Rockwell Automation 1397 DC Drive Firmware 2.xx - Manual (Page 198)

5–88 Programming Parameters
Publication 1397-5.0 — June, 2001
Field
[Fld Auto Weak] — P.275
Only used 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 180
°. If
[Feedback Select] is set to [Armature Volt],
this is automatically set to [Disabled] and
cannot be changed.
Display/Drive Units: Numeric/Text
Parameter Range: 0 = Disabled
1 = Enabled
Parameter Type: Configurable
Group: Field
Minimum Value: 0
Factory Default: 0
Maximum Value 1
When [Armature Voltage] exceeds [Fld Weaken Level] and the field begins to weaken, the field control loop regulates armature voltage.
[Armature Voltage] and [Fld Weaken Level] 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
Weak] is set to [Enabled].
Fld Loop Kp Fld Lp Lead Freq
Fld Delta Hi Lim
Fld Auto Weak
Fld Weaken Kp Fld Weak Ld Freq
From Field Block Diagram
Field
Regulator
Supply
Field
Phase
Firing Logic
From Field Block Diagram
[Fld Delta Hi Lim] — P.276
High limit of the field current PI block. See
[Field Auto Weak] for block diagram. Display/Drive Units: Degrees
Parameter Type: Configurable
Group: Field
Minimum Value: 0
Factory Default: 130
Maximum Value 180