Operation
Apply power from either:
a. A signal frequency generator or a magnetic pickup (minimum 4.0 VRMS;
maximum 15 VRMS) connected to terminals (A) and (B) (no polarity).
Or…
b. 9 – 30 VDC power source connected to terminals (1)(+) and (4)(–).
(minimum 1.5V RMS pickup input signal required).
The software revision number will display for one second when power is initially applied.
Alarm / Shutdown Output
The MTH-103E will alarm or shutdown when the RPM is above or below limits as specified. If
an alarm condition is met, an alarm indication on the display will blink and the digital output
will trip. The alarm / shutdown triggers a TRIAC rated at 150 mA for switching either an
annunciator input or an external relay. This TRIAC is similar to the SCR used in the previous
version MTH-103D in that current flow must be removed to reset the TRIAC.
Below are the steps to reset the alarm and TRIAC
1. Lower the rpm below ‘high threshold’ and above the ‘low threshold’.
2. Press the ‘Enter/Fn’ key to reset the alarm.
3. Short ‘Pin 5’ and ‘Pin 6’ at output terminals to reset the TRIAC.
WARNING:
Terminal connection screws to be tightened to 8 inch-pounds torque.
The alarm / shutdown output should be tested monthly for proper operation, especially
if being used for engine overspeed shutdown or other critical function.
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