WEG W22Xdb - Adjustment of Motor Protection Devices; Electric Connection Checking; Mechanical Installation Checking

36 | Flameproof motors
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ATTENTION
If required by the application, other
protection devices than those given
above may be installed.
5.2.5. ADJUSTMENT OF MOTOR
PROTECTION DEVICES
EX ATMOSPHERE INFORMATION
Motor protection devices for explosive
atmospheres must be always
switched-on, and the adjustments
should be done in accordance with
standards EN/IEC 60079-14. If there is
no other indication, motors are then
designed for S1 service duty
(continuous).
EX ATMOSPHERE INFORMATION
All protections, including the
overcurrent ones, must be adjusted
based on the rated motor conditions.
This protection must also protect the
motor in case of short-circuit (that is, in
case of locked rotor).
Winding with Delta connection must be protected
against single phase. To do that, connect the relay
in series with the winding phases and adjust at 0.58
times the rated current.
ATTENTION
All winding and bearing protections
must be always switched-on and
correctly adjusted.
5.2.6. ELECTRIC CONNECTION CHECKING
- Check periodically if all connections and
terminals inside the terminal box are firmly
made;
- Check if leads passage in the terminal box,
cable gland and terminal box sealing;
- Remove all dust and dirt from terminal box, if
any.
DANGER
Any service on electric machines
should only be carried out when it is
completely stop and all phases
disconnected from the power supply.
6. MECHANICAL INSTALLATION
CHECKING
- Check if all motor fixing bolts are duly fastened;
- Guarantee that flameproof joints are in good
condition (perfectly clean without any
deformation, scratches, marks, etc.) before
closing terminal boxes covers, fixing gland
plates and/or threading cable glands.
Flameproof joints are protected against
corrosion by grease application. Ensure that
this film is kept after exposing a flameproof joint.
See section 3.7.8;
- Check coupling eccentricity, measure axial and
radial clearance and compare such values with
maximum specified values;
- Measure machine vibration levels periodically
and compare results with values given by Table
5-5.
ATTENTION
If motor will remain in stock for long
periods of time without having the
space heater switched-on, water
inside the motor may become
condensed.
EX ATMOSPHERE INFORMATION
Under request the motors may be
equipped with certified drain and
breather valves to avoid the
accumulation of condensed water
inside the motor.
SPACE HEATERS
When motors are fitted with space heaters to avoid
water condensation during long periods of
standstill, the space heaters must be connected so
that they are energized immediately after the motor
is switched-off and are de-energized immediately
before the motor is switched-on. The values of the
space heater supply voltage and power are
informed in the connection diagram and in the
specific plate affixed to the motor.