Instrument Panel Switches
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| Illustration 1 | g00474506 |
Instrument Panel Switches (1) SP: speed potentiometer. (2) ECS: engine control switch. (3) SAS: start aid switch (optional). (4) VAR: voltage adjust rheostat. (5) ESPB: emergency stop push button. (6) PLS: panel light switch (optional). | |
Engine control switch (ECS) (2) determines the status of the control panel. In the AUTO position (3 o'clock), the GSC allows the engine to start whenever the remote initiating contact (IC) is closed. The engine also shuts down after the initiate contacts open. A cooldown time is programmable to give a 0 to 30 minute cooldown period before the engine shuts down. The cooldown time is factory set at five minutes. In the MANUAL START position (6 o'clock), the engine starts and runs as long as the ECS is in this position. In the COOLDOWN/STOP position (9 o'clock), the fuel solenoid shuts the engine down after cooldown. In the OFF/RESET position (12 o'clock), the engine shuts down immediately and any fault indicators are reset (except emergency stop).
If red emergency stop push button (ESPB) (5) is pressed, the fuel is shut off. To restart: turn ESPB (5) clockwise until it releases, turn the ECS to OFF/RESET and then to MANUAL START.
Voltage adjust rheostat (VAR) (4) is used to adjust generator voltage to the desired level.
The speed adjust potentiometer (SP) (1) controls the engine speed.
Optional panel light switch (PLS) (6) turns the panel lamps ON and OFF.
The start aid switch (SAS) (3) allows the engine ECM to control the ether injection system that improves the cold starting performance of a 3500B engine. The AUTO position is the normal position of the switch. The system is always in auto mode unless the switch is held in manual. Two operation modes of the ether injection system exist:
- Manual: The manual position is momentary and the SAS must be held in this position in order to allow the ether system to operate in manual mode. Manual mode allows ether to be injected for a maximum of 130 seconds whenever the engine coolant temperature is less than 30°C (86°F) and the engine speed is greater than 50 rpm.
- Automatic: This is the normal position of the SAS. The ether system is in automatic mode without operator input whenever the engine is started. In automatic mode, ether will be injected for a minimum of 15 seconds whenever the engine coolant temperature is less than 30°C (86°F) and the maximum of 130 seconds at -50°C (-58°F). The automatic ether injection system is disabled whenever the engine rpm exceeds 400 rpm or the engine coolant temperature exceeds 30°C (86°F).