
2.SELECTION METHODS CONFIGURATIONS AND SELECTION B-65332EN/01
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2.3 EXTERNAL COOLING UNIT SELECTION
2.3.1 Overview
To forcibly cool a Dis series motor, an external cooling unit is
required. It is desirable to use a chiller (cooler) for liquid (water)
cooling. The cooling unit to be used must satisfy the "cooling
conditions" listed in "SPECIFICATION LIST" in Part I. If it is
absolutely necessary to use another cooling medium such as oil, note
that the rated continuous force may be reduced by several percent to
several tens of percent due to the difference in characteristics between
oolants. c
For liquid cooling, it is desirable to use a chiller (cooler) which keeps
the room temperature when the ambient temperature of the motor is
not high. If a coolant temperature lower than the motor ambient
temperature is set, condensation may occur on the motor depending on
the ambient condition, resulting in degraded insulation of the motor.
For this reason, when selecting a chiller of which coolant temperature
is fixed, carefully manage the coolant temperature so that no
ondensation occurs. c
NOTE
If any cooling condition listed in Part I,
"SPECIFICATIONS," is not satisfied, the motor
output specifications are not guaranteed.
CAUTION
If condensation occurs on the motor due to
excessive cooling or high humidity, immediately
change the coolant temperature and take other
measures against condensation. In an environment
which keeps condensation for a long time, insulation
of the motor may tend to be degraded, resulting in
considerable reduction of the life of the motor.