ABB ACS880+N5350 User Manual page 143

Parameter (Number)
Block Title
SPEED ACCELERATION TIME 2
REFERENCE (23.14)
RAMP
(Continued)
DECELERATION TIME 2
(23.15)
Speed error calculation; speed error window control configuration; speed error step.
See the control chain diagrams.
USED SPEED REFERENCE
(24.01)
USED SPEED FEEDBACK
(24.02)
SPEED CONTROL Speed controller settings. See the control chain diagrams.
USED SPEED FEEDBACK
(25.01)
SPEED PROPORTIONAL
GAIN (25.02)
12-64 Startup Assistant & Parameters
Table 12-4 Level 1 Parameter Block Definitions
Selection (Value)
Default: s = Motor Nom Spd/10
Range: 0.000 - 1800.000s
Defines acceleration time 2. See parameter 23.12 Acceleration time 1.
Default: 60s
Range: 0.000 - 1800.000s
Defines deceleration time 2. See parameter 23.13 Deceleration time 1.
Default: Read Only
Range: -30000.00 to +30000.00 RPM
Displays the ramped and corrected speed reference (before speed
error calculation). See the control chain diagram.
This parameter is read-only.
Default: Read Only
Range: -30000.00 to +30000.00 RPM
Displays the speed feedback used for speed error calculation. See the
control chain diagram.
This parameter is read-only.
Default: Read Only
Range: -1600.0 to +1600.0%
Displays the speed controller output that is transferred to the torque
controller. See the control chain diagram.
This parameter is read-only.
Default: 0.50
Range: 0.00 - 250.00
Defines the proportional gain (Kp) of the speed controller. Too high a
gain may cause speed oscillation. The figure below shows the speed
controller output after anerror step when the error remains constant.
Controller
output = K
If gain is set to 1, a 10% change in error value (reference - actual value)
causes the speed controller output to change by 10%, ie. the output value
is input × gain.
Descriptions
%
Gain = K
T = Integration time = 0
I
T
D
Error value
Controller output
× e
p
= 1
p
= Derivation time = 0
e = Error value
Time
3AXD50000011888