Parameter listing and descriptions
325
ACH550-01 User's Manual
8123
PFA ENABLE
0=NOT SEL, 1=ACTIVE
Selects PFA control. When enabled, PFA control:
• Switches in, or out, auxiliary constant speed motors as output
demand increases or decreases. Parameters 8109
START
FREQ
1 to
8114
LOW
FREQ
3 define the switch points in terms of the drive output
frequency.
• Adjusts the speed regulated motor output down, as auxiliary motors
are added, and adjusts the speed regulated motor output up, as
auxiliary motors are taken off line.
• Provides Interlock functions, if enabled.
• Requires 9904
MOTOR
CTRL
MODE
= 3 (
SCALAR
:
FREQ
).
0 =
NOT
SEL
– Disables PFA control.
1 =
ACTIVE
– Enables PFA control.
8124
ACC IN AUX STOP
0.0…1800 s
Sets the PFA acceleration time for a zero-to-maximum frequency ramp.
This PFA acceleration ramp:
• applies to the speed regulated motor, when an auxiliary motor is
switched off.
• replaces the acceleration ramp defined in
Group 22: ACCEL/DECEL
.
• applies only until the output of the regulated motor increases by an
amount equal to the output of the switched off auxiliary motor. Then
the acceleration ramp defined in
Group 22: ACCEL/DECEL
applies.
0 =
NOT
SEL
0.1…1800 – Activates this function using the value entered as the
acceleration time.
• A = speed regulated motor accelerating using
Group 22: ACCEL/
DECEL
parameters (2202 or 2205).
• B = speed regulated motor decelerating using
Group 22: ACCEL/
DECEL
parameters (2203 or 2206).
• At aux. motor start, speed regulated motor decelerates using 8125
DEC
IN
AUX
START
.
• At aux. motor stop, speed regulated motor accelerates using 8124
ACC
IN
AUX
STOP
.
Code Description
Range
P 8125
P 8124
A
B
1
0
Aux.
motor
t
t
f
OUT
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