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www.nelsonheaters.com

GA-2129 Rev. 11

Sheet 10 of 22
Jul. 2018

If circuit #5 is not going to use a CMD, Flip switch 2 of row 2 off, and switch 1 of row 2 on.

Figure 7

POWER FREQUENCY

As shipped from the factory, the system is suitable for 60 Hz. If 50 Hz is required, programming option
Switch #8 must be flipped to ON position.

Figure 8

OFF for 60 Hz
ON for 50 Hz

z –

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Summary of Contents for Nelson CM-1

Page 1: ...CM 1 CIRCUIT MONITORING SYSTEM ...

Page 2: ......

Page 3: ...ime out 11 Scan Speed 11 Alarm Reset Auto Manual 11 Programming Option Features 12 CM 1 ambient panel start up procedures 13 MODBUS RTU Communication 14 OPERATION 15 Alarm Delay 16 Alarm Silence Button 16 CURRENT ADJUSTMENT PROCEDURE 17 Digital Display Window 18 SPECIFICATIONS 18 Performance 18 FIELD WIRING DIAGRAM 19 CONTROL DEVICE SCHEMATICS 20 ASSEMBLY DIAGRAM 21 NOTES 22 ...

Page 4: ... sensed systems Can be retrofitted into existing systems The main components of the system include A microprocessor based scanner that interrogates all circuit sensor cards and compares the data to its programmed parameters The maximum number of circuits monitored is 24 Sensor Card the sensor card contains the circuitry for 4 heater circuits Six cards are supplied in a 24 circuit system The sensor...

Page 5: ...entry when they cannot be avoided A drip loop is a dip or bend in the circuit wire to block or shed moisture which may follow a wire to the circuit boards Top Display Drip Loop Side Entry Drip Loop Drip Loop Drip Loop Bottom Entry On Off Switch TB 6 120 VAC Top Entry Enclosure Wall Sensor Module Scanner Module Panduit or avoid if possible Panduit or Circuit Board Circuit Board DO NOT USE THESE ARE...

Page 6: ...o reduce the wiring required for this type of connection FIELD WIRING Typical system wiring diagrams are included in this manual for field wiring These wiring diagrams are located at the back of the manual The PLT CMD is used to monitor bus continuity on a parallel type heating cable After the installing the heater cable on the pipe connect the PLT CMD to the opposite end of the power connection k...

Page 7: ...ed by current f low on process applications JB JB JB JB CM 1 Long side branch PNL WILL NOT WORK PNL BRANCH TEE PIPING single circuit multiple cable segments GROUPED SEGMENTS several separate cables thru single monitor point LEGEND Heater Cable Pipe Heater Connection Kit CM 1 CM 2 1 CMD CMD CMD CMD CMD CMD CMD CMD CMD CMD CMD PLT CMD Cable Connections to CM 1 Figure 3 ...

Page 8: ...tures and options will be covered on the next few pages However the system is suitable to be powered in the existing configuration When programming refer to Figure 13 which is also provided inside the door of the CM 1 enclosure If all 24 circuits are not active monitor not required flip the corresponding programming switches Programming can be changed in the field by flipping switches between on o...

Page 9: ...le in the system will be monitored or active If a circuit is de activated flip the appropriate programming switch off and the circuit will be skipped in the monitor sequence The mode switch is left on if a CMD is used parallel heaters in the circuit Figure 5 Examples If circuit 6 is to be de activated flip this switch off This circuit will not be scanned or monitored until the programming switch i...

Page 10: ...not going to use a CMD Flip switch 2 of row 2 off and switch 1 of row 2 on Figure 7 POWER FREQUENCY As shipped from the factory the system is suitable for 60 Hz If 50 Hz is required programming option Switch 8 must be flipped to ON position Figure 8 OFF for 60 Hz ON for 50 Hz z ...

Page 11: ...on switch 16 for installation and set up Flip Switch OFF for slow scan option switch 16 during normal operation Figure 10 ALARM RESET AUTO MANUAL In auto reset mode Switch in ON position The alarm status and remote alarm will clear automatically when a circuit fault clears In manual mode Switch in OFF position When a fault is cleared both the scanner display and the remote output will remain in al...

Page 12: ...www nelsonheaters com GA 2129 Rev 11 Sheet 12 of 22 Jul 2018 Figure 12 ...

Page 13: ...e Current alarms can sometimes be resolved by adjusting the current sensing trimpot located on the sensor card using the Current Adjustment Procedure section in the CM 1 manual Press the Alarm Reset button on the CM 1 panel to verify all alarms 4 If an alarm is still present after troubleshooting the circuit check the CM 1 Program switch configuration using the CM 1 manual The program switch confi...

Page 14: ...s S1 Ones 0 9 S2 Tens 10 90 Communications settings Baud Rate 4800 Data Bits 8 Stop Bits 1 Parity None CM 1 Register Addresses Descriptions Write 06 address 40000 Data 1 acknowledges all alarms Data 2 resets board all alarms Read 03 addresses 40000 40023 Channel Flag Table 40256 40264 CM 1 Board ID String ASCII 40512 Option Jumpers 1 8 40768 Option Jumpers 9 16 Channel Flag Bit Significance b15 b1...

Page 15: ... until the thermostat turns the heater off or a loss of voltage occurs or continuity is lost or amperage drops below the threshold After the alarm delay time out the red bar will light up and the remote alarm will energize This alarm condition will continue until the problem is fixed and the alarm reset switch is pressed if the system is in manual reset mode Alarm Reset Button S O Number Panel I D...

Page 16: ...he 30 second and 2 minute switches Figure 14 ALARM SILENCE BUTTON This button will temporarily silence the remote alarm up to 24 hours depending on the program pins see the Programming section for Alarm Silence Time out While corrective actions are being taken on failed circuit s the alarm will re enunciate if a new circuit fails when the system is silenced Pressing the Alarm Silence Button will s...

Page 17: ... the unit to close if you do BE SURE TO RETURN IT TO THE PROPER SET POINT AFTER CALIBRATION 3 At this point the circuit to be calibrated should be indicating HEATER ON green light ON Some heater cables have a higher inrush current when first turned on ALLOW HEATER TO OPERATE NORMALLY FOR 24 HOURS BEFORE STARTING CALIBRATION OF CURRENT ALARM 4 Locate the sensor card s current trimpot for the circui...

Page 18: ...A the maximum is 30A This would indicate an open circuit on a series heating cable On parallel cables this would indicate a possible break in the power wiring between the heater cable power termination and the CM 1 panel or the failure of a portion of the parallel heating cable 5 Continuity the red indicator energized would indicate a loss of continuity in the bus wires of a parallel heater cable ...

Page 19: ...www nelsonheaters com GA 2129 Rev 11 Sheet 19 of 22 Jul 2018 FIELD WIRING DIAGRAM ...

Page 20: ...www nelsonheaters com GA 2129 Rev 11 Sheet 20 of 22 Jul 2018 ...

Page 21: ...www nelsonheaters com GA 2129 Rev 11 Sheet 21 of 22 Jul 2018 ...

Page 22: ...www nelsonheaters com GA 2129 Rev 11 Sheet 22 of 22 Jul 2018 NOTES ...

Page 23: ......

Page 24: ... Copyright 2018 GA 2129 Rev 11 Nelson Heat Tracing System products are supplied with a limited warranty Complete Terms and Conditions may be found on Nelson s website at www nelsonheaters com ...

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