Siemens SIMOTICS GP Operating Instructions Manual page 92

INSULATION RESISTANCE MEASUREMENT
Measure insulation resistance and register it periodically (approx.
every 5000 operating hours). A portable insulation meter (Megger) for 500
DCV is the most convenient and safest method. According to IEEE (Institute
of Electrical and Electronics Engineers) standards, the insulation resistance
at 75°C measured at 500 V.D.C. after one minute should be not less than:
Nominal motor voltage + 1000
1000
This formula is satisfactory for most of the checks. For more
information see IEEE standard No. 43 "Recommended Practice for
Insulation Resistance Testing of AC Rotating Machinery".
WARNING:
Therefore, severe injuries can be caused if tests are not carried out by
qualified personnel with adequate tools.
CLEANING AND DRAINING
CAUTION:
moisture, chemical agents, or any other accumulation that would provoke a
faulty cooling of the equipment. For fan cooled motors, it is particularly
important to keep the air intake openings free of foreign material. Do not
block air outlet or inlet. The motor (excluding explosion proof models) has a
removable plug, in the low part of the housing, which allows draining
accumulated humidity. Drain regularly.
ADDITIONAL PAINTING
Please contact your local SIEMENS sales office for information about
additional painting.
MOTOR DISPOSITION ONCE PRODUCTIVE LIFE FINISHED.
Your motor has materials that can be recovered or recycled. The
right separation of materials helps with an easy recycling of important
materials. Leave your equipment or electrical product at a collection point.
Contact your local authorities for more information on disposal of electrical
.
equipment
Unrestricted
Insulation resistance in Mega ohm
=
High DC voltage levels are used during this test.
All surfaces of the motor must stay free of oil, dust, dirt,
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