Dynalco MTH-103D Tachometer / Hourmeter / Overspeed Trip - Manual (Page 10)

10 MTH-103D Installation and Operation Manual
1.5.5 ProG? (Configuration or Run) Screen
The next screen will display “ProG?”. This screen allows the user to enter the
CONFIGURATION mode or the RUN mode.
a. To set, momentarily press and release the push button to return to the
CONFIGURATION mode
or …
b. Press and hold the push button for at least ten (10) seconds to enter
the RUN mode.
1.6 Recommended Pickup/RPM Conversion
The following chart depicts minimum surface speed in inches (centimeters) per
second at which the MTH-103D will power up for various pickups and pitches. A
0.010 inch (0.0254 centimeter) gap is used. If a larger gap is used, the surface
speeds required will be higher.
Surface speeds in inches (centimeters) per second:
4 pitch(module) 6 pitch(module) 8 pitch(module)
M107 .......... 225 (571.5) ................ 223 (566.4) ............ 261 (662.9)
M204 .......... 319 (810.2) ................ 329 (835.6) ............ N/A
M205 .......... 111 (281.9) ................ 94 (238.7) ............ 105 (266.7)
M207 .......... 133 (337.8) ................ 128 (325.1) ............ 146 (370.8)
M208 .......... 87 (220.9) ................ 84 (213.3) ............ 96 (243.8)
To compute the RPM at which the MTH-103D will power up on an application:
1. Determine the circumference (in inches or centimeters) of the gear being
sensed (diameter times 3.14).
2. From the chart above, find the appropriate “inches (centimeters) per sec-
ond” value for the pickup and pitch/module used.
3. Divide this value by the gear circumference.
4. Multiply by 60.
The drawings on pages 10 and 11 show the proper
CSA approved setup for the MTH-103D.