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Operation
8.5 Functions
8.5.3.4
Protection responses in an emergency
Figure 8-8
The overview diagram shows how central components are networked. The DRIVE-CLiQ
connection between CX32 and PSA is considered secure because communication on the
DRIVE-CLiQ cable is monitored cyclically. With regard to contactor control for the circuit-
breaker, a two-channel bypass to the open circuits is provided for safety reasons. This ensures
that the circuit-breaker triggers for every system-internal fault. This means system errors on the
CU or the PSA trigger the circuit-breaker. A bypass to the circuit-breaker is also provided via a
fiber-optic ring if faults occur in other inverter systems.
The following time-coded signals are transmitted via the fiber-optic ring:
● Pulse inhibit
● Circuit-breaker OPEN
● Short-circuiter CLOSED
● Conduction-through of all IGCTs
8.5.3.5
Vdc-max closed-loop control
The Vdc-max controller is not usually required, because the braking energy of the active infeed
is fed back into the power system. The VDC closed-loop control can increase the ruggedness
of the drive when power outages are expected or the medium-voltage power system cannot
safely absorb the braking energy.
For this purpose, the vdc-max closed-loop control must be parameterized to an activation level
above the setpoint of the Active Line Module. If a supply system fault occurs during a braking
action, the drive does not shutdown for overvoltage. The drive continues to brake with the
largest torque possible for the supply system characteristics and the internal losses.
124
Networked structures for safe shutdown in an emergency
SINAMICS SM150 6SL3845-7NN46-7AA2
Operating Instructions Rev.201910281345 EXAMPLE
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