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| Illustration 1 | g00321237 |
(1) Amber indicators (2) Red indicators (3) Lamp test switch (4) Alarm silence switch (5) Horn | |
The 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 module
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 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
| 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 Module
H - The horn is sounded.
INT - The signal source is internal to the module.
LAT - "LATCHED" alarm fault
LI - The data link from the SCM is the signal source.
RAN - Remote Annunciator
SW - One of four switches is the signal source. The number indicates the switch that is the source of the signal.
TD - A ten 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 Hz 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. Refer to Table 1 for alarm faults that are latched. See Table 1 for the indicator and horn functions for each operating mode.
Refer to Table 2. Normally, the input to switch (3) (terminal 10) and the input to switch (4) (terminal 11) only operate indicator 7 and indicator 8. However, the input to switch (3) and the input to switch (4) can also operate the horn. Connect terminal 10 (the input to switch (3) ) to terminal 3 and connect terminal 11 (the input to switch (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 Hz. 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 ten 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 |
| NFPA 110 Alarm | Float | B | Low Fuel Level | Float | Closed Air Damper | Charger Malfunction |
| NFPA 99 RAN | B | Float | Low Fuel Level | Float | Genset On Load | Charger Malfunction |
| Single Engine for Prime Power | Float | Float | Low Oil Level | B | Spare | Low Coolant Level |
| Multiple Engine for Prime Power | B | B | Low Oil Level | Low Coolant Level | Spare | Spare |
| ( 1 ) | NOTE: In order to select the specified mode, the connections that appear in "parenthesis" are required. |
The annunciator module operates in one of the two modes that are described in Table 2. The modes are selected by connections that are made to the mode select inputs and switch (2). The mode select inputs are terminals 5 and 6. The input to switch (2) is terminal 9. See Table 2.
Remote Annunciator (RAN) Panel NFPA 110
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| Illustration 2 | g01589960 |
(6) Horn (7) Alarm indicator (8) Alarm silence switch | |
When an alarm fault occurs the horn on alarm module (5) and horn (6) on the RAN will sound. Indicator (7) on the RAN panel will illuminate. The corresponding alarm fault indicator will illuminate.
When a switch for alarm silence is activated the following conditions will occur:
- The alarm indicator (7) will turn off.
- The remaining alarm indicator(s) will not turn off.