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Figure 7. Insulation Resistance vs. Drying Time.
Apply Direct Current
An alternative method of drying the windings
requires direct current. Frequently, welding sets are
available and can be operated in parallel to obtain
the desired current. For suitable drying
temperature, the direct current (DC) should be
about one-half of the rated alternating current (AC)
value specified on the nameplate on the motor.
DO NOT exceed an insulation temperature of
75° C (167° F).
Securely connect the leads of the current
transformer and temperature detectors. Current
flow and the temperature are to be monitored to
protect the motor from damage.
The current MUST BE LIMITED so that the
maximum temperature of the windings do not
exceed 85° C (185° F).
The insulation resistance drops rapidly initially as
the winding heats up, then rises slowly as the
moisture is driven off, and finally levels off at a
steady value. Drying may be concluded when a
fairly steady value of insulation resistance is
reached.
Lubrication
Frames 80 – 180 are manufactured with double
shielded ball bearings that are lubricated with
Mobile Polyrex ® EM grease prior to installation.
Grease fittings are not supplied and bearings are
designed for a typical MTBF of 100,000 hours
operation under standard conditions (see
on page
17).
https://www.toshiba.com/tic/
EQP Global IEC Series Low-Voltage 50/60 Hz Metric Motor
Frames 200 – 225 are manufactured with double
shielded open ball bearings. Depending on the kW
size and/or the operating speed, it may be
necessary to relubricate anti-friction bearings
periodically (see
These motors are supplied with provisions for
greasing and have been lubricated prior to shipping.
However, before start up, it is recommended that
approximately 1 oz. (30 grams) of grease be
applied because of the possibility of grease settling
during storage. Any oil leakage around bearing
caps indicate over packing — excess grease should
be purged by operating motor temporarily with the
relief plug open.
Lubricating Instructions
Frames 200 – 225 are furnished with grease
fittings. Before greasing, ensure that the fittings are
clean and free of dirt.
Remove the grease relief plug or plate and, using a
low pressure grease gun, pump in the required
grease amount. Do not over grease. Relubrication
intervals are specified in
After relubricating, allow the motor to run for 10
minutes before replacing relief hardware.
See the Motor Relubrication document #MDS-O-
0001 for details on both standard horizontal and
vertical motor bearings.
Recommended Greases for Standard
Applications
Minimum Ambient Temp. -60° C (-76° F)
Mobil Polyrex
®
Chevron
Mobil Unirex
Shell Dolium
Mobilith SHC
Unless otherwise specified by the grease
nameplate on the motor, use the following greases
for the listed temperature range. The EQP Global
IEC Series Low-Voltage 50/60 Hz Metric Motors are
greased at the factory with the polyurea base Mobil
Table 1
Polyrex ® EM grease.
Maintenance
Table 1 on page
17).
Table 1 on page
®
Exxon Mobil Corp.
EM
Chevron Corp.
SRI 2
®
Exxon Mobil Corp.
N 2
®
Shell Oil Co.
R
®
Exxon Mobil Corp.
100
17.
15
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