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Supply unit control devices
Run enable is the main control signal of the supply unit. The control program reads it from
digital input DI2. You can control the signal, for example, with an operating switch installed
on the supply module cubicle door, and wired to DI2. When the digital input DI2 is on, it is
also possible to control the Run enable signal from a control panel, through fieldbus interface,
or from the inverter unit.
For other control signals, see the firmware manual and the I/O connection diagram.
￭
Main switch-disconnector / breaker
The supply unit is equipped with a main switch-disconnector ([Q1], option +F253) or a main
breaker in high powers ([Q1], option +F255) as standard. With this device, you can isolate
the main circuit of the drive from the power line. The switch has an operating handle on the
cabinet door. The main breaker is withdrawable: to disconnect the drive, crank the breaker
out with a separate loose handle (included in the delivery).
WARNING!
The switch/breaker does not isolate the input power terminals, AC voltage meters
([P5], 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. Especially
in case of a circuit breaker the main circuit breaker does not isolate the charging
circuit. To isolate the charging circuit, use the charging switch [Q3].
Note:
The earthing/grounding switch ([Q9], option +F259) and the main switch-disconnector are
electrically interlocked: only one of the switches can be closed at a time. To close the
switches, you must also have the auxiliary control voltage on.
￭
Auxiliary voltage switch
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
The supply unit can be equipped with an optional grounding switch ([Q9], 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 [Q9] grounds the main AC busbars between the main breaker
and the LCL filter module. It does not ground the input power terminals or auxiliary
circuits.
Note:
The grounding switch and the main switch-disconnector ([Q1], option +F253) are electrically
interlocked: only one of the switches can be closed at a time. To close the switches, you
must also have the auxiliary control voltage on.
Operation principle and hardware description 27
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