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| Illustration 1 | g00321237 |
(1) Amber indicators (2) Red indicators (3) Switch for lamp test (4) Switch for alarm silence (5) Horn | |
The alarm module is a component which is located on the switchgear. Red indicators (2) and amber indicators (1) are the visual indicators. The horn (5) is an audible indicator. A 24 DCV battery system powers the ALM.
The alarm (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.
Description Of Operation
The ALM 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 ALM 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 exceeds 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, customer interface module (CIM), or relay driver module (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. "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 will flash at 0.5 Hz.
Indicator And Horn Operation
| Indicator And Horn Function | ||
| Color of the Indicator | NFPA 99 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 - The 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 indicates the switch that is the source of the signal.
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 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.
Modes of operation are listed in 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 be continuously illuminated.
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 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 |
| Mode | Terminal 5 | Terminal 6 | Terminal 8 | Terminal 9 | Terminal 10 | Terminal 11 |
| 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) |
| Remote Annunciator for the EMCP | (Float) | B(-) | (Float) | (B-) | (Float) | (Float) |
| ( 1 ) | NOTE: The connections that appear in parenthesis are required in order to select the mode that is specified . |
The annunciator module operates in one of the 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.