NORD Drivesystems B1091 - Manual (Page 7)

www.nord.com B1091-GB-4613 -7-
4. Maintenance, Servicing
Safety measures
Always isolate the motor electrically according to the regulations before commencing any
work on the motor or device, especially before opening covers of live components. In addition
to the main power circuits, any additional or auxiliary circuits must be taken into account.
The standard "5 safety rules", e.g. according to DIN VDE 0105, are:
 Disconnect
 Prevent the equipment from being switched on again
 Check that there is no voltage present
 Earth
and short-circuit
 Cover any adjacent live components or prevent access with barriers
These measures may only be removed when the maintenance work is complete and the
motor has been completely assembled.
Inspect the motors properly at regular intervals. The valid national standards and regulations
must be observed. In particular look for any physical damage, ensure that cooling passages
are free, listen for any unusual noises, and ensure that electrical connections are made in a
proper manner.
With the exception of standardised, commercial or equivalent parts, only genuine spare parts
may be used!
NOTE: If motors are provided with closed 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.
Changing bearings, grease packing
Under normal operating conditions and with the motor installed horizontally, depending on
coolant temperature and motor speed the period for changing bearings in operating hours [h]
on IEC motors with coupling drive is as follows:
25°C 40°C
up to 1800 rpm approx. 40000 h approx. 20000 h
up to 3,600 rpm 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 operating hours
stated above will be reduced considerably.
The motor must be subjected to a general overhaul every 5 years!
General overhaul
For this the motor must be dismantled. The following work must be carried out:
 All components of the motor must be cleaned
 All components of the motor must be examined for damage
 All damaged components must be replaced
 All roller bearings must be replaced
 All seals and shaft sealing rings must be replaced
The general overhaul must be performed in a specialised workshop with appropriate
equipment and by qualified staff. We urgently recommend that the general overhaul is carried
out by NORD Service.