Actual signals and parameters 281
8123 PFC ENABLE Selects PFC control or SPFC control. When enabled, PFC
control or SPFC control does the following:
• 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.
NOT SEL
NOT SEL Disabled 0
ACTIVE PFC control enabled 1
SPFC ACTIVE SPFC control enabled. Soft pump and fan control is used for
alternation applications where lower pressure peaks are
desirable when a new auxiliary motor is started.
2
SPFC +
AUTOCHANG
E
SPFC control with autochange enabled. Autochange with
soft pump and fan control (SPFC) is active only when
auxiliary motors are not running. The speed regulated motor
alternates according to the autochange logic.
3
8124 ACC IN AUX
STOP
Sets the PFC acceleration time for a zero-to-maximum
frequency ramp. This PFC 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.
0.0 = NO
T SEL
All parameters
No. Name/Value Description Def/FbEq
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