Bell & Gossett 176R0649C Technologic 502 Series Pump Controller - Manual (Page 41)

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39-22 EOC De-Stage Percentage
(Old Par. 765)
0% 100% 45%
This parameter works with the flow
feedback sensor to determine if a pump
needs to be staged off. If the flow per
pump is less than this parameter times
the expected pump flow, the controller
will begin to stage off a pump. For
this to de-stage a pump, the pressure
feedback signal must also indicate a
need to de-stage.
39-23 EOC De-Stage Proof Timer
(Old Par. 766)
0% 100% 30s After the controller calculates that
end of curve staging is required, this
timer starts. If the condition continues
until the timer expires, a pump will be
staged off.
39-24 Flow Destage Value (Old
Par. 767)
0.0 999999.000GPM
227124.500 M3/h
0.000 If the flow per pump measured by the
flow meter is less than this value, the
controller will initiate the process of
staging off a pump, regardless of the
pressure feedback.
39-25 Flow Destage Proof Timer
(Old Par. 768)
0s 999s 0s When the controller initiates a flow
de-stage, this timer will start. If the
condition continues until the timer
expires, a pump will be staged off.
39-26 Flow Measurement Source
- No function
- Analog input 54
- Analog input X30/11
- Analog input X30/12
This parameter tells the controller
which analog input is connected to the
system flow meter.Input scaling for the
meter is defined in parameter group
P06-xx.
39-27 Flow Measurement Unit
- GPM
- M3/h
This parameter defines the units used
in measuring the sysem flow as well as
the units used in EOC calculation and
P39-20 and P39-24.
39-29 Measured Flow 0.0 999999.000GPM
227124.500 M3/h
This parameter displays the current
system flow from the flow meter
attached to the input selected by
parameter P39-26. Input scaling for the
meter is defined in parameter group
P06-xx.
39-3*
39-30
Transition Time (Old Par.
769)
0s 60s 20s
When the alternation timer determines
that it is necessary to stop one pump
and start another one, the controller will
first start the second pump and allow
both to run together for the time set by
this parameter. After this timer expires,
the pump that was initially running will
be stopped.
Table 6-2. Parameter 39-** Group, Detailed Description (continued)