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YORK, A Johnson Controls Company
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Example: In the diagram below, the pumping station’s outlet flow is controlled by the measured inlet flow (A).
8122
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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 AYK550 power output.
• Delays motor start for the time 8122 PFA
START DELAY
.
• Starts the speed regulated motor.
• Starts auxiliary motors. See parameter 8115 for delay.
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• After the AYK550 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.
8123
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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
.
0 =
NOT SEL
– Disables PFA control.
1 =
ACTIVE
– Enables PFA control.
8124
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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.
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23 =,2
! 7
!2,2
4,
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M
3~
M
3~
M
3~
Outlet
Outlet
Outlet
P1
P2
P3
Sewage
Tank
Contactors
P1
P2
P3
Mains 3~
3
3
3
3
AYK550
3
3
Inlet Pipe
A
Pipe1
Pipe2
Pipe3
Summary of Contents for York AYK550
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