Parker 591C - Page 284

590 Series DC Digital Drive Programming
D-35
CURRENT LOOP
Parameter Tag Range
I DMD. ISOLATE 119 DISABLED / ENABLED
Speed loop bypass; the current demand is taken from ANIN 2 (A3).
With I DMD. ISOLATE disabled, the current loop uses the current demand from the speed loop. With I DMD. ISOLATE enabled, ANALOG I/P 2,
terminal A3, supplies the current demand. With default scaling, 10V dc on terminal A3 is 100% current demand. An additional current input,
ADDITIONAL DEM, can be added to the current demand. The simplified diagram below, with reference to the default Block Diagram, shows how
the I DMD ISOLATE parameter selects the controlling loop.
SPEED LOOP PI
CURRENT LOOP PI
Speed Demand
Speed Feedback
Analog I/P2 (A3)
Digital I/P3 (C8)
I DMD ISOLATE
Current
Current Feedback
Motor
shown ENABLED
+
-
+
-
ADDITIONAL DEM
4 clamps
+
+
Demand
AT CURRENT LIMIT 42 FALSE / TRUE
Refer to Chapter 6: "The MMI - Man Machine Interface" - The MMI Menus (DIAGNOSTICS).
IaDmd UNFILTERED 66
⎯.x % (h)
Refer to Chapter 6: "The MMI - Man Machine Interface" - The MMI Menus (DIAGNOSTICS).
CURRENT DEMAND 299
⎯.xx %
Refer to Chapter 6: "The MMI - Man Machine Interface" - The MMI Menus (DIAGNOSTICS).
IaFbk UNFILTERED 65
⎯.x % (h)
Refer to Chapter 6: "The MMI - Man Machine Interface" - The MMI Menus (DIAGNOSTICS).
MASTER BRIDGE 527 FALSE/TRUE
A diagnostic indicating currently active bridge; master = TRUE, slave = FALSE.
PHASE ANGLE @ E 1174
⎯.x DEG
The motor back EMF, presented as the angle at which the supply volts matches it. This is the instantaneous angle above which firing the thyristor
would just start to make armature current.