172 P9 ASD Installation and Operation Manual
(Virtual Linear Pump) External Device Delay Timer
Virtual Linear Pump External Device Delay Timer
During a properly configured Virtual Linear Pump operation, this parameter
establishes the time that the Virtual Linear Pump operating level must remain
within the (Virtual Linear Pump) Maximum threshold or the (Virtual Linear
Pump) Minimum threshold to activate/deactivate the Sleep Timer (F382) or an
auxiliary pump.
See Figures 31 and 32 for additional information on the (Virtual Linear Pump)
Maximum threshold and the (Virtual Linear Pump) Minimum threshold.
Increasing Load
If the Virtual Linear Pump operating level of the Lead Pump is within the
(Virtual Linear Pump) Maximum threshold, and the External Device Delay
Timer times out, OUT1 will change states and activate an auxiliary pump
(Lag1).
Should the Virtual Linear Pump operating level return to the (Virtual Linear
Pump) Maximum threshold for a duration in excess of the External Device
Delay Timer, OUT2 will change states and activate the second auxiliary pump
(Lag2).
Decreasing Load
If operating in the (Virtual Linear Pump) Minimum threshold, and the External
Device Delay Timer times out while OUT2 is activated, OUT2 will change
states and deactivate the second auxiliary pump (Lag2).
Should the system return to the (Virtual Linear Pump) Minimum threshold for a
duration in excess of the External Device Delay Timer, OUT1 will change
states and deactivate the auxiliary pump (Lag1).
Note: Set the Sleep Timer Delay (F383) to two (2) times the Virtual
Linear Pump External Device Delay Timer (if using the Sleep
Timer function) as not to place the primary ASD in the sleep
mode with Lag1 and/or Lag2 running.
Note: Set OUT1 and OUT2 to External Device 1 and 2, respectively,
as required.
Direct Access Number — F480
Parameter Type — Numerical
Factory Default — 5
Changeable During Run — Yes
Minimum — 0.1
Maximum — 6553.5
Units — Seconds
ternal Device
ternal
vice 2
Auxiliary Pump Activation Sequence
PUMP ID IF @ AND THEN OR
Lead Pump Max Zone Counter Time = 0
Activate
OUT1
Lag1 Pump Max Zone Counter Time = 0
Activate
OUT2
Lag2 Pump Max Zone Counter Time = 0
Run
Continuous
Lag2 Pump Min Zone Counter Time = 0
Deactivate
OUT2
Lag1 Pump Min Zone Counter Time = 0
Deactivate
OUT1
Lead Pump Min Zone Counter Time = 0 —
Sleep if
enabled
Note: The number of pumps used
may be increased by using
the optional expansion
board (Primary pump plus
auxiliary pumps).
F480 F480
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