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Programming Your Application
1-121
690+ Series Frequency Inverter
TORQUE CALC
This function block interfaces the calculated
winder tension demand to the torque loop,
for open-loop centre wind applications.
Refer to Macro 4.
Functional Description
Over wind
Torque Demand
Positive Torque Limit
Negative Torque Limit
Tension Enable
-1
Torque Limit
Rewind
xor
The torque calculator controls web tension by limiting the torque that the controller can
produce, this must be used in conjunction with the SPEED CALC function block, which ensures
that the speed loop is saturated.
This combination of saturated speed loop and torque limits ensures that, in the event of a web
break, the reel will remain under speed control and be limited in speed to:
calculated winder speed + over speed.
Torque Calc
–
POS TORQUE LIMIT [790]
–
150.00 %
–
NEG TORQUE LIMIT [791]
–
-150.00 %
TRUE
–
[786] OVER-WIND
–
TRUE
–
[1550] REWIND
–
FALSE
–
[787] TENSION ENABLE
–
0.00 %
–
[788] TORQUE DEMAND
–
150.00 %
–
[789] TORQUE LIMIT
–
MMI Menu Map
1
SETUP
2
WINDER
3
TORQUE CALC
OVER-WIND
REWIND
TENSION
ENABLE
TORQUE
DEMAND
TORQUE
LIMIT
POS TORQUE LIMIT
NEG TORQUE LIMIT
Parameter Descriptions
OVER-WIND
Range: FALSE / TRUE
Overwind mode selected when TRUE.
REWIND
Range: FALSE / TRUE
The Rewind mode is selected when TRUE.
TENSION ENABLE
Range: FALSE / TRUE
Set FALSE, the drive is speed controlled with the speed compensated by the roll diameter to
provide the roll surface speed matched to line speed. This also provides jog with constant
surface speed. In this mode the diameter can be preset. This mode is used when the web is not
connected to the winder.
Set TRUE, the closed loop trim PID trim is enabled to maintain tension or dancer position.
The diameter is calculated as the roll builds up (or builds down for an unwind).
TORQUE DEMAND
Range: -200.00 to 200.00 %
The tension demand input (usually calculated by the TAPER CALC function block).
TORQUE LIMIT
Range: 0.00 to 200.00 %
The torque limit applied when TENSION ENABLE is set FALSE.
POS TORQUE LIMIT
Range: —.00 %
The positive torque limit when TENSION ENABLE is FALSE.
NEG TORQUE LIMIT
Range: —.00 %
The negative torque limit when TENSION ENABLE is FALSE.