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36 Operation principle and hardware description
5
Memory unit
6
Connection for FSO safety functions module
7
Control panel and PC connection
8
Terminal blocks on the inverter control unit.
9
Fiber optic link to each inverter module. Similarly, each supply module is connected to the supply
control unit by fiber optic cables.
10
Terminal blocks for customer connections installed in the drive cabinet.
11
Supply unit (consisting of one or more supply modules)
12
DC intermediate link
13
Inverter unit (consisting of one or more inverter modules)
14
Optional brake chopper (+D150) and resistors (+D151)
Door switches and lights
Main disconnecting device [Q1]
￭
The drive is equipped with a main circuit breaker [Q1]. Units with 12-pulse supply connection
(option +A004), as well as some of the largest 6-pulse types, have two breakers, [Q1.1] and
[Q1.2]. To close the main breaker, auxiliary voltage must be switched on, and the grounding
switch (if present) must be open.
By racking out the breaker, you can isolate the main circuit of the drive from the power line.
WARNING!
The main disconnecting device does not isolate the input power terminals, AC voltage
meters, or the auxiliary voltage circuit from the power line. To isolate the auxiliary
voltage circuit, open the auxiliary voltage switch [Q21]. To isolate the input power
terminals and AC voltage meters, open the main breaker of the supply transformer.
Auxiliary voltage switch [Q21]
￭
The auxiliary voltage switch controls the supply to the internal auxiliary voltage transformers.
The transformer feeds the control circuits inside the drive such as cooling fans, relays and
measuring equipment.
Note: Frame 1×R8i+1×R8i units are not fitted with an auxiliary voltage switch. The auxiliary
voltage is switched on and off by the main disconnecting device [Q1], and protected by fuse
disconnectors F20.1...F20.3.
Grounding (earthing) switch [Q9], optional
￭
The grounding switch [Q9] (option +F259) connects the main AC power bus to the PE
busbar.
To close the grounding switch, auxiliary voltage must be switched on, and the main
disconnecting device must be open.
WARNING!
The grounding switch does not ground the input power terminals of the drive or the
auxiliary (control) voltage circuits.
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