930203-0500 Tohatsu NUT

Illustration 1 g00825064
The alarm module (ALM) is standard. The ALM is located on the instrument panel. Amber indicators (1) are the visual indicators. The horn (5) is the audible indicator. The ALM is designed to be powered by only a 24 DCV battery system or a 32 DCV battery system. The alarm module (ALM) gives a warning of conditions that are becoming a problem. The warning occurs before conditions are severe enough to shut down the engine.If an alarm fault develops with the ECS in the COOLDOWN/STOP or AUTO positions, then the fault is indicated by the alarm module.Description of Change
The annunciator module receives data from switch inputs, internal circuitry, and a serial data link from the GSC. Switch Inputs
Four inputs are available as connections for the switch inputs. Switch inputs are activated when the inputs are connected to the battery negative terminal ("B-"). See Table 1.Internal Circuitry
Internal circuitry is used in order to determine if the DC battery supply voltage is too low. The setpoint is set at the factory at 24 DCV. Data Link
The annunciator module receives data from the generator set control (GSC) by a serial data link. The items that are included in this data stream of information are listed below.
Coolant temperature has exceeded the high temperature alarm setpoint that is programmed into the GSC.
Oil pressure is below the low oil pressure alarm setpoint that is programmed into the GSC.
Coolant temperature is below the setpoint for the low temperature alarm that is programmed into the GSC.
The engine control switch (ECS) is not in the MAN/START position or the AUTO position.
Oil pressure is below the setpoint for the low oil pressure shutdown that is programmed into the GSC.
Coolant temperature has exceeded the setpoint for the high water temperature shutdown that is programmed into the GSC.
The engine has failed to start.
The engine speed exceeded the setpoint for the engine overspeed that is programmed into the GSC.
The engine is shut down due to a coolant loss fault.
The engine shut down due to a spare fault.
The engine shut down due to an emergency stop fault.
The engine shut down due to a diagnostic fault.The first eight items control the operation of the indicators and horn. See Table 1 for more information. The last four items control the operation of the horn only. Indicator And Horn Operation
Table 1
Indicator And Horn Function    
Indicator Color     ALM    
1 Amber     High Coolant Temp Alarm
LI, H, LAT, TD    
2 Amber     Low Coolant Temp Alarm
LI, H, LAT    
3 Amber     Low Oil Press Alarm
LI, H, LAT    
4 Amber     Low Fuel Level
SW(1), H    
5 Amber     Not In Auto
LI, H    
6 Amber     Low DCV
INT, TIM    
8 Amber     High Fuel Level
SW(4)    
7 Amber     Fuel Rupture Basin Tank
SW(3)    
Table 2
ALM = Alarm Module    
H = Horn is sounded    
INT = The signal source is internal to the module    
LAT = LATCHED alarm fault    
LI = The data link from the GSC is the signal source    
SW = One of 4 switches is the signal source. The number in parentheses indicates which switch is the signal source.    
TD = A 10 second delay occurs before the fault is annunciated    
TIM = A 60 second delay occurs before the fault is annunciated    When an alarm fault occurs, the corresponding indicator flashes. The indicator flashes at two hertz and the horn sounds. If the alarm fault is NOT LATCHED, the indicator turns off when the alarm fault ceases. The horn also turns off when the alarm fault ceases. If the alarm fault is LATCHED, the indicator continues to flash until the "acknowledge/silence" input is activated. See Table 1 for LATCHED alarm faults as well as the indicator and horn functions for each operating mode. Switch input 3 (terminal 10) operates indicator 7. Switch input 4 (terminal 11) operates indicator 8. Switch input 3 and switch input 4 can be made to operate the horn. Connect terminal 10 ("sw input 3") to terminal 3 and connect terminal 11 ("sw input 4") to terminal 4. Alarm Silence
Activating the alarm silence switch (4) causes the horn to cease. The indicator stays on continuously.Data Link Malfunction
If the data link malfunctions, the indicators that are controlled by the data link flash at 0.5 hertz. The switched indicators function normally. Lamp Test
Activating the lamp test switch (3) results in sounding the horn and turning on all indicators continuously for 10 seconds or until the switch is deactivated. Mode Selection
Table 3
Mode Selection And Switch Input Connections (1)    
Input     Mode SEL1     Mode SEL2     Switch 1     Switch 2     Switch 4     Switch3    
Terminal     5     6     8     9     11     10    
   
Mode                            
NFPA 99 Alarm     (Float)     (Float)     Low Fuel Level     (Float)