5 Inspection and maintenance
LS Open Loop Vector Motor 4H42, 4H71, 4H72 Manual Supplement
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June 2022
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5.2
Check the insulation resistance
A check of the insulation resistance after a longer standstill or storage of the system
(> 1 year)! This must be carried out at a winding temperature of +20...+30°C.
Before starting the measurement of the insulation resistance, observe the operating
instructions of the insulation meter used.
1.
Carry out the insulation resistance measurement. The measured voltage is 500 V DC.
–
Minimum insulation resistance for new, cleaned or repaired windings at a refer-
ence temperature of +40°C must be
5 MΩ.
–
The critical specific insulation resistance after long operation time is: 0.5
MΩ/kV.
2.
When reaching or falling below the critical insulation resistance.
Remove the rotor and thoroughly clean and dry the windings of the rotor.
Then carry out another check.
Summary of Contents for 4H42
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