Electrical Connection - EBARA GS Instruction Manual

4. Electrical connection

Warning
Caution
Check that the motor is cooled properly, by leaving the air inlets and outlets unobstructed. Our
recommendation is to install the equipment in a ventilated place away from any heat source.
The condensate drainage outlets must be in the lower part of the motor. The drainage caps can be
removed if this does not jeopardize the protection of the motor.
All electrical connections of the equipment must be carried out by qualified personnel with the power
supply switched off.
- Use power supply cables that are adequately sized to carry the maximum current absorbed by the motor,
in addition to the margin set by local requirements; this will avoid any overheating and/or voltage drops
(voltage drops must be less than 4% during the start-up phase).
- Make sure the cables reach the terminal box with a curve that prevents water from getting in and
running over them.(Fig.4)
- The contact surfaces of the connections must be clean and protected against rust. Do not place any
washers or nuts between the terminals on the motor and those providing access to the mains.
- Check the airtight sealing of the cable gland so as to ensure the degree of protection indicated on the
nameplate.
- Avoid any mechanical stress being transferred to the motor terminals.
- Comply with the current and frequency limits indicated on the nameplate of the motor.
- It is advisable to install a switch in order to prevent any accidents involving electrical discharges, and
also a protection against power surges for motors with the aim of avoiding any damage due to
overheating.
- Terminal voltage in motors bearing may be within ±10 % of the rated voltage, exceeding this range will
be lead to breakdown.
Note
Perform wiring work correctly as specified by electrical facility
technical standards and extension codes. Incorrect wiring could
result in electric shock and fires.
Install and ground an earth cable. Electric shock could occur
during accidents or electric leakage.
Make sure that any one of three terminals of the three-phase
motor are not lose or disconnected. Running the motor with only
two terminals connected could a phase interruption, burning out
the motor.
The motor manual must be read and completely understood by
the specialist personnel/ operators responsible prior to
installation and operation of the motor.
Fig.4 Curve of the Cable
The correct direction of rotation is clockwise when looking from the motor
side.
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