ACS/ACC/ACP 601 Frequency Converters 3-1
Chapter 3 – Electrical Installation
WARNING! The electrical installation described in this chapter should
only be carried out by a qualified electrician. The
Safety Instructions
on
the first pages of this manual must be followed. Negligence of these
instructions can cause injury or death.
Insulation Checks
Every ACx 600 unit has been tested for insulation between main circuit
and chassis (2500 V rms 50 Hz for 1 second) at the factory. Therefore
there is no need to check the insulation on the unit again. When
checking the insulation of the assembly, proceed in the following
manner:
WARNING! Insulation checks must be performed before connecting
the ACx 600 to the mains. Before proceeding with the insulation
resistance measurements make sure that the ACx 600 is disconnected
from the mains.
1. Check that the motor cable is disconnected from the ACx 600
output terminals U2, V2 and W2.
2. Measure the insulation resistances of motor cable and the motor
between each phase and Protective Earth with measuring voltage
1 kV d.c. The insulation resistance must be greater than 1 MΩ.
Mains Fuses
Fuses are needed to protect the input bridge of the ACx 600 in case of
an internal short circuit. The ACx 601 is not equipped with input fuses.
When installing the ACx 601, it is recommended to connect the supply
via ultrarapid fuses introduced in
Appendix A
. For types
ACx 601-0030-3 and -0040-5 and larger, ultrarapid fuses must always
be used.
If a fuse is blown, it must not be replaced with a normal slow fuse rated
according to
Appendix A
. An ultrarapid fuse must be used.
The ACx 600 protects the input and motor cables from overload when
the cables are dimensioned according to the nominal current of
ACx 600. When the ultrarapid fuses of ACx 601 are placed at the
distribution board, they protect the input cable in case of a short circuit.
PE
Ω
M
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