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| Illustration 1 | g00321237 |
Alarm Modules (1) Amber indicators. (2) Red indicators. (3) Lamp test switch. (4) Alarm silence switch. (5) Horn. | |
The ALM is an attachment. The ALM 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 DCV battery system or a 32 DCV battery system powers the ALM.
The modules are either alarm modules or a remote annunciator. The versions are listed below.
- Alarm Module
- Remote Annunciator
The only difference between these modules is in the graphics film on the front of the panel and the jumper wires on the rear. The remote annunciator has a lamp test switch. The following description of operation refers to the alarm/remote annunciator module as the annunciator module.
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.
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 engine control switch (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 GSC.
Switch Inputs
Four switch inputs are available for the switch connections. Switch inputs that are connected to ground "B-" will be active. See Table 1.
Internal Circuitry
Internal circuitry determines 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 GSC 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 GSC.
- Oil pressure is below the low oil pressure alarm setpoint that is programmed into the GSC.
- Coolant temperature is below the low temperature alarm setpoint that is programmed into the GSC.
- The ECS is not in the AUTO or MAN/START position.
- Oil pressure is below the low oil pressure shutdown setpoint that is programmed into the GSC.
- Coolant temperature has exceeded the high water temperature shutdown setpoint that is programmed into the GSC.
- The engine has failed to start.
- The engine speed exceeded the engine overspeed setpoint that is programmed into the GSC.
- The engine is shut down due to a coolant loss 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 GSC is 305 m (1000 ft).
The data link will malfunction under the following conditions with multiple modules:
- One of the modules is powered down.
- The module that is powered down remains connected to the data link.
Under these conditions, the indicators of the other modules, that are powered up, will flash at 0.5 hertz.
Indicator And Horn Operation
| Indicator And Horn Function | ||
|---|---|---|
| Indicator Color | ALM | EMCP RAN |
| 1 Amber | 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 |
| 3 Amber | Low Oil Press Alarm LI, H, LAT |
Low Oil Press Alarm LI, H, LAT |
| 4 Amber | Low Fuel Level SW(1), H |
Not In Auto LI, H |
| 5 Red | Not In Auto LI, H |
High Coolant Temp Shutdown (1) LI, H, TD |
| 6 Red | Low DCV INT, TIM |
Low DCV INT, TIM |
| 7 Red | Spare SW(3) |
Overcrank Shutdown (1) LI, H |
| 8 Red | Spare SW(4) |
Overspeed Shutdown (1) LI, H |
| SW(2) Not Used | ||
| ( 1 ) | Latched by the GSC |
The above table lists the following abbreviations.
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.
RAN - Remote Annunciator
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 time 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 1for LATCHED alarm faults as well as the indicator and horn functions for each operating mode.
Normally, switch input (3) (terminal 10) and switch input (4) (terminal 11) only operate indicator (7) and indicator (8). However, switch input (3) and switch input (4) can also 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. Also, activating the alarm silence switch (4) causes the indicator to light continuously.
Data Link Malfunction
If the data link malfunctions, the indicators that are controlled by the data link flash at 0.5 hertz. The indicators that are controlled by the switches 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
| Mode Selection And Switch Input Connections (1) | ||||||
|---|---|---|---|---|---|---|
| Input | Mode SEL1 | Mode SEL2 | Switch 1 | Switch 2 | Switch 3 | Switch 4 |
| Terminal | 5 | 6 | 8 | 9 | 10 | 11 |
| Mode | ||||||
| NFPA 99 Alarm | (Float) | (Float) | Low Fuel Level | (Float) | Spare | Spare |
| EMCP RAN | (Float) | ("B-") | (Float) | ("B-") | (Float) | (Float) |
| ( 1 ) | NOTE: Connections in parentheses are required to select the mode specified |
The annunciator module operates in one of the two modes described in Table 2. The modes are selected by connections made to the mode select inputs (terminals 5 and 6) and switch (2) input (terminal 9) as shown in Table 2.