Current Magnitude; Active Current - Emerson unidrive sp User Manual

Parameter Keypad and Parameter
structure display x.00
4.01

Current magnitude

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Update rate 4ms write
This parameter is the r.m.s. current from each output phase of the drive. The phase currents consist of an active component and a reactive
component. The three phase currents can be combined to form a resultant current vector as shown below:
y
Resultant
output current
Pr 4.02
Pr 4.01
Pr 4.17
x
The resultant current magnitude is displayed by this parameter. The active current is the torque producing current for a motor drive and the real
current for a regen unit. The reactive current is the magnetizing or flux producing current for a motor drive.
4.02

Active current

Drive modes Open-loop, Closed-loop vector, Servo, Regen
Bit SP
Coding
Open-loop, Closed-loop vector, Servo,
Range
Regen
Update rate 4ms write
Open-loop, Closed-loop vector and Servo
The active current is the torque producing current in a motor drive.
Direction of active current
+
-
+
-
The active current is aligned with the y axis of the reference frame. In open-loop mode the x axis of the reference frame is aligned with the stator flux
vector. In Closed-loop vector and Servo modes the x axis of the reference frame is aligned with the rotor flux vector. The motor torque is proportional
to the torque producing current when field weakening is not active. Once field weakening is active the torque producing current is boosted to
compensate for the reduction in motor flux.
Regen
The active current is the real current in a regen unit.
Direction of active current
+
-
The active current is aligned with the y axis of the reference frame. The y axis of the reference frame is aligned with the regen unit terminal voltage
vector.
Unidrive SP Advanced User Guide
Issue Number: 10
Parameter Advanced parameter
description format descriptions
FI DE Txt VM DP ND
1 1 2 1
0 to DRIVE_CURRENT_MAX A
FI DE Txt VM DP ND
1 1 2 1
±DRIVE_CURRENT_MAX A
Direction of rotation Torque direction
+ Forward (accelerating)
+ Reverse (decelerating)
- Forward (decelerating)
- Reverse (accelerating)
Power flow
From supply
Into supply
www.controltechniques.com
Serial comms
Macros
protocol
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
Electronic
Performance RFC mode
nameplate
PS
1
PS
Menu 4
97