Reactive Current Reference; Torque Offset; Torque Offset Select; Torque Mode Selector - Emerson unidrive sp User Manual
Universal variable speed ac drive for induction and servo motors
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Also See for unidrive sp:
- User manual (268 pages) ,
- User manual (310 pages) ,
- Technical note (6 pages)
Table of Contents
Parameter
Keypad and
Menu 4
structure
display
4.08
Reactive current reference
Drive modes
Regen
Coding
Bit
SP
Range
Regen
Default
Regen
Update rate
4ms read
In regen mode it is possible to produce some current in the x axis of the reference frame so that the regen unit can be made to produce or consume
reactive power. This parameter defines the level of reactive current as a percentage of the regen mode rated current (Pr 5.07). Positive reactive
current produces a component of current flowing from the supply to the drive at the regen unit terminals that lags the respective phase voltage, and
negative reactive current produces a component of current that leads the respective voltage. It should be noted that the maximum current in regen
mode is limited to DRIVE_CURRENT_MAX, and so the drive applies a limit to this parameter (REGEN_REACTIVE_MAX) to limit the current
magnitude. Therefore the symmetrical current limit (Pr 4.07) must be reduced below its maximum value before this parameter can be increased from
zero.
4.09
Torque offset
Drive modes
Open-loop, Closed-loop vector, Servo
Bit
SP
Coding
Range
Open-loop, Closed-loop vector, Servo
Default
Open-loop, Closed-loop vector, Servo
Update rate
4ms read
4.10
Torque offset select
Drive modes
Open-loop, Closed-loop vector, Servo
Bit
SP
Coding
1
Default
Open-loop, Closed-loop vector, Servo
Update rate
4ms read
The torque offset is added to the torque reference when Pr 4.10 is one. The torque offset is updated every 4ms when connected to an analog input,
and so Pr 4.08 should be used for fast updating if required.
4.11
Torque mode selector
Drive modes
Open-loop, Closed-loop vector, Servo
Bit
SP
Coding
Open-loop
Range
Closed-loop vector and Servo
Default
Open-loop, Closed-loop vector, Servo
Update rate
4ms read
Open loop
If this parameter is 0 normal frequency control is used. If this parameter is set to 1 the current demand is connected to the current PI controller giving
closed loop torque/current demand as shown below. The current error is passed through proportional and integral terms to give a frequency reference
which is limited to the range ±SPEED_FREQ_MAX .
Current
demand
+
P Pr 4.13
I Pr 4.14
-
Active
current
100
Parameter
Parameter
x.00
description format
FI
DE
Txt
VM
DP
ND
1
1
±REGEN_REACTIVE_MAX %
0.0
FI
DE
Txt VM
DP
ND
1
1
±USER_CURRENT_MAX %
0.0
FI
DE
Txt
VM
DP ND
0
FI
DE
Txt
VM DP
ND
0 to 1
0 to 4
0
Frequency
reference
www.controltechniques.com
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
RA
NC
NV
PT
US RW BU
1
1
Serial comms
Electronic
Performance RFC mode
protocol
nameplate
PS
PS
PS
PS
1
Unidrive SP Advanced User Guide
Issue Number: 10
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