Unit Protection Devices
- Warning
- Equipment Damage and Risk of Injury
- The unit may start at any time without warning when the unit On/Off switch in the On position. Units equipped with a SG controller feature a Delayed Restart mode. The controller will make up to three (3) attempts every 20 minutes to restart the unit after a Delay Alarm has occurred. The Delayed Restart mode continues until the unit has been successfully restarted, or until a Shutdown Alarm is generated. Protection shutdown devices that cause an Delayed Restart shutdown condition include low oil pressure, low oil level, and high coolant temperature.
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Fuses: The electrical system is equipped with fuses for protection. See the Electrical Maintenance chapter for more information.
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Engine Coolant Temperature Sensor:The controller will stop the engine if the engine coolant temperature rises to 107 C (225 F) for more than 30 seconds. The controller also records an alarm. The unit will restart when the coolant temperature drops to 88 C (190 F).
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Low Oil Level Switch: An oil level switch closes if the oil level drops below 8 qts. (7.6 liters) and the oil pressure drops below 117 ± 21 kPa (Also see low oil pressure switch above). The controller will stop the engine if the switch stays closed for more than 30 seconds. The controller then records an alarm.
- Low Oil Pressure Switch: Engine oil pressure should rise immediately on starting. The controller will stop the engine if oil pressure drops below 117 ± 21 kPa, (1.17 ± 0.21 bar), (17 ± 3 psig) for more than 30 seconds, and the oil level drops below 8 qt (7.6 litres) (Also see oil level sensor below). The controller then records an alarm.