AQUALEAK EMS-10, Instruction Manual

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Environmental Monitoring System (EMS-5 / 10) Instruction Manual
13
3.2 Relays and Sensors
Although multiple sensors and sensor types may be connected to the unit, there must always be
an
end of line (EOL) terminating resistor at the end of the sensing circuit to allow for cable break
monitoring and alarm reference set point . The unit relies upon a terminating resistor of value
47k ohms .
The unit should be
powered OFF when making connections. Sensors should be installed so that they remain
accessible for maintenance .
3.2.1 Relay Functions and Triggers
Relay Function Description and Triggers
1-10 Individual zone Used to operate auxiliary devices.
11 Common Alarm /
Fault Relay latched upon alarm until acknowledged by User or Engineer.
✓
Zone cable break
✓
Motherboard communication
failure
✓
Zone Alarm
✓
Interface boards / communication
failure
12 Cable break Relay latched upon alarm until acknowledged by User or Engineer.
✓
Zone cable break.
13 Alarm Relay latched upon alarm until acknowledged by User or Engineer.
✓
Zone alarm
14 Latch on Alarm
(13) and/or Cable
Break (12). Relay latched only when alarm or cable break present in real time.
✓
See Alarm (13) and/or Cable Break (12)
15 Watchdog Relay normally energised. De-energised on any system fault.
✓
Motherboard loss of power
✓
Interface Board (IB) loss of power
✓
Complete power failure to EMS
✓
Motherboard communication
failure
✓
Interface Board communication
failure
16 Spare Unused.

Not applicable
Table 3: Relay Functions and Notes / Triggers