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4.8 INITIAL START UP
WARNING!
During the measurement, and immediately afterwards,
some of the terminals are at hazardous voltage levels and must not be
touched. Carry out a check with the power cables connected that no
voltage can be applied.
CAUTION! Prior to initial start-up check the following:
• Insulation resistance of motor winding to earth to be over
1 MΩ for motors up to 600V and over 10 MΩ for over 600V.
• Thermistors or RTDs if fitted, should be checked for continuity
with a multimeter.
• Ensure thermistors are wired up to the motor protection
relay as to trip the supply to the motor in the event of an over
temperature.
• Do not insulation resistance test thermal protective devices
across their terminals. Short the entire protector leads
together and apply the test voltage between the shorted
leads and earth and/or phases.
• Hazardous location motors supplied by a Variable Voltage
Variable Frequency (VVVF) drive must have the thermal
protection devices connected into the motor control circuit in
such a manner as to disconnect the source of supply in the
event of an over temperature, thus preventing the nominated
temperature class from being exceeded.
• Anti-condensation heaters, if provided, must be so connected
as to switch on when the motor supply is disconnected and
switch off when the motor supply gets connected.
• Ensure that the supply voltage and frequency correspond to
the motor nameplate ratings.
• Ensure shaft turns freely before initial start.
• Measure winding resistance between supply terminals and
record in the log book.
5.0 OPERATION
WARNING! Prior to initial start up check the following:
• Before energizing the motor make sure that the terminal
box lid is closed and secured with appropriate clearance to
live parts. Make sure that appropriate earthing is done.
• If an earthing ring and earth brush are provided, make sure
that the earthing ring is clean and the earth brush makes
a good contact with the earthing ring. This applies for the
Safe Area motors.
• Make sure of no loose objects around that may be sucked by
the cooling fan on the motor.
CAUTION! Prior to initial start up check the following:
• Make sure that the coupling and/or transmission is adequately
guarded for safety.
• Check the mounting bolts and/or flanges are firmly secured.
• Make sure that the load applied is within the nameplate
specification.
• Make sure that the ambient temperature is inside 40ºC or as
per nameplate specification.
• If an Adjustable Speed Drive is used on Ex nA motor, follow
the instructions on additional nameplate for converter supply
in respect to applied load and frequency.
• Check that the running current on no load and full load are
reasonably balanced within 10% of the average and record
the figures in the log book for future reference. Note that the
current imbalance can be higher, typically 10 times the voltage
imbalance if there is an imbalance in supply voltage.
• Brake motors used in hazardous locations must have a limited
number of repeat stops to 20 per hour.
8
©2019, 2020 Regal Beloit Corporation, All Rights Reserved. MCIM2022E • Form# SB0250E
6.0 MAINTENANCE
A motor needs regular maintenance. Exact maintenance needs
vary based on the site conditions. To obtain reliable service from the
motor, the following maintenance schedule may be used as a guide.
WARNING! An authorised service agent must carry out
maintenance of hazardous location motors. Clean the surface of
the motor with a damp cloth to minimise the risk of electrostatic
discharge.
A. Ensure air intake space is unobstructed.
On a weekly basis use an air hose to ensure all air ways are
B.
clear and free of dust.
C. Once every month, check motor for condensation. Replace
drain plugs before starting if they are blocked or found missing.
D. Do not wash the motor down unless it is IP66 rated.
On a quarterly basis-
E.
i.
Check the motor terminals for tightness and proper contact.
ii.
If terminal lug/s are discoloured, re-terminate with fresh lugs.
iii.
Check operation of starting equipment, ensuring all
terminations are tight.
iv. Check mechanical operation of thermal overload
relays, if any.
v.
Check mechanical operation of thermistor relays, if fitted.
vi. Check operation of anti-condensation heaters, if fitted.
vii. Check the earth ring and earth brush length, if fitted (For
Safe Area Motors).
F.
On a biannual basis, in addition to the items in 'E'
i.
Check winding resistance between supply terminals
and compare to original value and enter in log book.
ii.
Check supply voltage at motor terminals and record in
log book.
iii.
Check bearings for abnormal noise/overheating.
G. On an annual basis, in addition to the items in 'E' and 'F' above
i.
Re-grease the bearings as recommended under
Lubrication & Bearings.
ii.
Completely disassemble stator and rotor and clean
thoroughly.
iii.
Check bearings for wear/damage – replace as necessary.
iv.
Check all bolts and nuts for cracks or damage – replace
as necessary.
v.
Check all holding down bolts for signs of fatigue or
damage – replace as necessary.
vi. After re-assembly, check and record in the log book –
Insulation resistance;
No load current and voltages;
Full load current and voltages;
Compare these figures with the original records in
the log book.
vii. Check and ensure that the cooling fan is operational.
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