USER’S MANUAL

Precautions to be taken with a connected motor
If work must be carried out on a connected motor or on the driven machine, the mains voltage
must always be disconnected from the variable speed drive first. Wait at least 5 minutes
before starting work.
Short-circuits
The Inverter has high voltage parts inside which, if short-circuited, might cause damage to
itself or other property. Place covers on the openings or take other precautions to make sure
that no metal objects such as cutting bits or lead wire scraps go inside when installing and
wiring.
Earth leakage current
This variable speed drive has an earth leakage current which does exceed 3.5 mA AC.
Therefore the minimum size of the protective earth conductor must comply with the local
safety regulations for high leakage current equipment which means that according the
standard IEC61800-5-1 the protective earth connection must be assured by one of following
conditions:
1. Use a protective conductor with a cable cross-section of at least 10 mm 2 for copper (Cu)
or 16 mm 2 for aluminium (Al).
2. Use an additional PE wire, with the same cable cross-section as the used original PE and
mains supply wiring.
Residual current device (RCD) compatibility
This product cause a DC current in the protective conductor. Where a residual current
device (RCD) is used for protection in case of direct or indirect contact, only a Type B RCD is
allowed on the supply side of this product. Use RCD of 300 mA minimum.
Voltage tests (Megger)
Do not carry out voltage tests (Megger) on the motor, before all the motor cables have been
disconnected from the variable speed drive.
Precautions during Autoreset
When the automatic reset is active, the motor may restart automatically provided that the
cause of the trip has been removed. If necessary take the appropriate precautions.
Heat warning
Be aware of specific parts on the VSD having high temperature. Do not touch the Inverter fins,
braking resistors and the motor, which may become too hot during the power supply and for some
time after the power shut-off. Doing so may result in a burn.
Do not Operate the inverter with wet hands
Do not operate the Digital Operator or switches with wet hands. Doing so may result in a
serious injury due to an electric shock.
Omron SX inverter manual 3