-6- B1092-GB www.nord.com
4. Maintenance
Safety measures
Before starting any work on the motor or the device, but especially before opening the covers
of active components, the motor must be isolated according to regulations. In addition to the
main power circuits, any additional or auxiliary circuits must be taken into account.
The usual "5 Safety Rules" e.g. according to EN 50110-1 (DIN VDE 0105) are:
• Isolate,
• Secure against switching on,
• Check for no voltage,
• Earth and short circuit,
• Cover or fence off neighbouring live components.
These measures may only be removed when the maintenance work is complete and the
motor has been completely assembled.
NOTE: If the motors are designed with closed condensation outlets, these must be opened
occasionally in order to allow any accumulated condensation to drain off. Condensation
outlets must always be located at the lowest point of the motor.
Changing bearings, grease packing
Bearing replacement period [h] under normal operating conditions, with horizontal installation
of the motor, cooling medium temperature or motor speed:
40°C
up to 1800 min
-1
approx. 40000 h
up to 3000 min
-1
approx. 20000 h
NOTE: The permissible axial and transverse forces must not be exceeded.
Independent of the hours of operation of a motor which is in use, the roller bearing should be
replaced approximately every 3 years due to the reduction of lubrication.
Under special operating conditions, e.g. vertical motor installation, heavy loads due to
vibration and shock, or operation with frequent reversing, the operating hours stated above
are significantly reduced.
The motors have groove ball bearings with cover plates (2ZC3 design). The material of the
plates should be temperature resistant from -30°C to +150°C, e.g. polyacrylic rubber (ACM).
Grease types for standard machines: UNIREX N3 (ESSO); Substitute greases must comply
with
DIN 51825-K3N:2004.
Special greases are indicated on the rating plate or on an additional plate.
Dismantle the motor to the necessary extent. Remove the roller bearing using suitable
equipment (see Fig. 6). Clean any contamination from the bearing seats.
Uniformly heat the roller bearings to approx. 80-100°C and fit. Hard blows (e.g. with a
hammer) must be avoided.
Any warn sealing elements (e.g. shaft seals) must also be renewed. If shaft sealing rings
without springs are installed, the replacement component must also be installed without
springs.
Centring edge seal
When assembling the motor, the bright fitting surfaces between the motor housing and the
bearing covers must be sealed with a suitable non-hardening sealing compound, e.g. Fluid-D.
Tightening torques for the screws on the bearing covers: see Fig. 4.2.
Regreasing device
For motors with regreasing devices, the details on the lubrication plate or the rating plate must
be observed. Regreasing should be performed with the motor running.
(184 pages)
(184 pages)
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