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26 Operation principle and hardware description
WARNING!
The main disconnecting device does not isolate the input power terminals, AC
voltage meters ([P5.x], option +G334) or the auxiliary circuit from the power line.
To isolate auxiliary voltage, use the auxiliary voltage switch [Q21]. To isolate the
input power terminals and AC voltage meters, open the main breaker of the supply
transformer and lock it to the open position.
If the drive is equipped with a main breaker and has a charging circuit: The main
circuit breaker does not isolate the charging circuit. Use the charging switch [Q3].
￭
Auxiliary voltage switch [Q21]
The supply unit is equipped with an auxiliary voltage switch [Q21] as standard. Using the
switch, you can disconnect the auxiliary circuit from the power line. The switch has an
operating handle on the cabinet door.
￭
Grounding switch [Q9.x]
The supply unit can be equipped with an optional grounding switch ([Q9.x], option +F259).
Using the switch, you can temporarily ground the main AC busbars of the supply unit during
the maintenance work. The switch has an operating handle on the cabinet door.
WARNING!
The grounding switch does not ground the input power terminals of the drive or
the auxiliary (control) voltage circuits.
￭
Operating switch [S21]
The operating switch [S21] is a standard device.
By default, the operating switch controls the unit as follows:
•
The ENABLE/RUN position energizes digital input DI2 of the control unit: Control program
receives Run/Enable command and controls the supply unit power up via the control
unit I/O interface. The supply unit first charges the drive DC link and then starts normal
operation. The main breaker [Q1] closes.
•
The OFF position de-energizes digital input DI2 of the control unit: Control program
does not receive Run/Enable command and it opens the main breaker [Q1]. Supply
module stops rectifying.
Position ENABLE/RUN (1)
ENABLE / RUN
0-1
Position OFF (0)
ENABLE / RUN
0-1
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