Siemens SINAMICS PERFECT HARMONY GH180 - 10.3 Safe VFD Power Down and Door Access

10.3 VFD Power Down and Door Access
10.3.1 Mechanical Interlock System (if provided)
Mechanical Interlock System
The drive can be locked mechanically using a key interlock system. For safety, the drive may be
delivered with a key transfer system that interlocks the doors to restrict personnel access.
Once the primary-side (customer) circuit breaker has opened, a coded key (K1) for enabling the
(K2) keys in the key transfer unit can be removed.
Operation
1. Switch o󹪜 the primary-side (customer) circuit breaker.
2. Apply the LOTO (Lock-Out-Tag-Out) procedures as required by local code.
3. The coded K1 key from the customer circuit breaker can now be removed.
4. The coded K1 key is required to release the K2 keys for cabinet doors (located in the key
transfer unit on the VFD).
10.3.2 Unlocking the Doors
The doors of the VFD must not be opened until the following statuses are present:
1. The EMERGENCY STOP push-button on the control section door has been activated.
2. The key-operated switch on the control section door has been set to OFF position.
3. A delay time of 10 minutes from the time of de-energization of the incoming power to the
VFD medium voltage doors or panels to the time the VFD doors can be opened, has occurred.
4. The DC-link voltage has been de-energized.
Note
DC Bus-Voltage Indicator LED must NOT be illuminated
The DC Bus-Voltage Indicator LED, located on the front of each cell's Cell Control Board, must
NOT be illuminated. An illuminated DC bus voltage-indicator LED shows that more than
50 Vdc is present on the DC bus. This indicator light may not be visible until the cell doors are
opened.
5. If drive is equipped with optional ground switch (input, output, or both), it shall be closed.
Refer to section titled "Closing the Make-proof Grounding Switch" found in this chapter.
Note
Allowable Wait Time - Closing Make-Proof Grounding Switches
The make-proof grounding switches can be closed only after the 10 minutes waiting time
after de-energization.
Maintenance
10.3 VFD Power Down and Door Access
Type 6SR5 Air-Cooled
Operating Instructions, AK, A5E39390112 59