Bell & Gossett 176R0649C Technologic 502 Series Pump Controller - Manual (Page 40)

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39-12 Stage Stab. Proof Timer
(Old Par. 752)
0s 999s 60s After a new pump is staged on or off,
the system will wait at least this long
before allowing a pump to be staged on
or off. After a pump has been staged
on, the speed that the system reaches
after this timer expires is used to
calculate the de-stage speed.
39-13 De-Stage Percentage (Old
Par. 753)
0% 100% 80%
After a pump is staged on, the
controller waits until the stage
stabilization proof timer expires. It
then calculates the de-stage speed
by multiplying the pump speed by the
value in this parameter. The controller
will de-stage a pump when the system
speed reaches this value.
39-14 De-Stage Proof Timer (Old
Par. 754)
0s 999s 30s After a pump has been de-staged, the
controller will wait for the time set in
this parameter before allowing another
pump to be staged ON or OFF.
39-15 Min. De-Stage Speed (Old
Par. 755)
0% 100% 50%
The staging set in parameter P39-13
depends on the system speed after
the time delay of parameter P39-14.
If demand drops after the staging, the
de-stage speed could be too low. This
parameter sets an absolute minimum
de-stage speed. If the system runs
below this speed for the time in P39-16,
a pump will de-stage.
39-16 Min. De-stage Proof Timer
(NEW)
0s 999s 30s After the speed set in P39-15 is
reached, the controller will wait for
the time set in this parameter before
destaging.
39-2* EOC
Staging
39-20 Max Pump Flow (Old Par.
763)
0.0 999999.000GPM
227124.500 M3/h
0.000 This is used to initiate end-of-curve
staging on of an additional pump. This
represents the maximum flow per pump
at the end of the pump curve. When
the flow per pump is greater than his
value times the pump speed in percent,
the controller will begin to stage on an
additional pump .
39-21 EOC Staging Proof Timer
(Old Par. 764)
0s 999s 30s
After the feedback signal from the
flow meter indicates that the flow per
pump is greater than the expected
flow, this timer starts. The expected
flow is calculated by the product of the
maximum flow from the pump times the
percent of output speed If the condition
continues until the timer expires, an
additional pump will be staged on.
Table 6-2. Parameter 39-** Group, Detailed Description (continued)