276 Actual signals and parameters
8123
PFA ENABLE
0…3 - 0
Sets the start delay for speed regulated motors in the system. Using the delay, the
drive works as follows:
• Switches on the contactor of the speed regulated motor – connecting the motor to
the drive power output.
• Delays motor start for the time 8122 PFA START DELAY.
• Starts the speed regulated motor.
• Starts auxiliary motors. See parameter 8115 AUX MOT START D for delay.
WARNING! Motors equipped with star-delta starters require a PFA start delay.
•After the drive relay output switches a motor On, the star-delta starter must
switch to the star-connection and then back to the delta-connection before the drive
applies power.
• So, the PFA start delay must be longer than the time setting of the star-delta starter.
1 = ACTIVE – PFA control enabled.
2 = SPFC ACTIVE – SPFC control enabled. The soft pump and fan control is used for
alternation applications where lower pressure peaks are desirable when a new
auxiliary motor is started.
3 = SPFC+AUTOCHG – SPFC control with autochange is enabled. Autochange with
soft pump and fan control (SPFC) is active only when auxiliary motors are not
running. The speed regulated motor is alternated according to the autochange
logic.
Group 81: PFA control
Code Description Range Resolution Default S
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