ABB ACS850-04 series, Hardware Manual

Page: 14 / 164

Safety instructions
14
Safety in installation and maintenance
Electrical safety
These warnings are intended for all who work on the drive, motor cable or motor.
WARNING! Ignoring the following instructions can cause physical injury or death, or
damage to the equipment:
•
Only qualified electricians are allowed to install and maintain the drive.
•
Never work on the drive, motor cable or motor when main power is applied.
After disconnecting the input power, always wait for 5 min to let the intermediate
circuit capacitors discharge before you start working on the drive, motor or
motor cable.
Always ensure by measuring with a multimeter (impedance at least 1 Mohm)
that:
1. voltage between drive input phases U1, V1 and W1 and the frame is close to
0 V.
2. voltage between terminals UDC+ and UDC- and the frame is close to 0 V.
•
Do not work on the control cables when power is applied to the drive or to the
external control circuits. Externally supplied control circuits may cause
dangerous voltages inside the drive even when the main power on the drive is
switched off.
•
Do not make any insulation or voltage withstand tests on the drive or drive
modules.
Note:
•
The motor cable terminals on the drive are at a dangerously high voltage when
the input power is on, regardless of whether the motor is running or not.
•
The brake control terminals (UDC+, UDC-, R+ and R- terminals) carry a
dangerous DC voltage (over 500 V).
•
Depending on the external wiring, dangerous voltages (115 V, 220 V or 230 V)
may be present on the terminals of relay outputs (X2) or Safe torque off (X6).
•
The Safe torque off function does not remove the voltage from the main and
auxiliary circuits.