Hardware Manual

14 Safety instructions
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 minutes 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:
• voltage between drive input phases L1, L2 and L3 and the frame is close
to 0 V
• 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.
• Do not connect the drive to a voltage higher than what is marked on the type
designation label. Higher voltage can activate the brake chopper and lead to
brake resistor overload, or activate the overvoltage controller what can lead to
motor rushing to maximum speed.
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 DC terminals (UDC+, UDC-) carry a dangerous DC voltage (over 500 V)
when internally connected to the intermediate DC circuit.
• Depending on the external wiring, dangerous voltages (115 V, 220 V or 230 V)
may be present on the terminals of relay outputs (XRO1, XRO2 and XRO3).
• The Safe torque off function does not remove the voltage from the main and
auxiliary circuits. The function is ineffective against deliberate sabotage or
misuse.