Switching Off The Unit; Disconnecting And Temporary Grounding The Drive (Excluding The Input Power Terminals); Disconnecting And Temporary Grounding The Drive - ABB ACS880-207 Hardware Manual

66 Start-up

Switching off the unit

1. Stop the motors connected to IGBT supply units. See the IGBT supply unit firmware
manual.
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] off.

Disconnecting and temporary grounding the drive

(excluding the input power terminals)
1. Switch off the drive. See section
2. Switch the main switch-disconnector/air circuit breaker [Q1] off.
3. Switch the charging circuit switch fuse [Q3] off.
4. Supply unit with the grounding switch ([Q9], option +F259): Switch the grounding
switch on.
WARNING! Do not use excessive force. There is electromagnetic interlocking in
use. You cannot switch the grounding switch [Q9] on before its lock release relay
[K9] is energized, that is:
•
the main input terminals [L1, L2 and L3] are powered, and
•
main switch-disconnector/air circuit breaker [Q1] is switched off, and
•
auxiliary voltage switch [Q21] is switched on, and
•
circuit breakers [F22 and F23] in between the relay [K9] and auxiliary voltage switch
[Q21] are switched on.
5. Switch off the auxiliary voltage by turning the auxiliary voltage switch [Q21] to the off
position.
6. Switch off the external auxiliary supply voltage (supply unit option +G307), and any
other dangerous voltage connected to the drive from outside.
7. Secure against reconnection: Lock the disconnectors and attach warning signs.
8. Wait for 5 minutes to let the drive DC link capacitors to discharge.
9. Open the door and ensure by measuring that the main circuit after the main switch-
disconnector/air circuit breaker [Q1] is not under voltage.
Supply unit without the grounding switch (no option +F259):
If temporary grounding is needed, connect a temporary grounding system to the main
AC busbars after the main switch-disconnector/air circuit breaker and to the grounding
(PE) busbar of the drive. See the local regulations and EN 50110-1: 2004.
WARNING! The input power busbars are under voltage. Do not remove the
shroud in front of them.
Switching off the unit above.