GEAR GP-REAR 4754924 - Caterpillar

Introduction
The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.Problem
Early hour failure of the 356-5379 Alarm Module Gp. The failure mode is typically the module has no lights, unable to communicate, does not work, and internal defect open-shorted. Alarm panel inoperable, found green light flashing at bottom and RS485 annunciator circuit failed.Solution
Removed the original 356-5379 Alarm Module Gp and replaced with a new 356-5379 Alarm Module Gp.Reference: Application & Installation Guide, LEBE0006, EMCP 4.1, 4.2 GENERATOR SET CONTROLReference: Application & Installation Guide, LEBE0007, Cat® EMCP 4.3 and 4.4 Generator Set Control.RS-485 Annunciator
The RS-485 Annunciator uses a custom master-slave communication protocol. The EMCP 4 controller will be the Master, and the RS-485 Annunciator(s) will be the slave(s). Configuration takes place within the EMCP 4. In Local application, the RS-485 Annunciator may be mounted on the Package generator set with the EMCP 4 to provide a complete package-mounted monitoring solution. The RS-485 Annunciator may also be mounted separately from the generator set to provide Remote indication of system operating and alarm conditions. The number of RS-485 Annunciators is limited by the RS-485 standard.Network Communications Interface
EMCP 4 provides a dedicated, fully isolated RS-485 SCADA Data Link (Half Duplex) separate from the MODBUS port used on the EMCP 4
Operates at 19200 bits per second
Configuration is accomplished with the Cat Service Tool by connecting to the EMCP 4
RS-485 Annunciator communication is not compatible with third-party devices.Annunciator Electrical Specifications
Control Power 12 VDC and 24 VDC nominal (9 VDC through 32 VDC acceptable)
Reverse voltage capability is -32 VDC for 1 hour at 70° C (158° F)
Over voltage capability is 80 VDC for 2 minutes at 70° C (158° F)
Single, 8-pin connector provides both power and communication
Designed to meet relevant European standards for EMI/RFI/Immunity without the use of external filteringRS-485 ANNUNCIATOR CUSTOM ALARM GROUP CONFIGURATION
The RS-485 Annunciator LED is field-programmable by the EMCP 4 via the Cat Service Tool when configured for Alarm Group’s 01 and 02. Alarm Group’s 01 and 02 support customization of the 32 events for the 16 LED’s.The service tool software must be installed on a Windows PC.The Cat communication adapter must be connected between the PC and the CAN Primary data link on which the target EMCP 4 is connected.RS-485 ANNUNCIATOR ALARM GROUPS
The RS-485 Annunciator supports four different Alarm Groups. Alarm Group 01, 02, 03, and Alarm Group 04. Two of these Alarm Groups, 03 and 04, are fixed and are not configurable and two Alarm Groups, 01 and 02, are reserved for custom event settings and are fully configurable. Selecting which of the four Alarm Groups to configure the RS-485 Annunciator is determined by the film that is placed on the front left panel. The Alarm Groups and the events that make up the films for each of the Alarm Groups are detailed below in Tables 24, 25, and 26. Configuring the RS-485 Annunciator to one of the four Alarm Groups is accomplished through