ENMET ISA-60M with MRI-5175 - Manual (Page 11)

ISA-60M ENMET Corporation
8
3.2.1 Outputs
Two types of alarm outputs are available, relay contacts and 4-20mA outputs.
3.2.2 ISA-60M Relay Contacts
Relay contacts are available for each alarm; these 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
Figure 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 2 below:
Table 2: Relay Failsafe Settings
Position Failsafe-Alarm Non-Failsafe-Alarm
J5 Relay 1 - NO Normally Open Normally Closed
J5 Relay 1 - COM Common Common
J5 Relay 1 - NC Normally Closed Normally Open
J6 Relay 2 - NO Normally Open Normally Closed
J6 Relay 2 - COM Common Common
J6 Relay 2 - NC Normally Closed Normally Open
J8 Relay 3 - NO Normally Open Normally Closed
J8 Relay 3 - COM Common Common
J8 Relay 3 - NC Normally Closed Normally Open
J10 Relay 4 - NO Normally Open Normally Closed
J10 Relay 4 - COM Common Common
J10 Relay 4 - NC Normally Closed Normally Open
J14 Relay 5 - NO Normally Open Normally Closed
J14 Relay 5 - COM Common Common
J14 Relay 5 - NC Normally Closed Normally Open
J15 Relay 6/FLT - NO Normally Open N/A
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.
3.2.3 4-20mA Outputs
Isolated 4-20 mA outputs are available for data logging or other purposes. An output is supplied for each sensor supplied in a
particular instrument, and can be added when a sensor is added in the field. These outputs are available on the Connector 1(
J7 )
for channels 1 & 2 and Connector 2( J4 ) for channels 3 & 4.
4mA corresponds to the sensor reading of 0 at the bottom of the range.
20mA corresponds to a full scale reading of 30.
Wiring requirements are the same as for the relays.
3.2.4 Digital Outputs
The RS232 & RS485 connections are used for firmware updates and digital communications. The ISA-60M is designed to
operate as a modbus slave. Contact the ENMET for further information on wiring for the digital outputs.