70 Start-up with medium voltage stator
Start-up measurements
The start-up measurements described in this section give useful information if a problem is
detected during the start-up. These measurements are not normally required during the
start-up procedure.
WARNING! The safety instructions must be followed during start-up procedure.
See the converter hardware manual for safety instructions.
Stator current transformer polarity check
The converter firmware contains an automatic stator current transformer offset
compensation function. Automatic offset calibration can be disabled with parameter 21.07
BATTERY TEST when the stator current polarity is checked during start-up procedure. If
offset calibration is enabled (parameter 21.07 BATTERY TEST is set to NO) when the
external battery is connected in parallel with the stator current transformers, the measured
waveforms may be distorted. The offset calibration is disabled by setting the parameter
21.07 BATTERY TEST to CONNECT BATT.
Since the converter firmware transforms the measured currents from 3-phase coordinate
values into 2-phase coordinate values, measured signals are different compared to the
direct measurements.
Below is signal behavior presented when the battery test is executed.
Phase U test
,
,
,
,
, - ( , -
06/123457 06/128457
21.07 BATTERY TEST is set to NO
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