nord 6051302, Operating And Assembly Instruction Manual

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Motors – Operating and Assembly Instructions
24 B 1091 en-2722
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2.3 Maintenance intervals
The motor must be checked for unusual running noises and/or vibrations once a week or every
100 hours of operation.
Please check the roller bearings at a minimum interval of 10,000 h and replace them if necessary. The
interval may be shorter depending on the operating conditions.
NOTICE
Bearing damage during inverter operation
During inverter operation, bearing currents can occur under unfavourable conditions, which lead to
damage of the bearings. Damaging bearing currents can be prevented by appropriate technical
measures.
• The effective value of the shaft voltage should not exceed 250 mV.
If necessary, please contact NORD service.
Also check the electrical connections, cables, strands and fans for strength and damages. Check the
function of the insulation system.
Replace the radial shaft seals every 10,000 h.
There must be no dust deposits on the motor’s surface that may impair cooling.
The motor must be completely overhauled at intervals of five years.
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2.4 General overhaul
The motor must be completely disassembled. The following work must be carried out:
• Clean all motor components
• Examine all motor components for damages
• Replace all damaged components
• Replace all roller bearings
• Replace all seals and radial shaft seals
• Perform a winding insulation resistance measurement
The general overhaul must be carried out by qualified personnel in a specialist workshop with
appropriate equipment. We urgently recommend that the general overhaul is carried out by the NORD
Service department.
If the drive unit is used in special ambient conditions, the above-mentioned intervals may be significantly
shorter.
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