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TTDM-128
User Manual
Appendix 2 -
Connection to Other Devices
NOTE: All connections to external devices are made at the TTDM-128.
RELAYS
TTDM-128 has three relays:
Service
Leak
Fault
Relay Logic
Each relay provides two Form-C relay contacts, with normally open and normally closed
contacts both provided. The relays are de-energized to indicate an alarm condition. The
diagram below shows the relay status when each is in an alarm (de-energized) state.
Wiring Options to Gang Alarm Relays on a Single Pair of Wires
The illustrations below show how the relays can be jumpered together to allow remote
monitoring of the TTDM-Plus system status with only a single pair of wires. The TTDM-
128 de-energizes its relays to signal an alarm condition. Therefore, loss of power as well
as any other type of alarm would trip the remote alarm.
Open on Alarm
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
(open on alarm)
Relays wired
in series
15 16 17 201918 21 22 23 262524 27 28 29 323130
LEAK RELAYSERVICE RELAY FAULT RELAY
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