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| Illustration 1 | g00321237 |
Alarm Module (1) Amber indicators. (2) Red indicators. (3) Lamp test switch. (4) Alarm silence switch. (5) Horn. | |
The alarm module (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. The ALM is designed to be powered by only a 24 DCV battery system or a 32 DCV battery system.
There are six versions of the basic module. The modules are either alarm modules or a remote annunciator. The term "remote annunciator" is used but the annunciator is the same basic alarm module. The versions are listed below.
- NFPA 99 Standby alarm module.
- A NFPA 99 remote annunciator which is used with a standby NFPA 99 alarm module.
- NFPA 110 Standby alarm module which is used with NFPA 110 remote annunciator panel. See Systems Operation, "Alarm Module Control (NFPA 110)".
- Prime power single engine alarm module .
- Prime power multiple engine alarm module.
- EMCP II 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 of the panel. See the Testing And Adjusting, "DC Schematic". The NFPA 99 remote annunciator and the remote annunciator for the EMCP II have a lamp test switch.
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 optional alarm module and/or the remote annunciator.
Description of Change
Note: In the following description, the word "annunciator" may mean alarm module or remote annunciator module.
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 the horn. See Table 1 for more information. The last four items control the operation of the horn only.
A maximum of three modules are connected to the serial data link: alarm, CIM and RDM. 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. ("B+" or "B-" is disconnected.)
- 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 that are powered up will flash at .5 Hz.
Indicator And Horn Operation
| Indicator And Horn Function | ||||||
| Indicator Color | NFPA 99 ALM | NFPA 100 ALM | NFPA 99 RAN | Prime Power Single Engine | Prime Power Multi-Engine | EMCP RAN |
| 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 |
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(2), H |
Low Coolant Level Alarm SW(2), H |
Low Coolant Temp Alarm LI, H, LAT |
| 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 |
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 |
Not In Auto LI, H |
| 5 Red | Not In Auto LI, H |
Not In Auto LI, H |
High Coolant Temp Shutdown (1) LI, H, TD |
Low DCV INT, TIM |
Not In Auto LI, H |
High Coolant Temp Shutdown (1) LI, H, TD |
| 6 Red | Low DCV INT, TIM |
Low DCV INT, TIM |
Low Oil Press Shutdown (1) LI, H |
Spare SW(3) |
Low DCV INT, TIM |
Low DCV INT, TIM |
| 7 Red | Spare SW(3) |
Charger Malfunction SW(4), TIM |
Overcrank Shutdown (1) LI, H |
Not Used | Spare SW(3) |
Overcrank Shutdown (1) LI, H |
| 8 Red | Spare SW(4) |
Air Damper Closed (2) | Overspeed Shutdown (1) LI, H |
Not Used | Spare SW(4) |
Overspeed Shutdown (1) LI, H |
| SW(2) Not Used | SW(2) Not Used | SW(2) Not Used | SW(2) Not Used | |||
| ( 1 ) | Latched by the GSC |
| ( 2 ) | Air Damper Switch to be supplied by customer. |
| 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 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 the horn functions for each operating mode.
Normally switch input 3 (terminal 10) and switch input 4 (terminal 11) only operate indicators 7 and 8. However, switch inputs 3 and 4 can be made to also operate the horn. Connect terminal 10 (switch input 3) to terminal 3 and connect terminal 11 (switch input 4) to terminal 4.
Alarm Silence
Activating the alarm silence switch (4) causes the horn to cease and the indicator to stay 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 switch controlled 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
| 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) | Air Damper Closed | Charger Malfunction |
| NFPA 99 Remote Annunciator | (B-) | (Float) | Low Fuel Level | (Float) | Gen On Load | Charger Malfunction |
| Prime Power Single Engine | (Float) | (Float) | Low Oil Level | (B-) | (Spare) | Low Coolant Level |
| Prime Power Multi Engine | (B-) | (B-) | Low Oil Level | Low Coolant Level | (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 six modes described in Table 3. 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 3.