Atest Gaz EcoAlpa5, User Manual

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4.2.2 Warning
control for a shutoff valve with the coil voltage of 230 V (only for the PW-090-V230-0 design
option) – interconnections between the control unit and the valve are shown in Figure 8,
output of a warning signal for other design options of the control unit:
• the output is active (contacts COM and NO are shorted) when appearance of a hazardous gas is
revealed by the detection system and the warning threshold for gas concentration is exceeded
or an external alarm signal is received,
• the output is inactive (contacts COM and NO are isolated) when the warning threshold
established for the gas detection system is not exceeded and no external alarm signal is
received.
4.2.3 Failure (inverted output)
the output is active (contacts COM and NO are shorted) when no failure is reported by the gas
detection system,
the output is inactive (contacts COM and NO are isolated) when a failure is reported by any single
component of the system or when power voltage for the system disappears.
4.3 Input of an external alarm
This input is provided to enable collaboration of the gas detection system with other external systems of
automatic control, e.g. fire protection, BMS. Upon the external alarm input is activated, the sound and light
warning devices are activated as well, the gas supply valve is closed and relay outputs for warning and alarm
signals are closed. The activated status of the external alarm input is shown on the front panel of the
control unit by the EXT. ALARM indicating LED, see Table 14.
The input of an external alarm should be controlled by means of a toggle (no-voltage) switch. The external
alarm shall be activated when the contacts are open (see Figure 6). If the output is not used its D1 and D2
contacts must be shorted by means of a jumper.
Figure 6: Status of contacts for a toggle switch connected to inputs of an external alarm
4.4 Optical – acoustic signalling device output
The control unit is provided with an output dedicated for control of a sound and light warning device. Upon
the warning threshold of gas concentration is exceeded only a warning lamp (beacon, stacklight, etc.) is
activated. Exceeding of the alarm level for gas concentration leads to production of a modulated signal at
the output assigned to an alarm siren (see parameters of these outputs in Table 14).
4.5 Output for the ZMZ module
This output is designed to connect an additional Remote Shutoff Module ZMZ.
4.6 Output for valve control
This output is used to control a gas shutoff valve by tripping the valve trigger switch. Parameters of the
output enable connection of a single valve with parameters listed in Section 9.
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User Manual: POD-057-ENG R01
External alarm
D1 D2
No alarm
D1 D2