Operating Instructions ACU
7.5.4 Size 6 ACU 401 (37.0 to 65.0 kW)
Disconnect the frequency inverter from mains voltage and protect it against being
energized unintentionally.
Verify safe isolation from power supply.
Work on the device may only be started once the DC link capacitors have discharged.
The time to wait is at least 3 minutes in the case of size 6.
When the frequency inverter is disconnected from power supply, the mains, DC-link
voltage and motor terminals may still be live for some time.
Switch off power supply before connecting or disconnecting the mains cable to/from
terminal X1, the motor cables and the brake resistor to/from terminal X2.
The following illustrations show the air-cooled variant of an ACU 401 frequency inverter size 6 as an
example. Illustrations of the corresponding liquid-cooled device are given in the “Operating
Instructions Liquid Cooling Supplemental”. The electrical interfaces for both variants are basically te
same.
Mains connection ACU 401 (37.0 to 65.0 kW)
wire cross section up to 70 mm
37.0 kW … 65.0 kW
threaded bolt M8x25
+
-
L1
L2L3L1
L2 L3 PE
3ph / 400V AC
X1
X1
8 Nm
70.8 lb-in
2
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