Rockwell Automation FlexPak 3000 Power Module Version 4.2 User Manual

Page 119

APPENDIX B

49’1340 e

FlexPak 3000

B-15

FIELD AUTO WEAKEN (P.517)

Only available if the Field Current Regulator Kit is installed.
Enables or disables field weakening by the field control loop. When it is disabled, the field current PI
block high limit is fixed at 1805. If FEEDBACK SELECT is set to ARMATURE VOLT, this is
automatically set to DISABLED and cannot be changed.

Parameter Range:

DISABLED,
ENABLED

Default Setting:

DISABLED

Parameter Type:

Configurable

OIM Menu Path(s):

Field - Field Current Regulator - Field Loop Configure

Refer also to Parameters:

ARMATURE VOLTAGE (P.289)
FEEDBACK SELECT (P.200)
FLD WEAKEN THRESHOLD (P.518)
FLD WEAKEN PROP GAIN (P.519)
FLD WEAKEN LEAD FREQ (P.520)

When ARMATURE VOLTAGE exceeds FLD WEAKEN THRESHOLD and the field begins to weaken,
the field control loop regulates armature voltage. ARMATURE VOLTAGE and FLD WEAKEN
THRESHOLD try to maintain a zero input to the first PI block.
If armature voltage increases, a negative value is input to the PI block. This results in a lower current
input into the next PI block. This in turn lowers the armature voltage, lowering the input to the first PI
block so that it is closer to zero. The field control loop only affects armature voltage control if a
tachometer is used and if FIELD AUTO WEAKEN is set to ENABLED.

FLD WEAKEN PROP GAIN

FIELD AUTO WEAKEN

FLD WEAKEN LEAD FREQ

WLD

DISABLED

ENABLED

FIELD DELTA HI LIM

P.587

P.519

P.520

P.517

0°

FIELD PI LEAD FREQ

FIELD PI PROP GAIN

WLD

PHASE
FIRING
LOGIC

FIELD

(FIELD DELTA)

FIELD
REGULATOR
SUPPLY

P.588

P.515

P.514

FROM FIELD BLOCK DIAGRAM