1-182 ACH550-UH User’s Manual
Parameters
8123 PFA ENABLE 0, 1 1 0 (NOT SEL)
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…1800.0 s 0.1 s 0.0 s (
NOT SEL)
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.
8125 DEC IN AUX START 0.0…1800.0 s 0.1 s 0.0 s (NOT SEL)
Sets the PFA deceleration time for a maximum-to-zero frequency ramp. This PFA deceleration ramp:
• Applies to the speed regulated motor, when an auxiliary motor is switched on.
• Replaces the deceleration ramp defined in Group 22: ACCEL/DECEL.
• Applies only until the output of the regulated motor decreases by an amount equal to the output of the auxiliary
motor. Then the deceleration ramp defined in Group 22: ACCEL/DECEL applies.
0 = NOT SEL.
0.1…1800 – Activates this function using the value entered as the deceleration time.
• See parameter 8124.
8126 TIMED AUTOCHNG 0…4 1 0 (NOT SEL)
Sets the autochange using a Timed function. See parameter 8119
AUTOCHNG LEVEL.
0 =
NOT SEL.
1 =
TIMED FUNC 1 – Enables autochange when Timed function 1 is active.
2…4 =
TIMED FUNC 2…4 – Enables autochange when Timed function 2…4 is active.
8127 MOTORS 1…7 1 2
Sets the actual number of PFA controlled motors (maximum 7 motors, 1 speed regulated, 3 connected direct-on-line
and 3 spare motors).
• This value includes also the speed regulated motor.
• This value must be compatible with the number of relays allocated to PFA if the Autochange function is used.
• If Autochange function is not used, the speed regulated motor does not need to have a relay output allocated to
PFA but it needs to be included in this value.
Group 81: PFA Control
Code Description Range Resolution Default S
P 8125
P 8124
A
B
1
0
Aux.
motor
f
OUT
t
t
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