Electromagnetic Interlocking; Switching Off The Supply Unit And The Drive; Disconnecting The Drive From Ac Power Line (Excluding The Input Power Terminals), And Temporary Grounding - ABB ACS880-207 Hardware Manual

70 Start-up
Tasks
Turn the operating switch [S21] to on (1) position to activate the Run enable signal of the supply unit.
WARNING!
Never use the green (I) push button of the main breaker ([Q1], option +F255) for closing. If
the button is not disabled, it closes the main breaker immediately without the drive DC link
charging sequence. This causes overcurrent which blows the main circuit fuses.
Now, the supply unit starts and the control program controls it through the drive power-up sequence:
1. charging contactor [Q4] switch on, 2. charging (until the DC link voltage rises high enough), 3. main
contactor [Q2] / breaker [Q1] switch on, 4. start of the supply module rectifying, 5. charging contactor
[Q4] switch off.
On-load checks
Check that the supply module cooling fan and LCL filter module fans rotate freely in the right direction.
A paper sheet set on the intake (door) gratings stays. The fans run noiselessly.
Validate the operation of safety functions (for example, emergency stop).
WARNING!
The safety functions are not safe before they are validated according to the instructions. Safety
functions are optional. See the function-specific manual for the validation tasks.

Electromagnetic interlocking

￭
Note: If the unit is equipped with a grounding switch ([Q9], option +F259), electromagnetic
interlocking is also used. Therefore:
• You cannot close the grounding switch [Q9] if the main disconnecting device is closed*,
or the drive auxiliary power is switched off.
• You cannot close the main disconnecting device* if the grounding switch [Q9] is closed,
or the drive auxiliary power is switched off.
See the circuit diagrams delivered with the drive.
* Depending on the main disconnecting device type, this means either of these: The main
switch-disconnector ([Q1], option +F253) is closed, or the main breaker ([Q1], option +F255)
is racked out.

Switching off the supply unit and the drive

1. Stop the motors connected to the drive (that is: give stop command to all inverter units).
2. Turn the operating switch [S21] to the off (0) position to deactivate the Run enable signal
of the supply unit and to switch the main contactor [Q2] / breaker [Q1] off.
Disconnecting the drive from AC power line (excluding the
input power terminals), and temporary grounding
1. Switch off the drive. See section
above.
2. Depending on the main disconnecting device type: Open the main switch-disconnector
([Q1], option +F253), or rack out the main breaker ([Q1], option +F255).
3. Switch the charging circuit switch fuse [Q3] off.
Switching off the supply unit and the drive (page 70)