Rockwell Automation WebPak 3000 DC Drive Application Workbook Version 1.1 - Manual (Page 31)

Configuring the Current Minor Loop 4-3
▲
Set CML REF LIMIT SELECT (P.311) to select the source for the CML HI (positive)
and LO (negative) current limits. The choices are:
SPD LOOP PI LIMITS - The CML loop reference limits are the same as those used
by the speed loop PI block.
REGISTER - The CML loop limits are POSITIVE CURRENT LIM (P.005) and NEGATIVE
CURRENT LIM (P.006).
þ If CML REF LIMIT SELECT (P.311) = REGISTER and you want NEGATIVE
CURRENT LIMIT (P.006) and POSITIVE CURRENT LIMIT (P.005) to be restricted
to positive values:
▲ Set NEG CUR LIM INV EN (P.226) to ENABLE . (Note that if P.006 is a
negative value, set P.226 to DISABLE .)
▲
If necessary, adjust CML REF RATE LIMIT (P.303) to set the accel/decel time of
the RATELIM block. This sets the minimum time for CML REFERENCE (P.396) to
change from zero to MAXIMUM CURRENT (P.007).
This parameter is set by the CML self-tuning procedure. Self-tuning will
overwrite values entered manually.
4.1.1 Applications Requiring On-the-Fly Switching Between Current and
Speed Regulation
If an application requires that the drive dynamically switch between current and speed
regulation, the function must be implemented via a network logic sequence since the
drive uses the hardware jumper J15 to select the regulator function.
þ
To implement dynamic switching between current and speed regulation:
Install a network kit and connect the J15 jumper to current/torque. (Refer to the
WebPak 3000 hardware manual, D3-3443.)
▲
Set the control source to NETWORK (P.000 = NETWORK ).
▲
Set CURRENT / SPEED SWITCH (P.811) to ENABLE .
Range : SPD LOOP PI LIMITS , REGISTER P.311 =
Range: ENABLE , DISABLE P.226 =
Range: 1 to 1000 ms P.303 = ms
!
ATTENTION: When operating in a current/torque mode, there is no
regulation of motor speed in the drive. Motor speed is determined by
other equipment and/or operating conditions of the application and can
become uncontrolled under some circumstances such as a web break.
The user is responsible to assure that the system level design has
appropriate detection and interlock protection to prevent the motor from
reaching unsafe speeds under all operating conditions. Failure to
observe this precaution could result in severe bodily injury or loss of life.
Range: KEYPAD , SERIAL , TERMBLK , NETWORK P.000 =
1(7:25.
Range : ENABLE , DISABLE P.811 =
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