Usage:
Alarm Modules
The alarm module (ALM) is an attachment located in the center of the control panel. Visual indication is by means of red LED's (2) and amber LED's (1). Audible indication is by means of a horn (3).
Alarm Module (NFPA 110 ALM)
(1) Amber LED's. (2) Red LED's. (3) Horn. (4) Acknowledge/silence switch.
The purpose of the alarm modules (ALM) is to give a warning of conditions that can become a problem before they are bad enough to shut down the engine or keep it from starting.
If, with the ECS in the "COOL DOWN/STOP" or "AUTO" positions, an alarm condition develops prior to or while the generator set is running, that condition will be annunciated by means of the optional alarm module and/or the remote annunciator.
One basic alarm module is used to satisfy the requirements of standby NFPA 99 alarm module, standby NFPA 110 alarm and NFPA 99 remote annunciator. The only differences between these modules is in the graphics film on the front of the panel and the jumper wires on the rear (see the DC Schematic). The NFPA 99 remote annunciator also has a lamp test switch. The following description of operation refers to the alarm/remote annunciator module as the annunciator module.
Description Of Operation
The annunciator module receives data from three sources: switch inputs, internal circuitry, and a serial data link from the engine control module.
Switch Inputs:
Up to four inputs are available to connect switches (i.e., Low Fuel Level) too. (See Table 1)
Internal Circuitry:
Internal circuitry is used to determine and annunciate if the supply voltage is below a setpoint.
Data Link:
The annunciator module receives data from the engine control module by means of a serial data link. The information included in this data stream includes:
- 1. Coolant temperature has exceeded the high temperature alarm setpoint programmed into the engine control module.
- 2. Oil pressure is below the low oil pressure alarm setpoint programmed into the engine control module.
- 3. Coolant temperature is below the low temperature alarm setpoint programmed into the engine control module.
- 4. The engine control switch is not in the "AUTO" or "RUN" position.
- 5. Oil pressure is below the low pressure shutdown setpoint programmed into the engine control module.
- 6. Coolant temperature has exceeded the high coolant temperature shutdown setpoint programmed into the engine control module.
- 7. The engine failed to start (overcrank).
- 8. The engine speed exceeded the overspeed setpoint programmed into the engine control module.
- 2. Oil pressure is below the low oil pressure alarm setpoint programmed into the engine control module.
- 9. The engine shut down due to a remote fault condition.
- 10. The engine shut down due to a spare fault condition.
- 11. The engine shut down due to an emergency stop condition.
- 12. The engine shut down due to a diagnostic fault condition.
- 10. The engine shut down due to a spare fault condition.
Data items 1 through 8 control the operation of the LED's and the horn as indicated in table 1. Data items 9 through 12 control the operation of the horn only.
LED And Horn Operation:
When an alarm condition occurs, the LED corresponding to that condition will flash at 2 hertz and the horn will sound. If the alarm condition is "NOT LATCHED", the LED and horn will turn off as soon as the alarm condition ceases. If the alarm condition is "LATCHED", the LED will continue to flash until the acknowledge/silence input is activated. See table 1 for "LATCHED" alarm conditions, LED and horn functions for each operating mode.
Acknowledge/Silence:
Activating the acknowledge/silence switch (4) causes the horn to cease and the LED to stay on continuously.
Data Link Malfunction:
If the data link malfunctions, the LED's controlled by the data link will flash at 0.5 hertz. The switch controlled LED's will function normally.
Lamp Test:
Activating the lamp test switch results in sounding the horn and turning on all LED's continuously for 10 seconds or until the switch is deactivated.
Mode Selection:
The annunciator module operates in one of the three modes described in Table 1. The modes are selected by means of connections made to the mode select inputs (terminals 5 and 6) and switch 2 input (terminal 9) as shown in Table 2.
Remote Annunciator Panel Operation (NFPA 110)
NFPA 110 Remote Annunciator Panel
(5) Trouble light. (6) Horn. (7) Acknowledge/silence switch.
This remote panel functions in conjunction with the NFPA 110 alarm module. The alarm module is mounted in the center of the control panel. When an alarm occurs on the alarm module or a fault occurs on the ECM horns (3) and (6) will sound in both the alarm module and the remote annunciator and trouble light (5) will light in the remote annunciator panel. The appropriate alarm LED will also light in the alarm module or the appropriate fault LED will light in the engine control module (ECM) portion of the Electronic Modular Control Panel (EMCP).
When the alarm acknowledge/silence switch (4) or (7) is pressed on either the remote panel or the alarm module, the horns on both will cease sounding. Trouble light (5) on the remote panel will also go out. The LED on the alarm module or ECM will remain on. Another fault or alarm condition will reactivate the horns, LED and light as before.
Trouble light (5) also acts as a test switch on the remote panel. When light (5) is pushed, horn (6) and light (5) will come on. The alarm module is not affected by the test switch.
Alarm Module (NFPA 110 ALM)
(1) Amber LED's. (2) Red LED's. (3) Horn. (4) Acknowledge/silence switch.