The electric machines are designed to work properly with water based coolant. Plain water with
appropriate corrosive inhibitor is acceptable, for example 50 % water- 50 % glycol coolant. Use
ethylene glycol (GlysantinG48 is recommended).
The electric machines are designed to work properly with water based coolant. Plain water with
appropriate corrosive inhibitor is acceptable, for example 50 % water- 50 % glycol coolant.
Other options:
Propylene glycol based coolants, like Splash® RV&Marine antifreeze.
Ethylene glycol based Glysantin® G48® (includes also corrosion inhibitors).
Emergency operation
The electric machine should be operated within the operation limits and in the conditions
speci ed by the manufacturer. However, it can be limitedly used in the following fault/ emergency
situations.
Cooling of the electric machine fails
The cooling system failure can be caused by dregs (sediment) accumulating to the cooling system
tubes. Try opening the possible blockage by changing the coolant ow direction. See also Chapter
Cooling system maintenance
.
If the cooling of the electric machine fails, limited operation is still possible with no coolant ow.
The operation speed must be limited to half (1/2) of the rated speed and maximum 20 % of the
nominal torque may be used. In such case, the electric machine may be operated for maximum
one hour. Repair the cooling system as soon as possible. For further information, contact
Danfoss representative.
The temperature measurement of the electric machine fails
The operation temperature of the electric machine is measured by PT100 temperature sensors in
the electric machine windings. The temperature signals can be read out from the measurement
connector of the electric machine, and connect to the temperature surveillance pin in the inverter
for example. In case of a temperature measurement sensor failure in the electric machine, an
additional PT100 sensor can be mounted close to the end of the windings at the low voltage
(measurement signal) connector opening.
1. Remove the low voltage (measurement signal) connector from the electric machine enclosure.
Be careful not to damage the cables and joints.
2. Mount (glue) an additional PT100 temperature sensor close to the end of the windings at the
opening. Use resin/glue speci ed for correct temperatures (Temp.class in the rating plate, class
F / 155 ºC).
3. Connect the PT100 sensor to the low voltage connector (replace the failed sensor connection
by the new connection).
4. Remount the low voltage connector to its place.
When reading the temperature (resistance) values from the additional sensor, add +15 ºC to the
measured value. This gives more correct estimation of the inner temperature of the machine. In
case of the temperature measurement failure and using additional temperature sensor, replace
the electric machine as soon as possible, but no later than in two months.
Contact the Danfoss service.
EM-PMI375
7. Operation
54 |
©
Danfoss | Produced By: Danfoss Power Solutions | January 2019
| BC265856307805en-000105
Summary of Contents for EM-PMI375-T200
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