Ax60+ Multi-Gas
Service Manual
Int. Approved
Document ref: P0159-803-11
September 2019
Page 38 of 62
Copyright © 2015 Analox Ltd. All Rights Reserved.
Commercial in Confidence
8.4
Relay configuration
Two relays are installed in the Central Display, R1 and R2. These can be independently configured to be triggered by any
alarm or fault raised in the system. The installer is responsible for any connections from R1 and R2 to external devices
such as mains relays or control systems. Relays R1 and R2 are both factory configured as per the below detail:
Relay configuration for CO2 alarms
R1 will energise on alarm 2 (1.5%), on alarm 3 (3.0%) being reached R2 will energise and R1 will remain energised.
R1 & R2 will only de-energise when the gas level has fallen below the respective alarm levels AND the alarms have been
accepted and reset.
Relay configuration for O2 alarms
R1 will energise on alarm 2 (19.5% or lower), R1 will de-energise when the gas level has risen above 19.5% and the alarm
has been accepted and reset.
R2 will energise on alarm 3 (23.0% or higher), R2 will de-energise when the gas level has dropped below 23.0% and the
alarms have been accepted and reset. On alarm 4 (18.0%) both R1 and R2 will energise, R2 will de-energise when the gas
level has risen above 18.0%, R1 will de-energise when the gas level has risen above 19.5%.
Each relay can be reconfigured to switch on a different alarm, fault or combination of alarms & faults.
8.4.1
Fail safe relays
The Ax60+ central unit is fitted with two relays which operate in conjunction with the sensor alarms. The relays have
single pole change-over contact arrangements, rated to switch up to 3 Amp at 250V AC/30V DC. The default
configuration has the relays set in a Fail-Safe state.
The relays may be configured to be energised or de-energised, when the instrument is in a non-alarm state. If the relays
are configured to be in a normally energised state, this will provide a ‘Fail
-
Safe’ facility in that a total power
failure will
cause the relays to release and signal an alarm condition. Contact arrangement is shown on the PCB for a non-Fail-Safe
or normally de-energised relay.
Summary of Contents for Ax60+ Multi-Gas
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