TM 5-3895-374-24-1
Standard Motor Circuit Protector (MAG-GARD) Circuit ?Breaker Application Information
I-22
The Canadian Electrical Code requires that
magnetic starters, used in combination with
adjustable magnetic trip only circuit breakers,
have an overload relay in each conductor.
The adjustable magnetic trip setting will be set at
"LO" by the factory The user may need to adjust
this setting for proper motor start-up The 700%
and 1300% of full load current (FLI) set point
limits are outlined in RULE 28-210 of the C E
Code 1982.
After obtaining the motor FLI from the motor
name-plate, the user may then select the
adjustable trip setpoint of 700% FLI to test-start
the motor. Further adjustments may be required
for motor load characteristics (not to exceed
1300% FLI). NOTE MAG-GARD circuit breakers
are selected from the MAG-GARD selection
table in the Square D Digest.
MAINTENANCE
WARNING: Turn off power ahead of motor
control center before performing any of the
following operations. Discharge capacitors, if
present. Positively ascertain that equipment is
totally de-energized by using an appropriate
instrument, such as a voltmeter. When separate
control circuits exit, ascertain that they are also
de-energized.
M-l
The following maintenance procedure should be
followed before energizing any new motor
control center equipment Regular maintenance
should be performed at least annually or more
frequently depending on service conditions or
established maintenance policy. Maintenance
should also be performed following any service
electrical fault or unusual occurrence.
Enclosure
M-2
Examine the interior and exterior of the motor
control center for signs of moisture, oil or other
foreign material. If present, eliminate the source
of foreign material and clean the motor control
center.
Clean the interior and exterior of the motor
control center with a vacuum cleaner Do not use
compressed air, as it will only redistribute
contaminants to other surfaces. Check the
enclosure for any damage that might reduce
electrical clearances.
M-3
Examine the finish of the enclosure Touch up
the paint if necessary Replace any badly
corroded or damaged enclosure parts.
(page 3-131)
