Atest Gaz PW-072-A, Руководство пользователя

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4.5 NC valve output
The Sigma Control L Control Unit is adapted to work with an NC (normally closed) valve. The valve is
connected to universal relay outputs (see section 4.2).
The way of controlling the NC valve is shown on Figure 9.
Figure 9: NC valve control
The manual change of valve state occurs after holding the appropriate button for 5 seconds ( or ).
Loss of control unit power supply will close the valve. After the voltage is restored, the valve will return to
its previous position.
4.6 Service interface
At the bottom housing wall (see Figures 1 and 2) there is a service connector. It is designed to connect
a service tool to Sigma Control L Unit (e.g. a PC with proper software installed). Interface parameters – see
section 10.
4.7 Extension Module Interface
Extension Module Interface allows users to expand the functionality of Sigma Control L Unit. The interface
port makes it possible to install the Extension Module Interface.
To install the Extension Module, take the following steps (see also figure 10).
1. Disconnect power supply from the control unit.
2. Remove the unit cover.
3. Disconnect the front panel by removing its cable from the port (see figure 2).
4. Install the module in the Extension Module slot (see figure 2) – step I and II (figure 10).
5. Connect cables to the Extension Module.
6. Re-connect and replace the unit cover.
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User's Manual: POD-026-ENG R17
Pushbutton
NC valve
control
Gas concentration
ALARM
Time
ALARM – output
disable
Operator presses the
pushbutton, valve
manually opened
Valve manually
closed
Pushbutton
ALARM disappears,
valve stil closed
It is not possible to open
the valve manually