821528T 5 Mercury TOP COWL ASSEMBLY

Illustration 1 g00321237
(1) Amber indicators (2) Red indicators (3) Lamp test switch (4) Alarm silence switch (5) HornThe Alarm Module (ALM) is an attachment which is located on the instrument panel. Red indicators (2) and amber indicators (1) are the visual indicators. The Horn (5) is the audible indicator. A 24 VDC battery system or a 32 VDC battery system powers the ALM. There are six versions of the basic module. The modules are either alarm modules or a remote annunciator. The versions are listed below.
Standby NFPA 99 alarm module
The NFPA 99 remote annunciator is used with the standby NFPA alarm module.
The NFPA 110 standby alarm module is used with a NFPA 110 remote annunciator panel.
Prime power single engine alarm module
Prime power multiple engine alarm moduleThe only difference between these modules is in the graphics film on the front of the panel and the jumper wires on the rear. The NFPA 99 remote annunciator has a lamp test switch. The following description of operation refers to the alarm/remote annunciator module as the annunciator module. The ALM gives a warning of conditions that are becoming a problem. The warning occurs before conditions are severe enough to shut down the engine.An alarm fault develops while the generator set is running and when the Engine Control Switch (ECS) is in the COOLDOWN/STOP position or in the AUTO position. An alarm fault develops when the generator set is not running and when the ECS is in the COOLDOWN/STOP position or in the AUTO position. That fault is indicated by the optional alarm module or the remote annunciator. Description Of Operation
Note: In the following paragraphs, the annunciator can refer to the alarm module, or the annunciator can refer to the remote annunciator module. The annunciator receives data from the following items: switch inputs, internal circuitry and a serial data link from the Status Control Module (SCM).Switch Inputs
Four switch inputs are available for the switch connections. See Table 1.Internal Circuitry
Internal circuitry determines if the supply for VDC is too low. The setpoint is set at the factory at 24 VDC. Data Link
The annunciator module receives data from the SCM by a serial data link. The received data includes the following list.
Coolant temperature has exceeded the high temperature alarm setpoint that is programmed into the SCM.
Oil pressure is below the low oil pressure alarm setpoint that is programmed into the SCM.
Coolant temperature is below the low temperature alarm setpoint that is programmed into the SCM.
The ECS is not in the AUTO or MANUAL/START position.
Oil pressure is below the setpoint for a shutdown from low oil pressure that is programmed into the SCM.
Coolant temperature has exceeded the setpoint for a shutdown from high water temperature that is programmed into the SCM.
The engine has failed to start.
The engine speed exceeds the engine overspeed setpoint that is programmed into the SCM.
The engine is shut down due to a remote fault.
The engine is shut down due to a spare fault.
The engine is shut down due to an emergency stop fault.
The engine is 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. A maximum of three modules (alarm module, CIM, or RDM) can be connected to the serial data link. The maximum distance between a module and the SCM is 305 m (1000 ft). The data link will malfunction under the following conditions with multiple modules:
One of the modules is powered down. One of the modules is disconnected from the battery supply voltage or the return for the battery.
The module that is powered down remains connected to the data link.Under these conditions, the indicators that are controlled by the data link of the other modules will flash at 0.5 Hz.Indicator And Horn Operation
Table 1
Indicator And Horn Function    
Color of the Indicator     NFPA 99 ALM     NFPA 110 ALM     NFPA 99 RAN     Single Engine for Prime Power     Multiple Engine for Prime Power    
1 Amber     "High Coolant Temp Alarm"
"LI, H, LAT, TD"     "High Coolant Temp Alarm"
"LI, H, LAT, TD"     "GEN on Load"
"SW(3)"     "High Coolant Temp Alarm"
"LI, H, LAT, TD"     "High Coolant Temp Alarm"
"LI, H, LAT, TD"    
2 Amber     "Low Coolant Temp Alarm"
"LI, H, LAT"     "Low Coolant Temp Alarm"
"LI, H, LAT"     "Low Coolant Temp Alarm"
"LI, H, LAT"     "Low Coolant Level Alarm"
"SW(4), H"     "Low Coolant Level Alarm"
"SW(2), H"    
3 Amber     "Low Oil Press Alarm"
"LI, H, LAT"     "Low Oil Press Alarm"
"LI, H, LAT"     "Charger Malfunction"
"SW(4),TIM"     "Low Oil Press Alarm"
"LI, H, LAT"     "Low Oil Press Alarm"
"LI, H, LAT"    
4 Amber     "Low Fuel Level"
"SW(1), H"     "Low Fuel Level"
"SW(1), H"     "Low Fuel Level"
"SW(1), H"     "Low Oil Level"
"SW(1), H"     Low Oil Level
"SW(1), H"    
5 Red     "Not In Auto"
"LI, H"     "Not In Auto"
"LI, H"     "High Coolant Temp Shutdown" (1)
"LI, H, TD"     "Low VDC"
"INT, TIM"     "Not In Auto"
"LI, H"    
6 Red     "Low VDC"
"INT, TIM"     "Low VDC"
"INT, TIM"     "Low Oil Press Shutdown" (1)
"LI, H"     "Spare"
"SW(3)"     "Low VDC"
"INT, TIM"    
7 Red     "Spare"
"SW(3)"     "Charger Malfunction"
"SW(4),TIM"     "Overcrank Shutdown" (1)
"LI, H"     "Not Used"     "Spare"
"SW(3)"    
8 Red     "Spare"
"SW(4)"     "Air Dampner Closed" (2)
"SW(3),H"     "Overspeed Shutdown" (1)
"LI, H"     "Not Used"     "Spare"
"SW(4)"    
    "SW(2) Not Used"     "SW(2) Not Used"     "SW(2) Not Used"     "SW(2) Not Used"        
( 1 ) Latched by ECM
( 2 ) The switch is supplied by the customer.Table 1 uses the following abbreviations:ALM - Alarm ModuleH - The horn is sounded.INT - The signal source is internal to the module.LAT - "LATCHED" alarm faultLI - The data link from the SCM is the signal source.RAN - Remote AnnunciatorSW - One of four switches is the signal source. The number indicates the switch that is the source of the signal.TD - A ten second