Safety Instructions
iv ACx = ACS/ACCACP ACS/ACC/ACP 601 Frequency Converters
Installation and
Maintenance Safety
These safety instructions are intended for all work on the ACx 601.
Neglecting these instructions can cause physical injury and death.
WARNING! All electrical installation and maintenance work on the
ACx 600 should be carried out by qualified electricians.
Do not attempt any work on a powered ACx 600. After switching off the
mains, always allow the intermediate circuit capacitors 5 minutes to
discharge before working on the frequency converter, the motor or the
motor cable. The voltage between each input terminal (U1, V1, W1)
and earth must be measured with a multimeter (impedance at least
1MΩ) to ensure that the frequency converter is discharged before
beginning work.
All insulation tests must be carried out with the ACx 600 disconnected
from the cabling.
The ACx 600 motor cable terminals are at a dangerously high voltage
when input power is applied, regardless of motor operation. No work on
the motor cable should be attempted with mains power applied.
The brake control terminals (UDC+, UDC-, R+ and R- terminals) carry
a dangerous DC voltage (over 500 V).
There can be dangerous voltages inside the ACx 600 from external
control circuits when the ACx 600 input power is shut off. No work on
the control cables should be attempted when power is applied to the
frequency converter or to the external control circuits. Exercise
appropriate care when working with the unit.
Supply Connections
For ACx 601 a supply disconnecting device must be installed in the
supply, by which the electric parts of the unit can be separated from the
mains network during installation and maintenance work. The supply
disconnecting device must be locked to the open position during
installation and maintenance work.
To meet the European Union Directives the isolator must be of a load
switch type according to EN 60947-3 Class B or of a type that switches
off the loaded circuit by means of an auxiliary contact opening the main
contacts of a switch.
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