Understanding the batch cycle
Page 15
April 2017
CTL-UM-01028-EN-03
MPOOTANT
I
The CB-30 is programmed at the factory with a pulse fail-safe period of three seconds. This means that if a transmitter pulse is not
received within three seconds of a START command or the last pulse, (in the middle of the batch) the valve will close and the display
to the left will start blinking. After correcting the problem (bad transmitter, valve or pump) press
RESET
to start over.
Determining the Compensation Value
When a slow closing valve is used, (to prevent water hammer) the CB-30 can be programmed to begin closing the valve ahead
of time to compensate for the water overrun during the closing period
To determine the amount of overrun, run one or two batches with the CB-30 without a compensation value and without a
wash value
1 Preset a typical batch (250 gallons)
2 Press
STAOT
and let the batch run
The counter will count down to zero, and if there is an overrun, the counter will display the amount as a negative number
(for example, –5 This is the number that must be programmed to compensate for valve overrun
3 To program, press
COMP
, enter
5
, then press
ENTEO
The CB-30 will begin closing the valve 5 gallons prior to the Batch and Wash preset values that are programmed On the
second test batch, the counter may actually stop short of zero (for example, at 1) This indicates that the compensation value
must be changed from 5 to 4 gallons
Determining the Scale Factor
The scale factor is a number that multiplies the incoming pulses from the flow meter It converts them to desired units of
measure such as US gallons, liters, imperial gallons or pounds
To determine the appropriate factor for the type and model of flow meter in use, apply the following formula:
1 gallon (liters, etc )
=
Scale Factor
Pulse rate (liters, etc )
Example: For a 3" Turbo, the pulse input coming from
the PFR-3E transmitter is 24 8 pulses per gallon
Therefore:
1 gallon
=
0.0403
24 8 pulses per gallon
To set the scale factor:
1 Press
SCALE
2 Enter
0403
3 Press
ENTEO
The scale factor will appear as follows:
0
in the left display and
403
on the right display
Turbo
Size
Pulses per
Gal
Scale Factors
PFT-3E
2"
34 72
0 0288
3"
24 80
0 0403
4"
5 12
0 1953
6"
2 16
0 4629
Table 9: Scale Factor
