Commissioning
4.2 Danger and warning notices
A5E01083943A AB
60 Siemens AG Operating Instructions 2.02 1FW4
4.2 Danger and warning notices
Dangerous voltage at the motor terminals when the rotor is rotating
WARNING
Dangerous voltage at the motor terminals when the rotor is rotating
There is always a magnetic flux in the motor due to the permanent magnets in the rotor.
With each rotation of the rotor, a voltage occurs at the motor terminals. As a result of this,
there is also a voltage at the converter output terminals via the connecting cable. When
working on the drive system, you must prevent any rotational movement of the motor shaft.
Dangerous voltage via the converter
WARNING
Dangerous voltage via the converter
As long as the feeding converter is switched on, or the DC link of the converter is not
discharged, there can be a voltage at the motor terminals even when the rotor is not
moving. Depending on the type of converter, the voltage can be up to 1,000 V. Ensure that
the five safety rules are complied with before working on the motor:
1. Isolate
2. Protect against reconnection
3. Make sure that the equipment is de-energized
4. Ground and short-circuit
5. Cover or enclose adjacent components which are still live
[ID 800.01]
4.3 Checking the insulation resistance
Instructions relevant to safety
WARNING
Dangerous, high voltages
During and immediately after measurement, dangerous voltages are sometimes present at
the terminals. Do not touch the terminals.
If the supply feeder cables are connected, you must ensure that the line voltage cannot be
connected. Once you have measured the insulation resistance, discharge the winding by
connecting the ground potential.
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