Synchronous motors (PMSM) – Manual with installation instructions
30
B 5000 en-2621
4 Commissioning
4.1 Check encoder
Check the alignment of the rotary encoder.
If the rotary encoder is not aligned, or has come out of adjustment due to an impact or removal of the
motor, the zero track of the encoder must again be adjusted to the rotor position. For more
information, refer to the operating instructions of the encoder and the frequency inverter.
4.2 Check insulation resistance
WARNING
Danger of electric shock
The motor terminals still carry hazardous voltages also after the insulation resistance has been
checked.
• Do not touch the terminals during or shortly after the check.
Prior to initial commissioning of the motor and after a long period of storage or standstill (approx. 6
months) the insulation resistance of the windings must be checked.
The insulation resistance of new, cleaned, repaired windings against the housing and against each
other is > 200
MΩ.
Measure the insulation of the windings against the housing for operation voltages up to 400 V with
500 V DC. For operation voltages up to 725 V, measure with 1000 V DC. The temperature of the
windings should be 25°C ± 15°C.
For new or cleaned windings or repaired motors, which have been stored or not used for long periods,
the insulation resistance of the winding against earth can be less than 10 M
Ω
. This may be due to
moisture. Dry the windings.
The insulation resistance may reduce after long periods of operation. As long as the measured value
does not fall below the calculated value for the critical insulation resistance of < 50
MΩ, operation of
the motor may continue. If this value is undershot, determine the cause. Repair, clean and dry the
windings or winding parts, if necessary.
4.3 Check the motor
Before commissioning, check the motor for correct function after installation.
If a change in the power consumption, higher temperatures or vibrations, unusual noises or odours
etc. occur or a monitoring system responds, the motor function is impaired. Immediately inform the
maintenance personnel responsible to avoid personal injury or material damage.
If in doubt, switch off the motor without delay.
4.4 Check the brake (option: BRE)
Check the correct function of the brake.
