The shaft driving the incoming roller is turning at 1000 rpm, and the shaft driving the outgoing roller
is turning at 1250 rpm.
You want the tachometer to:
1. Compute Speed A (Incoming roller) and Speed B (out-going roller) in FPM.
SF fpm = 60 x π x D’ = 60 x 3.1416 x 3’ = 565.4880
PPR 48 48
C1 = 565.5
C2 = 48.00
C3 = 565.5
C4 = 48.00
2. Send the percentage of elongation to Display, ratio to Setpoints I and 2, and Speed B only to
Analog Output.
C11 = x 5 5 2 9
3. Have Display show FPM with autoranging fixed to one decimal place.
C
5 =1000
C
12 = 1
4. Have the Analog Output drive an auxiliary 4 - 20mA recorded which has a range of 0 to 5000fpm.
20mA
4mA
0 fpm 5000
C6 = 0000 C12 = 1
C7 = 5000 blank
5. Use the setpoints for web break detection, with Setpoint 1 going to alarm if the ratio is less than
0.5, and Setpoint 2 going to alarm if the ratio is less than 1.0. Relays are latching.
C8 = 0.500
C9 = 1.000
C10 = x 0 0 0 0 (no hysteresis)
C12 = x 5 5 1
autoranging fixed to one decimal place
latching relay
latching relay
analog output is 4 - 20mA
12
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