ABB ACS880-204LC, Hardware Manual

Page: 120 / 278

Tasks
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.
Switching the supply unit off
1. Stop the motors connected to inverter units.
2. Deactivate the Run enable signal to open the main circuit breaker [Q1]. This can be
done, for example, with an operating switch [S21].
Additional instructions for closing the DC
switch-disconnector
If the DC bus is not alive and the main DC switch-disconnector [Q11] is in OFF position, the
main DC switch-disconnector [Q11] is mechanically locked to OFF position by interlock
[K11]. In order to get the supply unit started there are two possibilities: the DC bus is powered
up by another supply unit (if applicable), or the DC bus must be powered by means of the
local charging control switch [S4], which forces the charging circuit on.
IGBT supply modules can then be charged as follows:
Note:
Before local operation of the charging circuit via local charging control switch [S4], make
sure that the main breaker(s) of the supply unit is racked in and the DC switch-disconnector
for line-up charging [Q40] is closed.
• Force the charging circuit of the unit on via setting the local charging control switch [S4]
to position “1”.
• Wait for a few seconds for the DC bus charging up to nominal voltage level.
• Charge the IGBT supply modules: close the charging switch [Q10] of the units that are
to be powered up.
• After the IGBT supply modules are charged and the charging light [P11] on the cabinet
door illuminates, the lock of DC switch-disconnector [Q11] is released. The main DC
switch-disconnector [Q11] can now be closed, and the charging switch [Q10] opened.
• Repeat this for all IGBT supply module cubicles belonging to this supply unit.
• After that, set the local charging control switch [S4] back into OPEN position and the
DC bus will be discharged again.
When the DC switch-disconnector [Q11] is in ON position, follow the normal start-up
procedure to charge the line-up and to start the operation of the supply unit.
120 Start-up