Atest Gaz Alpa EcoTerm XT, User Manual

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detector, and the control unit should signal the failure of the detector (no detector at the end of
the loop).
Turn off the power supply.
Repeat these steps for the next T-connectors and detectors.
In the detectors, set the configuration switch in position 1. In the last detector, set the
configuration switch in position 2 (see Figure 6). The control unit should show the state of
"OPERATION" for the whole bus.
Perform the test of the entire assembled bus. For this purpose, force the alarm on the last
detector by pressing the "TEST" button in the detector. After a period of time dependent on the
number of sensors (approx. 5-30 seconds), the control unit should signal "ALARM."
With the pressed "TEST" button, measure the power supply voltage on the last detector. It should
not be less than 10 V. If it is lower, it is recommended to use a higher power supply voltage or use
a connection into a closed alarm loop.
9.2.2.3 Closed alarm loop
Figure 10: Closed alarm loop
This solution differs from the previous one only by the following details:
configuration switches for all detectors incorporated into the loop (ring) are set to Position 1 (the
control unit is considered as the terminal device) – see Figure 6,
output of the last T-connector is linked to the input of the control unit.
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User Manual: POD-044-ENG R01
Control Unit