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7.3 Pressure Monitoring
The DS1 capacitor switch has pressurized poles with dry air at
3.7 bar relative nominal pressure (53.66 PSI) at approximately
25 °C.
Note
The pressure inside the device depends on the tempera-
ture.
DS1 has been tested at minimum pressure.
Please note that if a fault occurs (temperature variation at
the filling stage and tolerance of the pressure meter) when
DS1 is operating at the minimum temperature (-15 °C), the
pressure could drop to a value able to trigger the warning
level.
However, functionality at the DS1 pressure warning level is
fully ensured.
The device stops operating at blocking pressure.
It is equipped with a pressure sensor that connects all poles
together.
A charging/discharging valve is installed inside the switch as
shown below:
Figure 23. DS1 pressure sensor with its charging valve
7.4 Interface summary for Maintenance
and Commissioning
The BI/BO outlined below allow full management of DS1:
− Open Binary Input
− Close Binary Input
− Interlock (loop made in the internal wiring of DS1)
− Reset Binary Input
− Homing Binary Input
− Upstream CB binary Input
− Pressure OK (active high contact from the pressure sensor)
− Pressure Warning (active high contact from the pressure
sensor)
− Pressure Low (active high contact from the pressure sensor)
− Ready Output (Normally Open dry contact)
− Alarm Output (Normally Open dry contact)
− Watchdog Output (Blinking solid-state output)
− Open status Auxiliary contact
− Close status Auxiliary contact
All the BI must be stimulated and the status and position
(Open/Close) of all the BO must be detected during DS1 com-
missioning and maintenance (Open/Close).
Alternatively, a small portable panel (ADD-ON control panel) can
be used for commissioning, as shown in the example below:
Figure 24. Simple interface for early functional tests
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