Westerbeke 7.5 MCGA - Troubleshooting Failure to Start; Safety Shutdown Systems and LEDs

Operator Manual for Gasoline Generators 4 Startup and Basic Operation
page 17
4.7.4 Failure to Start
The start cycle will automatically terminate after 6-8 seconds of cranking. Three crank cycles can be attempted
before the ECU initiates a SPEED fault and prevents further crank cycle attempts. Investigate the cause of this
no-start, correct it, and reset the power to the ECU.
CAUTION: Prolonged cranking can result in the exhaust filling with water and possible backflow into the engine. This
could cause catastrophic damage to your generator/engine.
4.8 Safety Shutdown Switches and LEDs
The engine/generator is protected by switches and sensors that send signals to the ECU that it interprets as a
fault and automatically shuts down the generator engine. When an automatic shutdown occurs, one or two of
the control panel fault LED lights will illuminate indicating what fault caused the engine to shut down. To
correct the fault, see 6.2 Engine Troubleshooting.
NOTE: Do not attempt to re-start the generator before correcting the fault.
The LED fault shutdown display includes the following six LED light combinations that indicate to the operator
the cause of the engine automatic shutdown:
■
CHECK ENGINE
■
OIL PRESSURE
■
ENGINE TEMPERATURE
■
EXTERNAL ALARM
■
EXHAUST TEMPERATURE
■
SPEED (flashes)
The SPEED indicator flashes to indicate underspeed conditions and remains steady for overspeed.
If the generator shuts down from one of these faults, the fault LED remains illuminated. To reset the LED, the
DC breaker on the control box must be turned OFF and then back ON.
NOTE: The CHECK ENGINE light indicates a possible emissions control problem. Immediate action should be taken to
troubleshoot and correct this problem.
The EXT ALARM light indicates a fault with the fire suppression circuit. Troubleshoot the circuit to determine
the fault (the fire suppression circuit must be a closed when the circuit is active).
The 8-amp fuse protects the control panel from high amperage or short circuit condition.
The 15-amp DC circuit breaker protects the K1, K2, and K3 relays (closed circuit) from a high-amperage or
short-circuit condition.
4.8.1 Speed Sensor (Hall Effect)
A speed sensor is mounted on a bracket adjacent to the front crankshaft pulley. This sensor monitors pulley
rotation and sends a voltage signal to the ECU that interprets it as crankshaft speed.
■
If both speed LEDs are flashing, it indicates underspeed.
■
If both speed LEDs are illuminated (not flashing), it indicates overspeed.
■
If a speed threshold is reached, either overspeed or underspeed, the ECU shuts the unit down.
4.8.2 Oil Pressure Switch and Sender
An oil pressure switch is located on the right side of the oil filter mounting bracket. See Figure 24: Engine Oil
Filter, Oil Pressure Sender, and Oil Pressure Switch.