ABB ACS550 Series, User Manual

Page: 165 / 310

ACS550 User’s Manual 165
Parameters
4023 PID SLEEP LEVEL
Sets the motor speed / frequency that enables the PID sleep
function – a motor speed / frequency below this level, for at least
the time period 4024
PID SLEEP DELAY
enables the PID sleep
function (stopping the drive).
• Requires 4022 = 7 (
INTERNAL
).
• See the figure: A = PID output level; B = PID process feedback.
4024 PID SLEEP DELAY
Sets the time delay for the PID sleep function – a motor speed /
frequency below 4023
PID SLEEP LEVEL
for at least this time period
enables the PID sleep function (stopping the drive).
• See 4023
PID SLEEP LEVEL
above.
4025 WAKE-UP DEV
Defines the wake-up deviation – a deviation from the setpoint
greater than this value, for at least the time period 4026
WAKE
-
UP
DELAY
, re-starts the PID controller.
• Parameters 4006 and 4007 define the units and scale.
• Parameter 4005 = 0,
Wake-up level = Setpoint - Wake-up deviation.
• Parameter 4005 = 1,
Wake-up level = Se Wake-up deviation.
• Wake-up level can be above or below setpoint.
See the figures:
• C = Wake-up level when parameter 4005 = 1
• D = Wake-up level when parameter 4005 = 0
• E = Feedback is above wake-up level and lasts longer than 4026
WAKE
-
UP DELAY
– PID function wakes up.
• F = Feedback is below wake-up level and lasts longer than 4026
WAKE
-
UP DELAY
– PID function wakes up.
4026 WAKE-UP DELAY
Defines the wake-up delay – a deviation from the setpoint greater
than 4025
WAKE
-
UP DEV
, for at least this time period, re-starts the
PID controller.
Code Description
Start
t < P 4024
t > P 4024
Stop
P 4023
P 4025
P 4026
Setpoint
A
B
t
t
P 4025
Setpoint
P 4025
C
D
}
}
4005 = 1
4005 = 0
t
P 4025
Setpoint
P 4025
C
D
P 4026
E
F
P 4026
t