Carrier RG2059 Series - Safety Devices; Table 2-4 Safety Devices

T-361 2–10
2.9 SAFETY DEVICES
Safety devices, such as circuit breakers, fuses, and safety switches, protect system components from damage.
The AC generator, solid state battery charger, fuel heater, high water temperature, safety relay, total time meter
and intake heater are protected by circuit breakers. If a safety device opens and there is an interruption of electrical
current, the electronic governor module will be de−energized, which will also de-energize the fuel solenoid, inter-
rupt the fuel flow to the engine and stop the engine.
In units with auto restart, the engine, engine control devices, and engine monitoring devices are protected by the
auto restart module, circuit breaker, low oil pressure switch, and high water temperature switch. These safety
devices monitor system operating conditions and open a set of electrical contacts when an unsafe condition
occurs. If a safety device opens and there is an interruption of electrical current, the electronic governor module will
be de-energized, which will also de-energize the fuel solenoid, interrupt the fuel flow to the engine and stop the
engine.
De-energizing the fuel solenoid shuts off the fuel supply to the engine; thus stopping the engine. Safety device
specifications are provided in Table 2–4.
Table 2–4 Safety Devices
ENGINE
Unsafe
Condition:
Low engine lubricating oil pressure
Safety Switch Low oil pressure switch (LOP) - Automatic reset
Switch Setting Opens below 18 psig (1.27 kg/cm)
Unsafe
Condition:
High engine cooling water temperature
Safety Switch Water temperature switch (HWT) - Automatic reset
Switch Setting Opens at 230F (110°C)
Unsafe
Condition:
Excessive current draw by the safety relay, fuel heater, water temperature gauge, oil pressure
gauge or total time meter
Safety Switch Circuit breaker (CB-2) − Automatic reset
Switch Setting Trips at 30 amps
Unsafe
Condition:
Excessive current draw by the electronic governor module
Safety Switch Fuse 1, 2, 3 (replace)
Switch Setting Trips at 10 amps
INTAKE HEATER
Unsafe
Condition:
Excessive current draw on intake heater circuit
Safety Switch Circuit breaker (CB-3) - Automatic reset
Switch Setting Trips at 50 amps
BATTERY CHARGER
Unsafe
Condition:
Excessive current draw on 12 volt supply circuit.
Safety Switch Circuit breaker (CB-4) - Automatic reset
Switch Setting Trips at 50 amps
Unsafe
Condition:
Excessive current draw on 460 volt feed circuit
Safety Switch Fuses BCF3, BCF4, BCF5 (replace)
Switch Setting Trips at 5 amps