Siemens SINAMICS GM150

8.5 Fault and system messages
8.5.1 External alarms and faults
With the terminal blocks TM15/TM31, there are 24 terminals. With STARTER or SCOUT, you
can select which predefined messages are displayed and which protection devices are to be
triggered. The list of parameterized faults and alarms can be found in the List Manual in the
"Faults and alarms" section.
8.5.2 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 (D435
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 closed-loop/open-loop controller unlocked.
The enable signal of the closed-loop/open-loop controller 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.
Operation
8.5 Fault and system messages
SINAMICS GM150 6SL3815-2LN41-4AA2
184 Operating Instructions 04/2017