page 10 of 25 GBB-EXKOM-08157/3
4.2 Description of function
The parts of the EXKOP
®MINI
Safety Controller are a central processing unit (CPU)
which monitors the signals of the transformer isolated barrier
KFD-ST2-Ex1.LB and the pressure switches on the QV Quench Valves. The CPU is
running with a fail safe program and observes the signaling cables for lead breakage
and short circuit.
4.2.1 Input modules
The transformer isolated barrier KFD-ST2-Ex1.LB is used for signaling the status of
the connected bursting discs or REMBE
®
Q-Rohr
®
. Upon activation of the Q-Rohr or
other safety devices, a signal is immediately sent to the EXKOP
®MINI
Safety
Controller. The signal is subsequently evaluated and the QV II Quench Valve will be
closed immediately.
The pressure switch is arranged at the compressed-air tank of the QV II Quench
Valve to monitor the operating pressure. If the pressure should fall below the
minimum operating value, closure of the QV II Quench Valve is initiated for safety
reasons.
In addition, other signals can be sent to the EXKOP
®MINI
Safety Controller:
- Infrared and/or pressure detectors for plant monitoring purposes.
- Signals from programmable controllers and/or central monitoring systems of plant
controls.
- Fire detection or fire extinguishing systems
4.2.2 Output modules
The output modules are for the activation of the QV II Quench Valves and the relay
contacts.
This modules supply the solenoid valve at the QV II Quench Valve with power. All
signals which could be determined as failures will lead to an immediate activation of
the output modules (fail safe).
The relay contacts (K), serve for audible and visual signaling of the alarm status
(horn and flashing light). The connection of additional alarm indicators can also take
place via relay contacts. This enables a safe and controlled plant shutdown procedure
in case of an alarm.
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