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Connection
6.
Maintenance and repair
Careful and regular maintenance and inspections are required to recognise and remedy troubles in good times,
before they lead to major damage.
6.1
Maintenance intervals
Safety at main-
Since the operating conditions of the motors differ considerably, only general maintenance intervals to ensure
trouble-free operation can be specified. They need to be adapted to the local conditions such as the actual level
of contamination, numbers of starts, load, etc. The radial groove ball bearings of the motor are lubricated for life
and are designed for nominal service life of 20,000 hours. Motors with shaft sealing ring must be mounted tog-
ether with gears which prevent dry running of the shaft sealing ring. Otherwise it comes to screeching noises and
overheating of the motor by increased friction.
depending on the local level of con-
•
tamination
depending on the operating mode
•
every 50 to 500 operating hours
after approx. 500 operating hours,
•
but after 1 year at the latest
GB - 24
Repairs may only be carried out by the manufacturer or an authorised repair agen-
Repairs
cy. Unauthorised opening and tampering may lead to bodily injury and property
damage and may entail the loss of warranty rights.
Before starting any work on the motors, and particularly before opening any covers
of active parts, make sure that the motor and plant have been properly isolated.
This refers also to any additional or auxiliary circuits !
The „5 safety rules" to be applied according to DIN VDE 0105 are:
• Disconnect the motor
tenance
• Secure against restarting
• Verify the safe isolation from supply
• Earth and short (at voltages above 1000 V)
• Safeguard or cover adjacent live parts.
Clean the motor
Regrease the optional rotary shaft seal ring (applies only to grease
lubrication !)
Retighten the electrical and mechanical connections.
check for deterioration of running smoothness or bearing noise.
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