SHEET AS 5271421 - Caterpillar

Illustration 1 g00710264
Optional Relay Driver Module And Relay BoardThe Relay Driver Module (RDM) is an optional module. The RDM will increase the number of available outputs on the PRCM. Each RDM provides nine additional outputs. The outputs of the RDM are individually controlled by a serial data link from the PRCM. The outputs may drive the optional relay board. The outputs can be directly connected to horns, lamps, or other devices. The relay board contains nine relays. Each relay has a set of normally open contacts and each relay has a set of normally closed contacts. These relays are distinct from the seven relays that are contained within the PRCM Relay Module. These relays are in addition to the seven relays that are contained within the PRCM Relay Module. These relays are located on the rear of the PRCM. Once the output of the RDM is activated, the RDM will remain energized. The output will remain energized until the condition is cleared. The PRCM has two separate serial data links that enable the PRCM to be connected to two RDM'S.
Illustration 2 g00710266
Output Test
The RDM will activate all outputs for ten seconds after the RDM receives an output signal. The RDM will activate for ten seconds unless the signal is deactivated. The test of the output signal is activated by connecting terminal 5 of the RDM to terminal 7 of the RDM. Data Link
When the data link malfunctions, R1 output (terminal 2 of RDM) will be activated on and off at a rate of 0.5 Hz. Relays R2 through R9 will maintain the current status. Relays R2 through R9 could default to the OFF position. This is controlled by a jumper between terminal 6 and terminal 7 of the RDM. If the serial data link has a fault and a jumper is NOT present, the relay outputs (R2 through R9) will maintain the current status. If the jumper is present, R2 through R9 will default to the OFF position. Specifications
The maximum length of wire between the RDM and the PRCM 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 PRCM and the relay board.
The terminals that are on the RDM are push on blade connectors. The connectors are 6.4 mm (0.25 inch).
The screw terminals on the