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Design
See also “Electrical connections” and separate instruc-
tions for starter equipment.
The machine can be equipped with sensors, CLS for
sensing water in the oil and/or FLS for sensing water
in the stator casing. The CLS sensor is not applicate
for Ex-approved machines.
NOTE! 4630 and 4640 can only be equipped with FLS.
4. Shaft
The motor shaft is delivered with the rotor as an inte-
gral part.
The motor shaft is completely sealed and will not
come in contact with the liquid.
5. Shaft seals
Mechanical face seals plug-in type, which combines
an inner and an outer seal into one, rigid unit.
6. Bearings
The shaft is carried in one single-row angular contact
ball bearing and a single-row cylindrical roller bearing
together with a single-row angular contact ball bearing.
The bearings are dimensioned for more than 100 000
(L 10 aa) hours of operation.
7. Oil casing
The oil lubricates and cools the seals and acts as an
additional barrier against penetrating liquid.
Pressure build-up within the oil casing is reduced by
means of a built-in air volume.
Cable entry
The cable entry has two compressible rubber bush-
ings to seal off and to relieve the cable.
1. Junction box
The junction box is completely sealed off from the
surrounding liquid and the stator casing.
2. Motor
Squirrel-cage 3-phase induction motor for 50 Hz or 60
Hz.
The motor is started by means of direct on-line start.
The motor can be run continuously or intermittently
with a maximum of 15 evenly spaced starts per hour.
The stator is insulated in accordance with class H
(180°C, 355°F). The motor is designed to supply its
rated output at ± 5 % variation of the rated voltage.
Without overheating the motor, ± 10 % variation of the
rated voltage can be accepted provided that the motor
does not run continuously at full load. The motor is
designed to operate with a voltage imbalance of up to
2 % between the phases.
3. Monitoring equipment
The stator incorporates three thermal contacts con-
nected in series.
The thermal contacts open at 125°C (260°F).
NOTE! The thermal contacts should be connected for
liquid temperature up to 40°C (105°F) and always for
Ex approved machines.
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