Programming D-35
DC590+ Series DC Digital Drive
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 internal 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 5 for setting the symmetrical
positive and negative current clamps.
CURRENT LOOP
Current limit scaler. It scales bipolar/unipolar clamps. To achieve 200% current limit, the current limit scaler should be set to 200%.
MAIN CURR. LIMIT 421 0.00 to 200.00 %
Independent symmetric current clamp. Sets symmetric clamps outside scaling from the CUR. LIMIT/SCALER parameter.
Proportional gain control for armature current PI loop. This parameter is set during the autotune function.
INT. GAIN 17 0.00 to 200.00
Integral gain control for armature current PI loop, set during the autotune function.
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