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Operation
8.6 Fault and system messages
8.6.2
Message from the grounding switch
Switching statuses "MPGS safe ON" and "MPGS safe OFF".
The switching status of the make-proof grounding switch is indicated to the sequencer (D455
or CU320) by the messages "MPGS safe ON" and "MPGS safe OFF" via a TM15 module.
These messages are required for displaying the status and for interlocking the circuit-breaker.
Enabling the drive
The doors of the power unit are unlocked under the following conditions:
● The serial link of "Safe On messages".
● The potential-free contacts of the make-proof grounding switch.
● The enable signal of the open-loop/closed-loop control
The enable signal of the closed-loop/open-loop control is signaled when one of the following
conditions is satisfied:
● When after grounding the drive, an insulation resistance near 0 Ω is set.
● When the "Ground-fault monitoring (stator) fault status" signal has triggered.
This concept ensures a high degree of protection against residual voltages.
Check that the following prerequisites are satisfied before you switch on the drive:
● The doors are closed.
● The make-proof grounding switch is open.
● The insulation resistance is in the normal range.
If these conditions are fulfilled, you can start the drive.
Insulation monitoring
The deployed insulation monitoring device has an external delete input. This input is
interconnected in such a way that the fault messages are automatically acknowledged at the
insulation monitoring device.
If the drive ground is removed, the insulation resistance changes from short-circuit to the
system-specific setpoint.
The fault message is acknowledged.
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SINAMICS SM150 6SL3845-2NN41-8AD0
Operating Instructions Rev.201908010908 EXAMPLE
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