Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020
241
Commissioning
Chapter 4
10.
Stop the drive. Set parameters
Operating Mode
to
Normal
and
Idc
Command Test
to zero.
T DC Link (P#115) Manual Tuning
An appropriate value for the
T DC Link
parameter can be determined from the
current regulator step response while operating in
DC Current
test mode. The
following procedure should be followed:
1.
Be sure that all the parameters in the
Drive Hardware
and
Motor Ratings
groups have been set to the correct values. Otherwise, the calculated value
of parameter
T DC Link
in
Current Control
will not be correct.
2.
Set parameter
Operating Mode
in the
Feature Select
to
DC Current
to enter
dc current test mode.
Figure 208 - Current Control Parameter Screen
3.
Set parameter
Idc Test Command
in
Current Control
to 0.225 pu for AFE
rectifier drives and 0.400 pu for SCR drives.
4.
Set parameter
CurReg Bandwidth
in
Current Control
to 100 rad/sec. A
lower than the normal bandwidth makes the step response easier to
measure.
5.
Set parameter
T DC Link
in
Current Control
to 0.020 sec, which is at the
low end of the normal range of values and should produce an under-
damped response.
6.
Assign parameters
Idc Reference
and
Idc Feedback
in the
Current Control
group to 2 DPM test points e.g. RTP1 and RTP2. This can be done
similarly to the way that the meter assignments were described earlier in
the chapter. Then they can be displayed on the oscilloscope.
7.
Start the drive. Set parameter
Idc Ref Step
in
Current Control
to 0.075pu
for AFE rectifier drive and 0.200 pu for SCR drives. The dc link current
will step up and down by this amount at regular intervals.
L
in
3
V
in
0
V
in
1
–
(
)
I
dc
----------------------------------
=
for SCR drives
