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Relay output
Description
R1
Failure
The relay is activated when any component of the gas detection system is defective.
R2
Warning
The relay is set to the active mode when any gas detector reports exceeding of the gas
concentration about the warning level.
Valve
For the design option designated as EcoAlpa P17 230V AC that relay output is
used to control a shutoff valve with the power supply voltage of 230V. The relay
produces three impulses after any gas detector reports increase of the gas
concentration above the alarm level. The procedure for valve control is described
in Section 5.4
R3
Alarm
The relay is set to the active mode when any gas detector reports exceeding of the gas
concentration about the alarm level.
Table 4: Description of functions assigned to R1 - R3 outputs
5.3
Output for control of a light and sound warning device
The control unit can be provided with a dedicated output designed to control light and sound warning
devices (OC1 – a warning light, OC2 – an alarm siren). After the warning level for gas concentration is
exceeded, the control unit activates the output assigned to the warning light whilst exceeding of the alarm
threshold triggers generation of a modulated signal at the output assigned to the alarm siren (see
parameters of outputs in Section 10).
5.4
Output for control of a gas shutoff valve
The output dedicated for connection of a shutoff valve suits to trip a valve actuator and is designed to
control one poppet, ball or flap valve (applies to the ZMZ module) – see parameters in Section 10. After
concentration of a hazardous gas exceeds the tripping threshold the supply of gas (shutoff of a gas
supplying valve) is carried out with a specific delay (ca. 2 seconds) to avoid undesired breaks in gas supplies
in case of short-time concentration peaks. Only if gas concentration keeps exceeding the permissible level
after that delay interval expires, the module produces three impulses to shut the valve off.
5.5
Output of the ZMZ module
The output is designed to connect an additional Remote Shutoff Module ZMZ (see Section 7).
5.6
Output of an external alarm
This output produces an external alarm signal to enable collaboration of the gas detection system with
other external systems of automatic control, e.g. fire protection, BMS. Upon the external output is activated
the sound and light warning device is activated, the gas supply valve is closed and relay outputs for warning
and alarm signals are closed. The activated status of the external alarm output is indicated on the front
panel of the control unit by means of a dedicated LED.
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User Manual: POD-017-ENG R01
Summary of Contents for EcoAlpa PW-054 Series
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