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The current minor loop regulator, 2 the current minor loop regulator – Rockwell Automation WebPak 3000  DC Drive Application Workbook Version 1.1 User Manual

Page 32

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4-4

WebPak 3000 DC Drive Application Workbook, Version 1.1

Note the following design features:

Network logic will switch between current and speed regulation by activating bit 11
of the network command word.

If a network kit is installed, the control source is

NETWORK

, and P.811 is set to

DISABLE

, the drive will operate according to the status of jumper J15.

If a network kit is not installed, drive operation will revert back to the status of jumper
J15, ignoring the status of P.811.

NETWORK

KIT

(P.796) indicates if a network kit is

INSTALLED

or

NOT

INSTALLED

.

Speed loop and current minor loop self-tuning can only be performed when the
control source is

TERMBLK

. Jumper J15 must be set to the speed/voltage position to

perform speed loop self-tuning.

Section jog cannot be used when current/torque is active. The current/speed
network bit must be set to speed to permit section jog. If a jog-to-run transition
occurs, the drive will run in the mode specified by the current/speed network bit.
This will permit switching “on the fly” from a speed-regulated jog mode to a
current/torque regulator.

The

S

-

CURVE

block and the speed loop

PI

block are conditioned to permit a smooth

transition from torque to speed by network bit switching.

In the current/torque mode, a stop command will initiate a coast/DB stop.

In the speed/voltage mode, a stop command will initiate a stop as defined by

STOP

MODE

SELECT

(P.114).

Important: The WebPak 3000 drive does not accommodate bumpless dynamic

switching of other types of outer control loop designs.

4.2

The Current Minor Loop Regulator

Refer to figure A.9 in Appendix A of the software manual (D2-3444) as you configure
the current minor loop (

CML

) regulator.

The proportional-integral (

PI

) controller adjusts the armature power bridge firing angle,

ARMATURE

DELTA

(P.399), to compensate for any difference between the reference

CML

REFERENCE

(P.396) and the feedback

CML

FEEDBACK

(P.397).

ARMATURE

BRIDGE

POL

(P.394) indicates which armature power bridge is active.

OFF

indicates the forward bridge.

ON

indicates the reverse bridge.

CML

FEEDBACK

(P.397) is scaled by

CML

FEEDBACK

GAIN

ADJ

(P.300), J18

ARM

I

FB

RESISTOR

(P.395),

MOTOR

RATED

ARM

AMPS

(P.008), and

CT

TURNS

RATIO

(P.010). These

parameters can be validated for the connected motor by using information found in the
WebPak 3000 software manual (D2-3444).

þ

To configure the current minor loop regulator:

Set or verify

CML

FEEDBACK

GAIN

ADJ

(P.300).

Range: 0.900 to 1.100

P.300 =