Siemens SINAMICS SM150 - Protection Responses in an Emergency

The resistors absorb the energy stored in the DC link and limit the current. In the event of false
tripping, the torque surge for the machine, which is still rotating, is limited by the resistors.
WARNING
High voltage
If the short-circuiter is defective, this can significantly increase the discharge time.
High voltages cause death or serious injury if the safety instructions are not observed or if
the equipment is handled improperly.
Never use force to open the doors while the DC-link capacitors are discharging.
Always observe the five safety rules in "Safety information/personnel protection" and in the
drive documentation.
8.4.3.4 Protection responses in an emergency
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Figure 8-8 Networked structures for safe shutdown in an emergency
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
Operation
8.4 Functions
SINAMICS SM150 6SL3845-7NN46-7AA0
144 Operating Instructions 04/2017