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If the rate application is to display a specific display unit, it is only
necessary to know the number of pulses per desired display unit/s (feet,
revolutions, etc.) and in the desire time format, per second (1), per minute
(60), or per hour (3600) to scale the rate display. Use the following formula
to calculate the rate input value.
rAtE INP (Hz) = rAtE dSP x __Pulses per unit__
WHERE:
rAtE INP =
rAtE dSP =
Pulse per unit = Number of actual input pulses
Desired Time Format Select
- Per Seconds = 1
- Per Minute = 60
- Per Hour = 3600
EXAMPLE: Display is to indicate 1575 revolutions per minute (RPM).
Input pulses are 39 pulses per revolution.
rAtE INP (Hz) = 1575 RPM x 39PPR
Since the rate input value can only be programmed in tenths, the value
is recalculated by increasing the rate display value by a factor of ten. The
display value is continually increased until one of the following is reached.
- The rAtE INP valuse‟s least significant digit is no similar than a tenth
- The rAtE dSP value exceeds 999,999
- The rAtE INP value exceeds 99,999.9
Note: For two and three, use the value that was calculated prior to
exceeding that value.
rAtE INP (Hz) = 15750 RPM x 39PPR
15750 is entered for the rAtE dSP
10237.5 is enterd for the rAtE INP
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desired time format
Rate input Value (Hz)
Desired rate display value
60
= 1023.75
60
= 10237.5
WISCO DP21 Manual V1.1
Edited: 18/03/2016
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, www.wisco.co.th,
info@wisco.co.th
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