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8.6 Interlocking System
8.6.1 Electromagnetic Interlocking System
N O T I C E
The electromagnetic interlocking system is installed as standard in IEC type drives.
The electromagnetic interlocking system ensures that the cabinet doors cannot be opened during operation of the drive.
Operation of the electromagnetic interlocking system
Before HV power on: All electromagnetic locks are energized, all doors are unlocked, and can be opened or closed. Only after all
doors are closed, and after self-diagnosis, the PLC can send out the "MCB closing allowed" signal.
HV power on: Once the MCB is closed to power the drive, the electromagnetic locks are de-energized, the doors are locked, and
cannot be opened during operation of the drive. If the doors are opened despite the locking (for example, by force), an "MCB
trip" signal is immediately sent to trip the MCB.
HV power off: After the drive is powered off and the power cell discharge process is completed (15 minutes), the electromagnet-
ic locks are energized, the doors are unlocked, and can be opened.
8.6.2 Mechanical Interlocking System
N O T I C E
The mechanical interlocking system is installed as standard in UL type drives. It is available as an option for IEC variants.
The interlock system ensures that a process is followed and cannot be circumvented or short cut. The transfer of a key ensures that
wherever personnel find themselves, in either starting or shutting down operations, they can be assured that they are safe.
The interlock device contains three main parts:
Main key for the isolating means (only one)
Door keys (one for each cabinet door)
Key exchange box
Illustration 68: Key Exchange Box
Operation of the interlock system
While the main key for the isolating means is free from the key exchange box, the other door keys are locked in the box.
To release the door keys sequentially, insert and turn the main key in the key exchange box. The released keys can then be used
to open the cabinet doors and to access the hazardous areas.
The inserted main key stays locked in the key exchange box until all the released door keys are returned to their original posi-
tions.
The drive cannot be restarted until all the door keys are returned to the key exchange box and the main key is removed and
taken to the isolating means.
AQ363633621020en-000201 / 172F311778 | Danfoss A/S © 2021.06
Commissioning
VACON® 1000
Operating Guide
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