Nord Drivesystems B1091 - 4. Maintenance and Servicing

www.nord.com B1091-GB-3212 -7-
4. Maintenance
Servicing
Safety precautions
Before commencing any work on the motor or device, but especially before opening covers in
front of live components, always isolate the motor electrically according to the regulations.
Apart from the main circuits also isolate any additional or auxiliary circuits.
The standard "5 safety rules", e.g. according to DIN VDE 0105, are:
 Isolate electrically
 Prevent equipment from being switched on again
 Check that there is no voltage
 Earth and short-circuit
 Cover any adjacent live components or prevent access with barriers
The above precautions may only be withdrawn when the maintenance work has been
completed and the motor is fully assembled.
Inspect the motors properly at regular intervals. In particular look out for any physical damage,
ensure that cooling passages are free, listen for any unusual noises, and ensure that electrical
connections are performed in a proper manner.
With the exception of standardised, commercial or equivalent parts the only spare parts which
may be used are genuine spare parts!
NOTE: Inasmuch as motors are provided with enclosed condensation ports, they must be
opened from time to time so that any accumulated condensation can drain off. Condensation
ports are always positioned at the lowest point of the motor. When installing the motor ensure
that the condensation holes are at the bottom.
Bearing changes, grease filling
The period for changing bearings in operating hours [h] on IEC motors with coupling drive is
as follows, under normal operating conditions and with the motor installed horizontally,
depending on coolant temperature and motor speed:
25°C 40°C
up to 1800 min
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1
approx. 40000 h approx. 20000 h
up to 3600 min
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1
approx. 20000 h approx. 10000 h
In the case of direct gearbox attachment or under special operating conditions, e.g. vertical
motor, substantial vibrations or shock loads, frequent reversing, etc. the above-mentioned
operating hours will be reduced considerably.
The motor must be subjected to a general overhaul every 5 years!
General overhaul
For this purpose the motor must be dismantled. Perform the following work:
 Clean all parts of the motor
 Inspect all parts of the motor for damage
 Replace all damaged parts
 Replace all antifriction bearings
 Replace all gaskets and shaft seals
The general overhaul must be performed in a specialised workshop with appropriate
equipment and by qualified staff. We urgently recommend having the general overhaul
performed by NORD Service.