Check Low Speed RPM
engine
Description
Low engine speed was requested, but engine rpm stayed below 1200 rpm or above 1500 rpm for over 60 seconds, and the unit gives alarm only.
Activation Conditions
The control system is calling for low engine speed operation, and engine speed is less than 1200 rpm or greater than 1500 rpm for more than 60 seconds (120 seconds when the control system calls for a change from high to low speed, or when unit first starts).
Unit Behavior
Alarm only.
Reset Conditions
Auto reset if control system is calling for low engine speed operation and signal is within 1220 and 1480 rpm for 60 seconds or alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.
Corrective Actions
1. Force Low Speed Operation: Set the High Speed Delay Functional Parameter to 10 minutes and restart unit. (Reset following testing) System should run in low speed. (If not, check speed overrides, Section 4.11.2.) Ensure System is calling for low speed when performing steps 3 and 4. 2. Check Engine Speed a. Check actual engine speed using hand held tachometer. Speed must be within range shown above. b. Compare actual speed with that shown in Unit Data. Readings must be within ± 50 rpm. 3. Check Fuel/Speed Actuator (FSA): Check FSA plunger. Must move in and out freely. Refer to engine workshop manual. 4. Check Engine Air-Intake System a. Check air cleaner indicator. Flag must not be visible. b. Inspect air intake system. Verify hoses and tubes in good condition, with no kinks or restrictions. 5. Check Engine Exhaust System: Inspect the exhaust system. Must be clear and unobstructed.