Reference Trimming; Settings - ABB ACS355 User Manual

Reference trimming

In reference trimming, the external reference is corrected depending on the
measured value of a secondary application variable. The block diagram below
illustrates the function.
1105 REF1 MAX /
2)
1108 REF2 MAX
Switch
max.
freq
max.
speed
Switch
9904
MOTOR CTRL
MODE
max.
torque
4233
TRIM
SELECTION
PID2 ref
PID2
PID2 act
REF1 (Hz/rpm) / REF2 (%) = Drive reference before trimming
REF' = Drive reference after trimming
max. speed = par. 2002
max. freq = par. 2008
max. torque = par. 2014
PID2 ref = par. 4210
PID2 act = par. 4214...4221
1)
Note: Torque reference trimming is only for external reference REF2 (%)
2)
REF1 or REF2 depending on which is active. See parameter
3)
When par. 4232 = PID2REF, the maximum trimming reference is defined by parameter
1105 when REF1 is active and by parameter
When par. 4232 = PID2OUTPUT, the maximum trimming reference is defined by parameter
2002 if parameter 9904
2008 value if parameter

Settings

Parameter
1102
4230 ...4232
4201 ...4229
Group 20 LIMITS
3)
Switch
REF1
(Hz/rpm) /
REF2 (%)
1)
Switch
PID2
output
4232 CORRECTION SRC
(or 2001 if the absolute value is greater)
(or 2007 if the absolute value is greater)
(or 2013 if the absolute value is greater)
value is VECTOR: SPEED
9904 value is SCALAR:
Additional information
REF1/2 selection
Trimming function settings
PID control settings
Drive operation limits
Select
2 (DIRECT)
1
(PROPORTION
1) )
AL
)
0 (NOT SEL
0
4230
4231 TRIM SCALE
1102.
1108 when REF2 is active.
or VECTOR: TORQ
FREQ.
Program features 129
REF1 (Hz/rpm) /
Add
1
)
REF2 (%)
Mul.
Mul.
and by parameter
REF'