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Programming Your Application
6-19
590+ Series DC Digital Converter
CURRENT LOOP
Use this to setup the drive's conventional
current/torque loop.
It takes the current demand, imposes limits
through four clamps, and then uses a PI loop
to control the output.
The four separate clamps - current profile,
inverse time overload, bipolar clamps and
main current clamp - the clamps are in
series and lowest clamp takes effect. The
resultant clamp value can be seen in the
diagnostics ACTUAL POS I LIM and
ACTUAL NEG I LIM.
The inputs to this block are: the current
demand from the speed loop or terminal A3
(selected via I DMD. ISOLATE); the
current limit clamps from CURRENT
PROFILE and INVERSE TIME (note that
the bipolar clamps and main current clamp
are resident in the CURRENT LOOP block); current feedback from CALIBRATION.
The default configuration uses DIGIN 1 and DIGIN 3 for switching modes (BIPOLAR
CLAMPS and I DMD. ISOLATE respectively), ANIN 4 and ANIN 5 for setting current
clamps (NEG. I CLAMPS and POS. I CLAMPS respectively).
A non-regenerative controller should have REGEN MODE set to DISABLED for proper
motor control.
MMI Menu Map
1
SETUP PARAMETERS
2
CURRENT LOOP
MAIN CURR. LIMIT
PROP. GAIN
INT. GAIN
AUTOTUNE
FEED FORWARD
DISCONTINUOUS
ADDITIONAL DEM
BIPOLAR CLAMPS
REGEN MODE
MASTER BRIDGE
POS. I CLAMP
NEG. I CLAMP
I DMD. ISOLATE
CUR. LIMIT/SCALER
MMI Menu Map
1
CONFIGURE DRIVE
MAIN CURR. LIMIT
AUTOTUNE
Current Loop
AT CURRENT LIMIT
[ 42]
–
FALSE
IA DEMAND
[ 66]
–
0.00 %
IA FEEDBACK
[ 65]
–
0.00 %
IA FEEDBACK
[538]
–
0.0 AMPS
IF FEEDBACK
[539]
–
0.0 AMPS
AUTOTUNE
[ 18]
–
OFF
ILOOP SUSPEND
[ 46]
–
FALSE
MASTER BRIDGE
[527]
–
OFF
100.00 %
–
[ 15] CUR. LIMIT/SCALER
110.00 %
–
[421] MAIN CURR. LIMIT
45.00
–
[ 16] PROP GAIN
3.50
–
[ 17] INT. GAIN
2.00
–
[136] FEED FORWARD
12.00 %
–
[137] DISCONTINUOUS
0.00 %
–
[ 30] ADDITIONAL DEM
DISABLED
–
[ 90] BIPOLAR CLAMPS
ENABLED
–
[201] REGEN MODE
100.00 %
–
[301] POS. I CLAMP
-100.00 %
–
[ 48] NEG. I CLAMP
DISABLED
–
[119] I DMD. ISOLATE
Parameter
Tag
Range
AT CURRENT LIMIT
42
FALSE / TRUE
Refer to the DIAGNOSTICS function block description, page 6-23.
IA DEMAND
66
xxx.xx % (h)
(IaDmd UNFILTERED)
Refer to the DIAGNOSTICS function block description, page 6-23.
IA FEEDBACK
65
xxx.xx % (h)
(IaFbk UNFILTERED)
Refer to the DIAGNOSTICS function block description, page 6-23.
IA FEEDBACK
538
xxxx.x AMPS
(CURRENT FBK.AMPS)
Refer to the DIAGNOSTICS function block description, page 6-23.
IF FEEDBACK
539
xxxx.x AMPS
(FIELD I FBK.AMPS)
Refer to the DIAGNOSTICS function block description, page 6-23.
AUTOTUNE
18
OFF / ON
Turns the AUTOTUNE procedure on. Refer to Chapter 4: "Operating the Converter" -
Performance Adjustment.
ILOOP SUSPEND
46
FALSE / TRUE
Reserved parameter for use by SSD Drives.
MASTER BRIDGE
527
OFF / ON
A diagnostic indicating currently active bridge; master = ON, slave = OFF.
MAIN CURR. LIMIT
421
0.00 to 200.00 %
Independent symmetric current clamp. Sets symmetric clamps outside scaling from the
CUR. LIMIT/SCALER parameter.
PROP GAIN
16
0.00 to 200.00
(PROP. GAIN)
Proportional gain control for armature current PI loop. This parameter is set during the
autotune function.