Safety 5
1. 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 make sure by measuring with a multimeter (impedance at least 1 Mohm)
that there is no voltage between the drive input phases U1, V1 and W1 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 17.
Note: When the internal EMC filter is disconnected, the drive is not EMC
compatible.
• Disconnect the internal EMC filter when installing the drive on a corner-grounded
TN system, otherwise the drive will be damaged. See page 17.
Note: When the internal EMC filter is disconnected, the drive is not EMC
compatible.
• All ELV (extra low voltage) circuits connected to the drive must be used within a
zone of equipotential bonding, in other words, 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.
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