108 CHA NGE PARA METERS
6.9.2 FIELD CONTROL / Field enable PIN 99
Note. The field fail alarm is automatically inhibited if the field control is disabled.
6.9.3 FIELD CONTROL / Voltage output % PIN 100
It may be necessary to set the field voltage instead of the field current. E. g. There may only be a volts rating
on the dataplate. See 7.3.4 FLD I LOOP MONIT OR / Field firing angle of advance monitor PIN 146.
NOTE. The value of this parameter is not restored to the default by a 4-KEY RESET. It remains as calibrated.
This parameter allows voltage mode to be achieved by setting an upper clamp level to the field current loop.
Note. The rated field amps current setting in the calibration menu will be a limiting value irrespective of this
clamp voltage setting. This is to provide protection to the drive and the motor.
Conversely this voltage clamp setting will be a limiting value irrespective of the rated field amps setting. This
means that in order to ensure that the field output voltage al ways remains at the clamp voltage it is
necessary to set the rated field amps to a level that is slightly in excess of the cold field current.
Then as the field w arms up, any voltage rise needed by the field current loop will be clamped to the level set.
The clamp will work with the rated field amps set to maximum, however this may not afford sufficiently safe
protection to the motor if a problem occurs in the field winding that results in overcurrent.
See also 14.9.1 Wiring diagram for A C supply to L1/2/3 different to EL1/2/3. (E.g. Low voltage field)
6.9.4 FIELD CONTROL / Field proportional gain PIN 101
Increase to improve response, too much may cause instability in the field current.
6.9.5 FIELD CONTROL / Field integral gain PIN 102
Increase to improve response, too much may cause overshoot.
FIELD C ONTROL 3
99)FIELD EN ABLE
99)FIELD EN ABLE
ENABLED
PARA METER RANGE DEF AULT PIN
FIELD ENABLE ENABLED OR DIS ABLED EN ABLED 99
This allows the field output to
be enabled or disabled.
R
R
FIELD C ONTROL 3
100)FIELD V OLTS OP %
100)FIELD V OLTS OP %
90.00%
PARA METER RANGE DEF AULT PIN
FIELD V OLTS OP % 0.00 to 100.00 % 90.00 % 100
Sets the DC field voltage clamp
as a % of the AC supply volts.
R
R
FIELD C ONTROL 3
101)FIELD PROP G AIN
101)FIELD PROP G AIN
10
PARA METER RANGE DEF AULT PIN
FIELD PROP GAIN 0 to 1000 10 101
Sets the proportional gain of
the field current control loop.
FIELD C ONTROL 3
102)FIELD INT G AIN
102)FIELD INT G AIN
100
PARA METER RANGE DEF AULT PIN
FIELD INTEGRAL 0 to 1000 100 102
Sets the integral gain of the
field current control loop.
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