18 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!
• 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. there is no voltage between the drive input phases U1, V1 and W1 and the
ground
2. there is no voltage between terminals BRK+ and BRK- 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 carry dangerous
voltage even when the input power of the drive is switched off.
• Do not make any insulation or voltage withstand tests on the drive.
• Disconnect the internal EMC filter when installing the drive on an IT system (an
ungrounded power system or a high-resistance-grounded [over 30 ohms] power
system), otherwise the system will be connected to ground potential through the
EMC filter capacitors. This may cause danger or damage the drive. See page 48.
Note: When the internal EMC filter is disconnected, the drive is not EMC
compatible without an external filter.
• Disconnect the internal EMC filter when installing the drive on a corner-grounded
TN system, otherwise the drive will be damaged. See page 48. Note: When the
internal EMC filter is disconnected, the drive is not EMC compatible without an
external filter.
• All ELV (extra low voltage) circuits connected to the drive must be used within a
zone of equipotential bonding, ie within a zone where all simultaneously
accessible conductive parts are electrically connected to prevent hazardous
voltages appearing between them. This is accomplished by a proper factory
grounding.
Note:
• Even when the motor is stopped, dangerous voltage is present at the power
circuit terminals U1, V1, W1 and U2, V2, W2 and BRK+ and BRK-.
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