Atest Gaz EcoAlpa PW-054 Series, User Manual

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5.2 Relay output
The EcoAlpa control unit has three relay outputs:
R1 – Failure
This output may adopt one of two possible states: it is closed if no failure is detected within the
Gas Detection System or opens when at least one defect is detected in any device incorporated
into the system or when power voltage failure takes place. Status of contacts is shown in Figure 4:
Figure 4: Status of contacts for the R1 (failure) relay
R2-R3 – these outputs may also adopt one of two possible states, i.e. outputs can be either active
of inactive:
Figure 5: R2 and R3 relays in the active and inactive modes
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User Manual: POD-017-ENG R01
No failure
COM
NO
NC
Failure
NO
COM
NC
Active
COM
NO
NC
Inactive
NO
COM
NC