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ACH550-01 User's Manual
Code Description
8123 PFA ENABLE
Selects PFA control. When enabled, PFA control:
• Switches in, or out, auxiliary constant speed motors as output
demand increases or decreases. Parameters 8109
8114
LOW FREQ
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
0 =
– Disables PFA control.
NOT SEL
1 =
– Enables PFA control.
ACTIVE
8124 ACC IN AUX STOP
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
• 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
0 =
NOT SEL
0.1...1800 – Activates this function using the value entered as the
acceleration time.
f
OUT
Aux.
motor
• A = speed regulated motor accelerating using
DECEL
parameters (2202 or 2205).
• B = speed regulated motor decelerating using
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
Parameter listing and descriptions
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3 define the switch points in terms of the drive output
MOTOR CTRL MODE
A
P 8125
1
0
.
.
Range
0=NOT SEL, 1=ACTIVE
START FREQ
= 3 (
:
).
SCALAR
FREQ
0.0...1800 s
Group 22:
ACCEL/DECEL.
Group 22: ACCEL/DECEL
P 8124
Group 22: ACCEL/
Group 22: ACCEL/
1 to
applies.
B
t
t
325
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