PPI SMART ROLL - Converting Pulses to Belt Speed

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There are several options in this case.
• Select a roll with a lower number of pulses per revolution. If you are using a Smart Roll with 6 pulses per revolution, switch to a 2
pulse or 1 pulse per revolution Smart Roll. The PLC will have more time between pulses and longer pulse duration. This is the preferred
method.
• Reprogram the PLC or electronics to a faster sampling rate and/or longer sampling durations.
• Change to a larger diameter roll. If you are using a 5” diameter Smart Roll without lagging, switch to a roll with ¼” of lagging to make
the Smart Roll 5.5” diameter, or switch to a 6” diameter Smart roll with or without lagging.
CONVERTING PULSES TO BELT SPEED?
The following equation can be used to convert Smart Roll pulses to belt speed.
D = Roller Outside Diameter including lagging, in inches.
count = Number of pulses counted in the sampling time period.
Time = Sampling time period in seconds.
#pulse = Number of pulses per revolution of the Smart Roll (1, 2, or 6).
fpm = belt speed in feet per minute.
Duration = 0.85
= 0.85
7.854 (D)
fpm (#pulse)
– 0.004
(
)
π (D) 60
fpm (#pulse)12
– 0.004
(
)
x
1
2
fpm = =
15.708 (count) (D)
Time (#pulse)
(
)
π (count) (D) 60
Time (#pulse)12
(
)