GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 118)

GEI-100332Ga
——— CONVERTER OPERATION ———
5
42
Measurement error messages
These messages may occour when extreme parameter values have to be identified. It can be useful to retry the
self tune command when any of the following messages occours. If messages persist, alternative manual tuning
procedures should be used.
Description Note
“Over speed”
“Drive stalled”:
Increase value of parameter Test T curr lim and repeat Self tuning
“Load applied”: Nominal zero load torque at standstill was detected. Self tuning is impossible for this
type of load.
“T curr too high”: Reduce value of Test T curr lim parameter for Self tuning
“Friction null”: Value of friction is zero or lower than the accuracy limit of the control system
5.3.5.3 Field converter
The default DV-300 converters are set to operate without Voltage control. The following settings must be taken
into consideration when a functioning in Voltage control is needed or when the field of the connected motor is
not power supplied via the converter.
All the settings described in this chapter must be carried out in disable condition (no voltage on terminal 12).
Selection of the functioning system
- With a constant field current: Flux reg mode = Constant current
Enable flux reg = Enabled
- With Voltage control: Flux reg mode = Voltage control.
In the CONFIGURATION menu set the max output
voltage via the Max out voltage parameter.
Enable flux reg = Enabled
- Field circuit not supplied by DV-300 Flux reg mode = OFF
Enable flux reg = Disabled
Setting the rated field current
- Set the rated field current of the motor via the Motor nom flux parameter.
- When the field motor current is substantially lower than the rated current of the field converter, adapt trough
the S14 dip switches the field converter. It must be configured according to the table 5.3.5.3.1 Via the Nom
flux curr parameter it is possible to select the new field rated current.
- For fixed field current operation, if the actual motor (base) field current ≤ 10% of the maximum rating of
the field package it is required to calibrate the field current feedback scaling using dipswitch S14.
- For weak field operation, also referred as “CEMF field control” or “crossover field control”, if the top base
speed Motor nom flux ≤ 10% of the maximum rating of the field package it is required to calibrate the
field current feedback scaling using dipswitch S14.
Calibration to the exact field current setting is not required, as long as the above conditions are met.
Calibration is not required if the field control is provided by a separate field converter.