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SIMOVERT MV Commissioning Instructions
25
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The safety circuit consists of hardware contacts in series. This arrangement
guarantees that the circuit-breaker can always be opened, even after a program
error.
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This function can neither be used to guarantee that the drive comes to an
immediate standstill nor that there are no residual voltages at the output terminals
and inside the equipment.
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The SIMOVERT-MV drive converter is equipped with a mushroom head
pushbutton in the door. If the circuit is opened using this pushbutton, the relay K12
drops-out (refer to Fig. 3.1).
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The sub-station is monitored using a relay contact of the SUL module. This relay is
closed, if the following conditions are fulfilled:
1. Communications between the ISL and SUL modules is undisturbed (fiber-optic
cable link)
2. The power supply for the sub-station is greater than 19.5 V.
3. The cyclic program on the sub-station is operating error-free.
4. The short-circuiting device is not active.
5. Binary input No. 4 of the SUL module is high.
If one of these conditions is not fulfilled, the circuit-breaker is opened and the
crowbar thyristor triggered.