Torque Demand; Current Demand; Motoring Current Limit; Regen Current Limit - Control Techniques unidrive sp Advanced User's Manual

Parameter Keypad and
Menu 4
structure display
4.03

Torque demand

Drive modes Open-loop, Closed-loop vector, Servo
Bit SP FI
Coding
1
Range Open-loop, Closed-loop vector, Servo
Update rate 4ms write
Open-loop
The torque demand is the sum of the torque reference (Pr 4.08) and the torque offset (Pr 4.09), if enabled. The units of the torque demand are % of
rated torque. 100% rated torque is defined as the torque produced by 100% rated active current.
Closed-loop vector
The torque demand can be derived from the speed controller and/or the torque reference and offset. The units of the torque demand are % of rated
torque. 100% rated torque is defined as the torque produced by 100% rated active current.
4.04

Current demand

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP FI
Coding
1
Open-loop, Closed-loop vector, Servo,
Range
Regen
Update rate 4ms write
Open-loop
The current demand is derived from the torque demand. Provided the motor is not field weakened the torque and current demands are the same. In
field weakening the current demand is increased with reduced flux:
Pr 4.04 = Pr 4.03 x frequency / rated frequency
The current demand is subject to the current limits.
Closed-loop vector and Servo
The current demand is derived from the torque demand. Provided the motor is not field weakened the torque and current demands are the same. In
the field weakening range the current demand is increased with reduced flux unless Pr 5.28 = 1. The level of flux is derived from the motor model
within the drive controllers.
Pr 4.04 = Pr 4.03 x flux / rated flux
Regen
The current demand is the output of the voltage controller in Menu 3 subject to the current limits.
4.05

Motoring current limit

Drive modes Open-loop, Closed-loop vector, Servo
Bit SP
Coding
Range Open-loop, Closed-loop vector, Servo
Open-loop
Default
Closed-loop vector, Servo
Second motor
Open-loop, Closed-loop vector, Servo
parameter
Update rate Background read
4.06

Regen current limit

Drive modes Open-loop, Closed-loop vector, Servo
Bit SP
Coding
Range Open-loop, Closed-loop vector, Servo
Open-loop
Default
Closed-loop vector, Servo
Second motor
Open-loop, Closed-loop vector, Servo
parameter
Update rate Background read
90
Parameter Parameter
x.00 description format
DE Txt VM DP ND
1 1 1
±TORQUE_PROD_CURRENT_MAX %
DE Txt VM DP ND
1 1 1
±TORQUE_PROD_CURRENT_MAX %
FI DE Txt VM DP ND
1 1
0 to MOTOR1_CURRENT_LIMIT_MAX %
165.0
175.0
Pr 21.27
FI DE Txt VM DP ND
1 1
0 to MOTOR1_CURRENT_LIMIT_MAX %
165.0
175.0
Pr 21.28
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Advanced parameter
Macros
descriptions
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1 1
RA NC NV PT US RW BU
1 1 1
Serial comms Electronic
Performance
protocol nameplate
PS
PS
PS
1
PS
1
Unidrive SP Advanced User Guide
Issue Number: 7
Feature look-
up table