GASKET-CYLINDER HEAD (1.60MM THK) 7W9955 - Caterpillar

Illustration 1 g00327305
(1) Relay driver module (2) Relay board (optional)The relay driver module (RDM) is an optional module that can be used to expand the number of available outputs on the GSC+. The RDM outputs are controlled by the customer communication module (CCM). The RDM provides nine additional outputs for the customer. The RDM outputs are individually controlled by a serial data link from the GSC+. The outputs may drive the optional relay board, or the outputs can be directly connected to horns, lamps, or other devices. The relay board contains nine relays. Each of the relays have one set of Normally Opened contacts and one set of Normally Closed contacts that are used for customers.Output TestIf an output test signal is received by the RDM, then the RDM activates all outputs for ten seconds. The outputs remain active until the output test signal is deactivated. To perform an output test, connect terminal 5 of the RDM to terminal 7 of the RDM with a jumper.When the data link malfunctions, R1 output (terminal 2 of RDM) will FLASH at a rate of 0.5 Hz. Relays R2 through R9 will maintain the present state or relays R2 through R9 will default to the OFF position.Specifications
The maximum distance between the RDM and the GSC+ is 305 m (1000 ft).
The operating voltage range is from 15 to 45 DCV. The RDM is designed to operate when the RDM is powered by 24 DCV or when the RDM is powered by 32 DCV.
The RDM is capable of operating with an earth ground or without an earth ground.
The RDM must share a common ground with the GSC+ and the relay board.
The terminals that are on the RDM are push on blade type connectors (6.4 mm (.25 inch)).
The terminals on the relay board are 6-32 screw terminals.
The driver outputs of the RDM are intended to power incandescent lamps. Also, the driver outputs of the RDM are intended to power relay loads. The driver outputs sink up to 600 mA at 15 DCV to 45 DCV. The driver outputs are protected against short circuits to "B+".
The relay outputs of the relay board are protected by 1 amp fuses. The contacts are flashed with silver. The contact is rated as 1 Amp at 28 DCV. The relay coils draw 20 mA at 24 DCV.Note: The GSC+ diagnoses a fault in the Relay Driver Module circuit. See Testing and Adjusting, "CID 475 Relay Driver Module" for more information. The CID 475 procedure contains schematics for relay driver module installation purposes.