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100 Unidrive SP Advanced User Guide
www.controltechniques.com Issue Number: 7
applications to produce the torque required to accelerate or decelerate the load inertia.
The current demand filter time constant is defined by this parameter if the speed gain select (Pr 3.16) is one.
The maximum for Pr 4.08 and Pr 4.20 is defined by this parameter
See Pr 4.16 on page 97.
Pr 4.26 shows the torque producing current (Pr 4.02) as a percentage of the active torque producing current, but with an additional adjustment above
base speed so that this parameter shows percentage torque. Below base speed Pr 4.26 is equal to Pr 4.20. Above base speed the percentage torque
producing current (shown in Pr 4.20) is adjusted as follows:
Pr 4.26 = Pr 4.20 x rated frequency / frequency
4.23 Current demand filter 2
Drive modes Closed-loop vector, Servo
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
1111
Range Closed-loop vector, Servo 0.0 to 25.0 ms
Default Closed-loop vector, Servo 0.0
Update rate Background read
4.24 User current maximum scaling
Drive modes Open-loop, Closed-loop vector, Servo, Regen
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
11 111
Range
Open-loop, Closed-loop vector, Servo,
Regen
0.0 to TORQUE_PROD_CURRENT_MAX %
Default
Open-loop,
Closed-loop vector, Servo, Regen
165.0
175.0
Update rate Background read
4.25 Low speed thermal protection mode
Drive modes Open-loop, Closed-loop, Servo
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111
Default Open-loop, Closed-loop, Servo 0
Update rate Background read
4.26 Percentage torque
Drive modes Open-loop
Coding
Bit SP FI DE Txt VM DP ND RA NC NV PT US RW BU PS
111111
Default Open-loop ±USER_CURRENT_MAX %
Update rate Background read
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