8 Safety
Safety in installation and maintenance
These warnings are intended for all who work on the drive, motor cable or motor.
Electrical safety
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!
• Be sure the system is properly earthed/grounded before applying power. Do not
apply AC power before earths/grounds are connected.
• Never work on the drive, motor cable or motor when input 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:
1. Voltage between drive input phases L1, L2 and L3 is close to 0 V.
2. Voltage between terminals UDC+ and UDC- and the frame is close to 0 V.
3. There is no voltage between terminals R+ and R– and the ground.
• 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.
• If a drive whose varistors are not disconnected is installed on an IT power system
(an ungrounded power system or a high resistance grounded [over 30 ohms]
power system), the drive will be connected to earth potential through the varistors.
This may cause danger or damage the drive.
• If a drive whose varistors (built-in) or mains filter (external option) are not
disconnected is installed on a corner-grounded TN system, the drive will be
damaged.
• Suitable for use on a circuit capable of delivering not more than the RMS
symmetrical short circuit amperes listed here, at the rated maximum voltage
(480 V AC):
Horsepower: 1-60 RMS symmetrical amperes: 100,000
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.
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