Omron SX inverter manual

Condensation
If the variable speed drive is moved from a cold (storage) room to a room where it will be
installed, condensation can occur. This can result in sensitive components becoming damp.
Do not connect the mains voltage until all visible dampness has evaporated.
Grounding the inverter
Be sure to ground the unit. Not doing so may result in a serious injury due to an electric
shock or fire.
Power factor capacitors for improving cos
Remove all capacitors from the motor and the motor outlet.
Incorrect connection
The variable speed drive is not protected against incorrect connection of the mains voltage,
and in particular against connection of the mains voltage to the motor outlets U, V and W.
The variable speed drive can be damaged in this way.
Stop motion mechanical device to ensure safety
The inverter controls the motor electrically, but has no means to stop it mechanically under
some types of failures... In applications where mechanical stop is required to a degree of
safety, a safety assurance study should be carried out to determine the need of additional
mechanical braking devices.
Braking resistor and regenerative braking units
In case the application needs it, be sure to use a specified type of braking resistor/regenerative
braking unit. In case of a braking resistor, install a thermal relay that monitors the temperature
of the resistor. Not doing so might result in a burn due to the heat generated in the
braking resistor/regenerative braking unit. Configure a sequence that enables the Inverter
power to turn off when unusual overheating is detected in the braking resistor/regenerative
braking unit.
Electric protection of installation
Take safety precautions such as setting up a molded-case circuit breaker (MCCB) or fuses
that matches the Inverter capacity on the power supply side. Not doing so might result in
damage to property due to the short circuit of the load.
Wiring works and servicing the inverter
Wiring work must be carried out only by qualified personnel. Not doing so may result in a
serious injury due to an electric shock. Do not dismantle, repair or modify this product if
you’re not authorised and qualified for it. Doing so may result in an injury.
DC-link residual voltage
After switching off the mains supply, dangerous voltage can still be present in the VSD.
When opening the VSD for installing and/or commissioning activities wait at least 10 minutes.
In case of malfunction a qualified technician should check the DC-link or wait for one
hour before dismantling the VSD for repair.
Opening the variable speed drive cover
Only qualified technician can open the inverter. Always take adequate precautions before
opening the inverter. Although the connections for the control signals and the switches are
isolated from the main voltage, do not touch the control board when the variable speed drive
is switched on.
Do not manipulate inverter under power
Do not change wiring , put on or take off optional devices or replace cooling fans while the
input power is being supplied. Doing so may result in a serious injury due to an electric
shock. Inspection of the Inverter must be conducted after the power supply has been
turned off. Not doing so may result in a serious injury due to an electric shock. The main
power supply is not necessarily shut off even if the emergency shutoff function is activated.
2 Omron SX inverter manual