ENMET CP-60 - Manual (Page 10)

CP-60 ENMET Corporation
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3.4.2 Relay Contacts
Auxiliary alarms should be powered from an independent power source separate form the instrument power to avoid alarm
failure due to controller malfunction.
Relay are SPDT , rated at 10Amp at 110 V AC or 10Amp at 30 V DC for restive loads, and may be latching or non-latching as
required by the application. They are accessed on the terminals next to each relay see Figures 2 & 5. The contact positions are
noted on the circuit board next to each terminal.
These relay coils are energized when they are in the non-alarm state; the contact conditions given above are for the non-
energized state, which is identical to the alarm state.
In addition, there is a fault relay, which changes state whenever the instrument is in a fault condition. The contact positions are
noted on the circuit board next to each terminal. The coil of this relay is energized when the instrument is in the non-fault state;
the contact conditions given on the circuit board next to the terminal, are for the non-energized state, which is identical to the
fault state.
The PC Board is labeled for the relays in their un-energized state. If the relay is configured for failsafe, then this is also the alarm
condition state. Non-failsafe configured relays in the alarm state, are the reverse of the PC board labeling. Note that the
Fault(FLT) relay cannot be set to operate in a Non-Failsafe mode. Please see the Table 1 below:
Table 1 : Relay Factory Default Failsafe Settings
Factory Default Settings Position Failsafe-Alarm Non-Failsafe-Alarm
Gas Alarm 1 J5 Relay 1 - NO Normally Open Normally Closed
Channel 1 J5 Relay 1 - COM Common Common
J5 Relay 1 - NC Normally Closed Normally Open
Gas Alarm 1 J6 Relay 2 - NO Normally Open Normally Closed
Channel 2 J6 Relay 2 - COM Common Common
J6 Relay 2 - NC Normally Closed Normally Open
Gas Alarm 1 J8 Relay 3 - NO Normally Open Normally Closed
Channel 3 J8 Relay 3 - COM Common Common
J8 Relay 3 - NC Normally Closed Normally Open
Gas Alarm 1 J10 Relay 4 - NO Normally Open Normally Closed
Spare J10 Relay 4 - COM Common Common
Not Programmed J10 Relay 4 - NC Normally Closed Normally Open
Gas Alarm 2 System J14 Relay 5 - NO Normally Open Normally Closed
Channel 1 – 3 J14 Relay 5 - COM Common Common
J14 Relay 5 - NC Normally Closed Normally Open
J15 Relay 6/FLT - NO Normally Open N/A
Fault J15 Relay 6/FLT - COM Common N/A
J15 Relay 6/FLT - NC Normally Closed N/A
These relay contacts can be used to operate auxiliary alarms or other functions.
3.4.3 4-20mA Outputs
Isolated 4-20 mA outputs are available for data logging or other purposes. An output is supplied for each active channel. These
outputs are available on the Connector 1(
J7 ) for channels 1 & 2 and Connector 2( J4 ) for channels 3.
4mA corresponds to the sensor reading of 0 at the bottom of the range.
20mA corresponds to a full scale reading.
Wiring requirements are the same as for the relays.
3.4.4 Digital Outputs
The RS232 & RS485 connections are used for firmware updates and digital communications. The CP-60 is designed to
operate as a modbus slave. Contact the ENMET for further information on wiring for the digital outputs.