Overvoltages When Switching High-Voltage Motors - Siemens SIMOTICS HV M Operating Instructions Manual

Commissioning

7.4 Overvoltages when switching high-voltage motors

General specifications
● Pay attention to the instructions on the lubricant plate.
● Regrease in portions. The shaft must rotate so that the new grease can be distributed in
Regreasing the roller bearings prior to commissioning
● If the period between delivery and commissioning is more than a year and less than four
Regreasing roller bearings before commissioning
You must regrease the roller bearings under the following conditions:
● If the machine has been in storage for more than four years.
● If the machine has not been stored in accordance with the specifications in the "Storage"
Procedure
1. Remove the bearing, regreasing pipes, grease nipples and the bearing cap.
2. Flush out the old grease.
3. Check the bearings before regreasing. If necessary, install new bearings.
4. Lubricate the bearings and reinstall the bearing components.
See also
Regreasing intervals and types of grease for operating roller bearings (Page 91)
Transport and storage (Page 27)
Stoppages (Page 80)
7.4 Overvoltages when switching high-voltage motors
When commissioning high-voltage motors or switchgear for high voltage motors from 3 kV and
above, surge voltages can occur while starting. This can damage the machine.
These consequences are independent of the motor size and quenching principle of the switch
used, i.e. they can also occur when using minimum oil,SF6- or air-blast switches.
● Avoid shutting down the machine during startup by, for instance, checking for errors in the
● Keep shutdowns during startup for checking the direction of rotation or other tests to an
74
the bearings.
years:
– Re-grease the roller bearings with twice the amount of grease specified on the lubricant
plate.
– Check the bearing temperature, as far as possible.
section.
starting control or for excessively sensitive protection settings.
absolute minimum.
SIMOTICS HV M 1RN76308PR900CG0-Z
Operating Instructions 07/2018