Installation Manual 26 Document #: LTRT-83506
Mediant 1000
2.4.8 Connecting to Dry Contact Relay Alarm System
The dry contact ports I and II located on the device's CPU module, allows you to connect
the device to an external audible or visual alarm system. The table below describes the
operational status of these dry contact ports.
Table 2-4: Dry Contact Operational Description
Port Normal State Alarm Severity State
I
During normal operation, the dry contact is
open.
If a Major alarm is generated, the dry
contact closes.
II
During normal operation, the dry contact is
closed.
If a Critical alarm is generated, the
dry contact opens.
The external alarm system is connected to the device's dry contact connector on the CPU
module, using the supplied dry contact wires’ mate (refer to the figure below). The mate
provides four spring-cage terminal block connector labeled 4, 3, 2 and 1 (from left to right).
These connections correspond to the four pins of the dry contact connector on the CPU
module.
Figure 2-14: Dry Contact Wires’ Mate
You need to supply your own wiring (for connecting to the mate’s spring-cage connections)
as well as a visual and/or audible alarm system attached at the other end of the wires. The
dry contact connector suites wire sizes in the range 20 to 28 AWG. In addition, the dry
contact system can receive a current of up to 1.5 A.
Note: The dry contact alarm provided on the CPU must be connected only to SELV
(Safety Extra-Low Voltage) non-energy hazard sources (Class 2) as per UL
60950 and EN 60950.
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