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34 Operation principle and hardware description
User operates the charging switch with a handle on the cabinet door. The switch must
be closed during the drive power up to enable charging. ABB recommends to keep the
switch open otherwise.
If the supply unit is equipped with the DC switch/disconnector [Q11] (option +F286),
ABB adds an additional DC switch/disconnector [Q40] to the supply unit charging
circuit automatically. With the DC switch/disconnector [Q40], user must isolate also
the charging circuit from the drive DC link when he/she isolates the supply modules
with the DC switch/disconnector [Q11].
Operating switch [S21]
￭
As standard, the operating switch [S21] controls the drive as follows:
•
ENABLE/RUN (1) position: Run enable and Start signals of the supply unit are
active. If the drive is de-energized, the control program runs the power up
sequence: supply unit charges the drive DC link, closes the main contactor [Q2]
or the main breaker [Q1] and starts the normal operation.
•
0 position: Supply unit stops and opens the main contactor [Q2] or the main
breaker [Q1].
Position ENABLE/RUN (1)
DC switch/disconnector [Q11], charging switch [Q10] and indicator
￭
lamp [P1]
User can isolate the supply modules from the drive DC link with the DC
switch/disconnector [Q11] (option +F286). The DC switch/disconnector assembly also
also includes a charging switch [Q10]. Before the user can close DC switch-disconnector
[Q11] and reconnect the modules back to the DC link, he/she must charge the supply
module capacitors through the charging switch [Q10]. Indicator lamp [P1] goes on
when user can close the DC switch/disconnector [Q11]. User operates the DC
switch/disconnector and the charging switch with handles on the cabinet door.
Note: If the unit consists of multiple supply module cubicles, each cubicle is equipped
with a DC switch/disconnector and charging switch. The DC switch/disconnector
isolates only the supply modules within that particular cubicle.
Operating instructions
WARNING! Open the DC switch/disconnector [Q11] only when the supply unit
is stopped and there is no load.
Supply unit DC link disconnecting procedure:
1.
Stop the inverter units and the supply unit.
2.
Open the DC switch/disconnector [Q11].
Position OFF (0)
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