLD UNTIL TIME 50 5 T 5 10 15 20 25 30 35 40 TIME T gt ALARM CONDITIONS NON LATCHING SWITCH 51 1 LATCH ENABLE SWITCH 52 HIGH LOW ALARM SELECTION SET TO ON TO ENABLE SET 52 TO C2 POSITION FOR HIGH ALARM LATCHED ALARMS SET 52 TO C1 POSITION FOR LOW ALARM SEE NOTE 2 SWITCH 51 POSITIONS 2 6 DEADBAND SET TO SELECT DEADBAND AS FOLLOWS SETPOINT NON LATCHING ALARMS ONLY SWITCH as og 2 1 2 3 4 5 6 LATCH RESET 5 oFF oF F LOCKOUT
4. provides a visual indication of the alarm condition The Alarm is RFl protected operates over a wide temperature range and features excellent temperature coefficients which minimize the effects from harsh plant environments See Drawing 4501 114 for a simplified schematic Series 260A User s Manual Alarm Process Current Loop Powered 260A Features Signal Loop Powered Alarm Status Indication 4 5V DC Fixed Voltage Requirement Multi turn Setpoint Adjustment 2 Amp 3A Max SPDT Contacts Adjustable Deadband Hysteresis HI LO Failsafe Alarm Action Wide Ambient Temperature Range Automatic or Manual Reset Mounting Configuration Versatility These field mounted loop powered alarms are designed to utilize one of a number of customer specified mounting configurations The alarm is available for DIN rail mounting surface mounting 3 inch SNAPTRACK plastic rail mounting or in various housings These housings include NEMA 4 12 and rugged instrument enclosures The model number of the unit specifies the mounting enclosure type refer to Table 1 Alarm input wiring is inserted in the top of the unit while output wiring is inserted in the bottom field side of the unit Screws to secure the wiring are located on the front panel Connectors are screw clamp type and accept wire size up to 14 AWG SPECIFICATIONS Function This two wire loop powered alarm accepts a 4 to 20 input signal and provides a failsafe complete
5. very slowly just until the relay changes states and the alarm LED turns ON The setpoint is calibrated Check your calibration as noted in step 4 below 4 For High Alarms check the setpoint by reducing the input current until the relay changes states and the alarm LED turns OFF Then slowly increase the input current until the alarm just trips LED turns ON The input current should be within 0 1 0 016mA of the desired trip point If not perform steps 1 through 3 again 5 Calibration is complete LOW ALARMS 1 Adjust the input current to the precise alarm current desired 2 For Low Alarms turn the setpoint pot counter clockwise until the relay changes states and the alarm LED turns OFF 3 Now turn the setpoint pot clockwise very slowly just until the relay changes states and the alarm LED turns ON The setpoint is calibrated Check your calibration as noted in step 4 below 4 For Low Alarms check the setpoint by raising the input current until the relay changes states and the alarm LED turns OFF Then slowly decrease the input current until the alarm just trips LED turns ON The input current should be within 0 1 0 016mA of the desired trip point If not perform steps 1 through 3 again 5 Calibration is complete GENERAL MAINTENANCE This alarm contains solid state components and requires no maintenance except for periodic cleaning and calibration verification When a failure is suspected a convenient meth
6. 40 OFF on OFF OFF 16 0 __ OFF oFF oFF OFF OFF ON DISASSEMBLY SEE NOTE 1 DIP SWITCH CONFIGURATION NOTE 1 REFER TO THE CALIBRATION SECTION OF THE Acromag MANUAL FOR DETALED INSTRUCTIONS SERIES 260A LOOP ALARM CONFIGURATION 2 DEADBAND SHOULD BE SET 5 FOR ME 260A LOOP ALARM CONFIGURATION LATCHING ALARMS 88 __ 1 1 94501 115 NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS WIRE INSERTION LOCATION 2 PLACES 6 RAIL DIN MOUNTING RAIL DIN MOUNTING SHOWN THIS SIDE SHOWN THIS SIDE DIN EN 50035 32mm DIN EN 50022 35mm 70 RAIL DIN MOUNTING SHOWN HERE DIN EN 50035 32mm RAIL DIN MOUNTING SHOWN HERE DIN EN 50022 35mm SCREWDRIVER SLOT FOR REMOVAL FROM RAIL 25 0 NOTE ADJACENT UNITS MOUNTED ON 1 0 INCH 25 4mm CENTERS ENCLOSURE DIMENSIONS DIN RAIL MOUNTING DIN OPTION Aeae mi 29 AJG ote 26 A HOUSING DIN WIXOM MICH NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS WIRE INSERTION LOCATION 2 PLACES 3 19 5 08 78 75 25 0 SLOTS 0 148 3 76 WIDE TO CLEAR 6 SCREWS 2 PLACES ENCLOSURE DIMENSIONS SURFACE MOUNTING 5 OPTION NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS SCREWDRIVER WIRE INSERTION 0 70 SLOT FOR LOCATION 2
7. Acromag 9 User s Manual Series 260A Model 260A Process Current Loop Powered Alarm Table of Contents Page Introduction LL 1 Description 0 L L LLL LL 1 Specifications LL 2 Installation 0 LLL 3 Calibration 0 L LL LLL 4 General Maintenance _ dd L LL L LL 5 List of Drawings Page Electrical Connections 4501 113 2 2 L 6 Calibration Connections amp Simplified Schematic 4501 7 114 Configuration DIP Switch Location 4501 115 22 8 Dimensions DIN Rail Mounting 4501 116 ____ 9 Dimensions Surface amp Snaptrack Mounting 4501 117 10 NEMA 4 amp 12 Enclosures 4501 118 222222 11 Instrument Housing With Without Window 4501 121 12 IMPORTANT SAFETY CONSIDERATIONS It is very important for the user to consider the possible adverse effects of power wiring component sensor or software failures in designing any type of control or monitoring system This is especially important where economic property loss or human life is involved It is important that the user employ satisfactory overall system design It is agreed between the Buyer and Acromag that this is the Buyer s responsibility Acromag Inc Tel 248 624 1541 30765 South Wixom Road FAX 248 624 9234 PO Box 437 Wixom Michigan 48393 7037 USA Copyright 1991 1994 Acromag Inc Printed in the USA Data and specifications are subject to change without notice 8500 289 B94F009 INTRODUCTION These instructions cover the model types listed
8. DIMENSIONS WITH DIN RAIL MOUNTING 1 Acromag fare rev mE 200 HOUSING DIN RAIL MOUNT D 200 1 1 954501 2211 NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS
9. P switches first remove the alarm from the installation Second open the plastic case to get access to the DIP switches Third configure the DIP switches as described in the DIP switch Configuration procedure below Fourth install the circuit board into the plastic enclosure as described in the Assembly Procedure Disassembly Procedure for the 260A Plastic Housing The plastic housing has no screws it snaps together A flat head screwdriver Acromag 5021 216 or equivalent is needed to pry the housing apart as described in the following steps CAUTION Do not push the screwdriver blade into the housing more than approximately 0 1 inches while prying it apart Handling of the printed circuit board should only be done at a static free workstation otherwise damage to the electronics could result 1 To begin disassembly refer to Drawing 4501 115 place the screwdriver at point A left side of the alarm While pressing the blade into the seam use a twisting motion to separate the sides slightly Repeat this operation at point B Now that the two pieces have been partially separated use the screwdriver blade to work the left side of the package loose by working around the alarm and carefully prying the sides further apart Repeat this action until it is easy to remove the left side from the plastic pins holding the pieces together Repeat this operation for the right side starting at points C and D DIP Switch Configuration
10. PLACES 17 78 REMOVAL 2 89 0 29 75 41 5 08 3 50 83 82 5 80 96 52 NOTE 1 PLASTIC RAIL ENCLOSURE DIMENSIONS RATED TO SNAPTRACK MOUNTING 1 OPTION 02 Acromag 257 av oC care HOUSING 5 5 OPTION 260a 1 1 4501 117 SERIES 260A ALARM SHOWN IN ENCLOSURE WITH COVER OPEN NOTE ROOM 15 AVAILABLE FOR A SECOND UNIT WITH THE SM SURFACE MOUNT OPTION ORDER SEPARATELY NOTE ALL DIMENSIONS ARE IN INCHES MILLIMETERS GROUND WIRE CONNECTION SEE NOTE 1 NOTES 1 THESE SPECIFIC CLAMPS ON NEMA 4 ENCLOSURES ONLY CONDUIT MOUNTING HOLES FITTINGS ARE CUSTOMER SUPPLIED 8 313 7 9 DIA HOLE 4 PLACES N4 amp N12 OPTION ENCLOSURE DIMENSIONS Acromag MICH m ENCLOSURE 4 amp N12 OPTION 2 250a 1 1 4501 118 4 NOTE PLASTIC ENCLOSURE SNAPS TOGETHER AT SEAMS WIRE INSERTION LOCATION 2 PLACES RAIL DIN MOUNTING RAIL DIN MOUNTING SHOWN THIS SIDE SHOWN THIS SIDE DIN EN 50035 32mm DIN EN 50022 35mm RAIL DIN MOUNTING SHOWN HERE DIN EN 50035 32mm RAIL DIN MOUNTING SHOWN HERE DIN EN 50022 35mm SCREWDRIVER SLOT FOR REMOVAL FROM RAIL NOTE ADJACENT UNITS CAN BE MOUNTED 1 0 INCH 25 4mm CENTERS ENCLOSURE
11. RE TRANSMITTER INSTALLATION MANUAL RESET LATCH MODE PUSH TO RESET OR PUSH AND TURN CLOCKWISE TO LOCK OUT CAN DISABLED VIA INTERNAL DIP SWITCH SEE NOTE 5 L E D ALARM STATUS INDICATOR je ee ee ee eee eee lt S P D T FORM CONTACTS NOTES 2 amp 3 RELAY CONTACTS RATED AT 2 28V DC OR 115 AC RESISTIVE N C NOTES 1 THE ALARM LED WILL LIGHT AS SOON AS THE INPUT EXCEEDS THE SETPOINT THE RELAY LED WHEN ON INDICATES RELAY COIL DE ENERGIZED FAILSAFE MODE 2 RELAY CONTACTS ARE SHOWN DE ENERGIZED OR ALARM CONDITION 3 ALARM CAN BE CONFIGURED AS A HIGH HI OR LO ALARM INTERNAL DIP SWITCH 4 DEADBAND HYSTERESIS CONFIGURED VIA INTERNAL DIP SWITCHES 5 MANUAL RESET LATCH MODE PREVENTS THE ALARM FROM RESETTING AUTOMATICALLY THEREBY PERMITTING THE USER TO RESET THE ALARM AS DESIRED lt LOOP ALARM CONNECTIONS D Tor 10 4501 114 SIMPLIFIED SCHEMATIC CURRENT SENSE RESISTOR DFADBAND HYSTERESIS OUTPUT INPUT CONTACTS SIGNAL AMPLIFIER COMPARATOR p 2 amp RELAY DRIVER 5 SEE note BELOW SETPOINT RELAY NT AMPLIFIER SETPOINT ADJUST NON LATCHING OR LATCHING RESET LATCHING FAILSAFE HI ALARM OR FAILSAFE LO ALARM NOTE RELAY CONTACTS ARE SHOWN SETPOINT VOLTAGE 0 2 TO 1 0 DC DE ENERGIZED OR ALARM POSITION ALARM TRIP POINT 4 0 2
12. atching Deadband 8 percent Output SPDT Relay Contacts A Setpoint Voltage Adjustment Method High amp Low Alarms 1 Measure the setpoint voltage at the terminals and adjust the setpoint potentiometer for 0 600V DC The alarm setpoint is fully adjustable from 4 to 24mA For most applications there is no need to simulate the trip point value to the 4 to 20mA input in order to calibrate the setpoint Simply measure the setpoint voltage between the SP and input terminals and adjust the 22 turn setpoint potentiometer until the desired value is reached Turn the setpoint pot clockwise to increase the setpoint counter clockwise to decrease the setpoint This signal is adjustable from 0 2V to 1 2VDC where 0 2VDC equals a 4mA trip point and 1 2V DC equals a 24mA trip point 1 0V DC is equal to 20mA Table 2 Setpoint Voltage vs Trip Point Input SETPOINT TERMINAL VOLTAGE VDC 0 200V 0 400V 0 600V 0 800V 1 000V 1 100V 1 200V 2 Setpoint calibration is complete B Input Current Method of Alarm Adjustment For tight control applications where precise alarm trip points are required proceed with the Input Current method of Setpoint Calibration given below HIGH ALARMS 1 Adjust the input current to the precise alarm current desired 2 For High Alarms turn the setpoint pot clockwise until the relay changes states and the alarm LED turns OFF 3 Now turn the setpoint pot counter clockwise
13. d General Purpose Housing SNAPTRACK Refer to Drawing 4501 117 for outline and clearance dimensions Shipping Weight 1 pound 0 45 Kg packed SNAPTRACK is a registered trademark of Reed Devices Inc NEMA 4 and 12 Enclosures Option types are listed below Refer to Drawing 4501 118 for outline and clearance dimensions Alarm is mounted within the enclosure at the factory These enclosures can also accommodate a second Series 260A Alarm with the surface mount option SM option ordered separately Conduit mounting holes and fittings are customer supplied N4 Water Tight Enclosure NEMA 4 Enclosure material and finish 0 075 and 0 060 inch thick steel with gray hammer tone enamel finish inside and out Shipping weight 6 pounds 2 7 Kg packed N12 Oil Tight Enclosure NEMA 12 Enclosure material and finish 0 075 amp 0 060 inch thick steel with gray hammer tone enamel finish inside and out Shipping weight 6 pounds 2 7 Kg packed Instrument Housing Water Tight Enclosures Option types listed below Refer to Drawing 4501 121 for outline and clearance dimensions Enclosure Materials Body and cover Copper free aluminum less than 0 4 Gasket Neoprene Finish Corro free epoxy powder coat color gray Hub size 0 75 inch Quantity 2 Alarm mounted in this housing is NOT explosion proof but it does meet NEMA 4 water tight requirements Alarm is mounted within enclosure at factory Instrument Housi
14. e represents the true trip point to within 0 5 of span By monitoring the input current and adjusting the setpoint pot the setpoint may be set to within 0 1 see Calibration section Deadband Adjust Hysteresis Field selectable Deadband 0 5 1 2 4 8 and 16 percent of span set via an internal DIP switch S1 positions 2 6 Refer to Drawing 4501 115 to adjust deadband OUTPUT SN Single Pole Double Throw SPDT Form C dry contact relay Isolated contacts rated at 2A Maximum 28VDC or 120V AC resistive Contact material fine Silver Breakdown Voltage 500V AC across contact gaps Life 1 Million operations at 1 amp 28V DC Operation failsafe coil normally energized de energizes on alarm Alarm LED The LED will be ON if the setpoint is exceeded relay not energized Alarm Action Failsafe High or Low Alarm Can be field configured to trip on increasing signal Failsafe HI Alarm or decreasing signal Failsafe LO Alarm via an internal DIP switch S2 Set S2 to C2 position for High Alarm or the C1 position for Low Alarm Refer to Drawing 4501 115 to adjust the alarm action Relay is normally energized and becomes de energized on alarm or signal failure Alarm Latch Automatic Reset Non Latching or Latching Latch action enabled via internal DIP switch S1 position 1 In the Non Latching mode the alarm will reset to its non alarm state as soon as the signal is outside of the selected deadband In t
15. he Latched mode the alarm will reset when the local Reset button labeled RST is pushed if the input signal is outside of the alarm region including the current deadband setting For this reason it is recommended that deadband be set to 0 5 for latching alarms Latch action can be locked out by pushing down and turning the Reset RST button 1 4 turn to lock it in its depressed state or via the on board DIP switch S1 position 1 Reference Test Conditions Input 4 to 20mA Setpoint at 20mA 1 0VDC Failsafe High Alarm Deadband 0 5 all S1 switches OFF Ambient 77 F 25 C Accuracy Repeatable to within 0 1 of input span for constant conditions 25 C Ambient Temperature Range 13 F to 167 F 25 C to 75 C Ambient Temperature Effect Less than 0 01 of output span per OF 0 018 per C over the ambient temperature range for reference test conditions Series 260A User s Manual Alarm Process Current Loop Powered Response Time The relay contacts switch from closed to open within 50mS for a step input change from 10 of span on one side of the alarm point to 5 of span on the other side of the alarm point for high or low alarms Minimum time between events 100mSec RFI Resistance Unit will not trip under influence of RFI when input is 0 5 of input span from setpoint voltage with RFI field strengths of up to 10V meter at frequencies of 27MHz 151 2 and 467 MHz EMI Resistance Unit wi
16. he line or drive potential and may exceed the source rating The effect of voltage drop within the system must be calculated to ensure that drive capability is not exceeded Output Wire contacts as shown in Connection Drawing 4501 113 see label on unit for relay type and contact rating Grounding The alarm is packaged in a General Purpose plastic housing and does not require an earth ground connection If the alarm is mounted in a metal housing ground wire connection is required In this case connect the ground terminal Green Screw to earth ground using suitable wire per applicable codes CALIBRATION This section provides information for unit configuration and calibration If the unit was factory calibrated the DIP switches have already been placed in their proper positions and verification of the calibration can be made per the Adjustment Procedure If the calibration of the unit is to be changed first go to the DIP Switch Configuration Procedure below before proceeding with the Alarm Adjustment Procedure Alarm DIP Switch Configuration Procedure The Loop Alarm is quite universal in that it can be configured as High or Low LO failsafe alarm for six values of deadband hysteresis and for latching or auto reset operation Before the adjustment procedure can proceed the DIP switches must be configured to the requirements of the application refer to Drawing 4501 115 for details To gain access to the DI
17. in Table 1 below Supplementary sheets are attached for units with special options or features Table 1 A Model Number Format 260A Input Output Mounting Certification Calibration B Typical Model Number 260A 20MA SN DIN NCR Series Output NCR Approval Notes Table 1 1 Alarm can be ordered with or without the factory calibration C option Consult the selection amp ordering guide for information required Any customer specified calibration information will be included on a separate calibration label on the unit 2 Consult the factory for current information on agency e g Canadian Standards Association etc approvals DESCRIPTION This two wire loop powered alarm accepts a 4 to 20mA input signal and provides a failsafe completely isolated SPDT 1 Form C dry contact relay output for switching AC or DC loads The unit derives all operating power from the loop and has a voltage drop of only 4 5VDC Being completely loop energized this alarm is ideally suited to provide a local alarm indication for already existing 2 3 or 4 wire transmitters without the need for additional wiring The alarm setpoint is fully adjustable from 4mA to 24mA The setpoint voltage may be precisely read at the field wiring terminals of the unit Internal DIP switches with Gold contacts allow the selection of HI LO failsafe alarm action six values of deadband and latching or auto reset operation An LED
18. ll not trip when input is 0 25 of input span from setpoint voltage with switching solenoids or commutator motors Surge Withstand Capability SWC Input Output terminations are rated per ANSI IEEE C37 90 1978 Unit is tested toa standardized test waveform that is representative of surges high frequency transient electrical interference observed in actual installations Construction Basic Alarm Circuit Board Military grade FR 4 epoxy glass circuit board Circuit Board Coating Fungus resistant acrylic conformal coat Terminals Compression type wire size 14 AWG maximum DIP Switch Contacts Gold flash over Nickel contacts Mounting Position Position insensitive MOUNTING A wide variety of mounting options and enclosures are available to meet the needs of the installation The available models are listed below The transmitter is shipped as a complete assembly General Purpose Housing Available with various mounting options listed below Case Self extinguishing NYLON Type 6 6 polyamide thermoplastic UL94 V 2 color black DIN General Purpose Housing with DIN Rail Mount Mounts to G amp rails Rail 32mm 50035 Rail 85mm EN50022 Refer to Drawing 4501 116 for outline and clearance dimensions Shipping Weight 1 pound 0 45 Kg packed General Purpose Housing Surface Mount Refer to Drawing 4501 117 for outline and clearance dimensions Shipping Weight 1 pound 0 45 Kg packe
19. ly isolated SPDT Form C dry contact relay output for switching AC or DC loads Unit includes full range setpoint adjustment utilizing a 22 turn potentiometer accessible from the front of the unit Internal DIP switches allow the selection of HI LO failsafe alarm action six values of deadband and latching or auto reset operation An LED provides a visual indication of the alarm condition The alarm has various mounting and enclosure options available MODEL SERIES 260A Color coded with a Yellow label INPUT 20MA 4 to 20mA input Power to operate this alarm is derived from the input signal loop Input current should be limited to 50mA or less to prevent damage to the alarm Alarm input is reverse polarity protected Input Impedance 225 ohms at 20mA typical input voltage drop 4 5V DC Isolation The output contacts are isolated from the input power circuits for common mode voltages up to 250V AC or 354V DC off ground on a continuous basis will withstand 1500V AC dielectric strength test for one minute without breakdown This complies with test requirements outlined ANSI ISA 582 01 1988 for the voltage rating specified Setpoint Adjust The Alarm Setpoint is adjustable from 0 to 125 of input current span readable as 0 2V DC 4mA to 1 2V DC 24mA at the terminals Example 0 6V DC at the terminals represents 50 of span or 12mA Resolution is 0 1 of span continuous on a 22 turn potentiometer The setpoint voltag
20. ng Water Tight Enclosure No Window Shipping weight 5 pounds 2 3 Kg packed IHW Instrument Housing Water Tight Enclosure With Window Window allows viewing of alarm LED Shipping weight 6 pounds 2 7 Kg packed CERTIFICATION Consult the factory for current information on the availability of agency e g Canadian Standards Association Factory Mutual etc approvals NCR No Certification Required INSTALLATION The alarm is packaged within a general purpose plastic housing and optionally mounted within a variety of protective enclosures The alarm should be located in an area that is protected from dust moisture and corrosive atmospheres The enclosure type determines the protection afforded in a particular environment and location make sure that this is not compromised Maximum operating ambient temperatures should be within 13 to 1670 25 to 75 C for satisfactory performance Connect as shown in Connection Drawing 4501 113 To verify calibration refer to CALIBRATION section Mounting To mount the alarm assembly Determine which configuration is utilized and consult the proper mounting instructions below Refer to the appropriate outline drawing for mounting and clearance dimensions Alarms can be mounted side by side on 1 0 inch centers if required DIN Rail Mounting Use suitable fastening hardware to secure the DIN rail to the designated mounting surface An alarm ordered with the DIN Rail mounting opti
21. od for identifying a faulty alarm is to exchange it with a known good unit It is highly recommended that a non functioning alarm be returned to Acromag for repair since Acromag used tested and burned in parts and in some cases parts that have been selected for characteristics beyond that specified by the manufacturer Further Acromag has automated test equipment that thoroughly checks the performance of each alarm 2 oc POWER SUPPLY TWO WIRE TRANSMITTER SETPOINT VOLTAGE READOUT 0 2 TO 1 0 DC 4 20 1 2 24mA SETPOINT INPUT VOLTAGE LOOP ALARM 4 5 DC DEADBAND SEE NOTE 4 SETPOINT ADJUST VOLTAGE EQUIVALENT TO 4 TO 24mA IS READABLE AT TERMINALS MANUAL RESET LATCH MODE PUSH TO RESET OR PUSH AND TURN CLOCKWISE TO LOCK OUT CAN BE DISABLED VIA INTERNAL DIP SWITCH SEE NOTE 5 TYPICAL 2 WIRE TRANSMITTER INSTALLATION L E D ALARM STATUS INDICATOR lt 5 FORM CONTACTS NOTES 2 amp 3 RELAY CONTACTS RATED AT 2A 3A MAX 28V DC OR 115V AC RESISTIVE N C VOLTAGE LOOP ALARM 4 5V DC FOUR WIRE SETPOINT VOLTAGE READOUT INPUT TRANSMITTER 9 2 1 0 DC 4 20mA 1 2 24 SETPOINT DEADBAND SEE NOTE 4 AC POWER HIGH LOW ALARM SELECTION SEE NOTE 3 SETPOINT ADJUST VOLTAGE 2 TO 1 2 4 24 IS READABLE AT TERMINALS TYPICAL 4 WI
22. on DIN can be mounted to either the or G Rail Installation of the alarm to the rail depends on the type of DIN rail used see Drawing 4501 116 Surface Mounting Secure the alarm to the designated mounting surface using two 6 32 screws Note that the mounting bracket has screw slots to facilitate mounting SNAPTRACK Mounting Secure the SNAPTRACK mounting channel to the designated mounting surface using suitable fastening hardware To install the unit in the mounting channel place the bottom end of the mounting bracket between the rails and press the top notched end firmly until the bracket snaps into place To remove the alarm insert a screwdriver into the upper arm of the connector and twist to release the unit from the track and tip the unit out Series 260A User s Manual Alarm Process Current Loop Powered NEMA 4 12 Enclosure Mounting Secure the enclosure assembly to the designated mounting surface using appropriate hardware The alarm is secured within this enclosure using two screws Note It is recommended that the alarm be removed from the enclosure during the process of drilling holes installing fittings and mounting the enclosure Instrument Housing Mounting Secure the enclosure assembly to the designated mounting position using appropriate hardware Note It is recommended that the alarm be removed from the enclosure during the process of mounting the enclosure To remove the unit from the enclosure
23. osure Example IN HI alarm DB 8 Non latching 5 After programming the DIP switches install the Alarm circuit board back into its case as described in the assembly procedure below Assembly Procedure for the 260A Plastic Housing NOTE The Model Serial Number label is attached to the Right plastic side 1 Refer to Drawing 4501 115 and line up the right plastic side with the board and terminal assembly Carefully but firmly press the pieces together 2 Before installing the left side place the mounting bracket unique to the mounting type you have around the pins at the back of the housing 3 Line up the left side of the housing with the assembly and carefully but firmly press the pieces together Alarm Adjustment Procedure Connect the alarm as shown in Connection Drawing 4501 114 There two methods of setpoint adjustment via setpoint voltage within 0 5 or input current within 0 1 Both methods are given below The setpoint voltage or input current should be measured to 0 1 accuracy or better for proper results The setpoint adjust potentiometer is accessible on the front panel of the alarm see Drawing 4501 114 for location The screwdriver blade used to adjust the potentiometers should not be more than 0 1 inch 2 54mm wide Alarm Calibration Example MODEL 260A 20MA SN DIN NCR Input 4 to 20mA Setpoint 12mA 0 6V DC at terminals Alarm Action High HI Alarm Alarm Mode Non L
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