FOXBORO FBM203 P0914SV Pulse input module

Stop cranking. Check for shorted or grounded actuator leads by removing wires to terminals 9 and 10. Close terminal 4, short terminal 11 to 12. Check for 18 to 22 volts at terminals 9 and 10 for forward acting controls and 0 to 1 volts for reverse acting controls. While cranking, check for at least 1 Vrms at terminals 7 and 8, and at least 30 to 80 Hz. If these readings are not available close terminal 4 to override failed-speed signal while cranking. MPU sensor spaced too far from gear. Make sure there are no metal chips on end of pickup. Check MPU wiring and shields. Speed setting too low on initial start. Control may be set for the wrong speed range. Check speed sensor frequency versus control part number. Speed setting may be lower than cranking speed. Control should be set for rated speed. Increase RATED SPEED setting clockwise (cw).

MPU not supplying signal to control. 

Check MPU wiring for proper connection, check shields for proper installation. Magnetic pickup may be open-circuited or shorted. Check resistance with the leads disconnected from the control. Resistance should be about 100 to 300 Ω.Check switch at terminal 3. Minimum-fuel contact must be closed for normal operation. Check for 0 to 3 Vdc from terminal 2 (+) to 3 (–) on low-voltage controls. (Between terminals 6 (+) and 3 (–) on high-voltage controls.

Terminals 11 and 12 are open. 

Verify that terminals 11 and 12 are jumpered if optional external speed trim is not used. Check the voltage from terminal 11 (+) to 12 (–). It should be less than 2 volts. Faulty speed trim potentiometer. With power OFF, check speed-trim potentiometer with an ohmmeter. Faulty 2301A Speed Control. Replace unit. Prime mover overspeeds only on starts. Ramp adjustment. Increase RAMP TIME (cw). This decreases acceleration rate (from low idle to rated.) RATED SPEED setting too high. Set RATED SPEED as described in Chapter 3. Amplifier adjustment. 2301A may be adjusted for sluggish operation, causing overspeed on start. Slowly adjust GAIN for fastest stable response. RESET may be adjusted too low. Increase RESET setting.

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