RELAY AS 2970760 - Caterpillar

General Hazard Information
To prevent injury or death, all machines equipped with a Caterpillar PL522 or 523 system require a warning label that is clearly posted in the cab.
This machine is equipped with a Caterpillar Product Link communication device. When electric detonators are used, this communication device should be deactivated within 12 m (40 ft) of a blast site, or within the distance mandated under applicable legal requirements. Failure to do so could cause interference with blasting operations and result in serious injury or death.
To prevent possible personal injury during installation, removal, testing, and adjustment of the Product Link system, use an approved access system and appropriate fall protection to reach the intended location. Do not climb on the machine.
The blast site is defined as the area that handles explosive material during loading. This includes the perimeter that is formed by the loaded blast holes. If the machine is required to work within 12 m (40 ft) of a blast area, then the operator must take one of the following precautions:
Disconnect the PL522 or 523 module from the power source by disconnecting the wiring harness at the PL522 or 523 module.
Temporarily remove the PL522 or 523 module from the machine.
Add an ON/OFF switch in order to allow the PL522 or 523 module to be turned off from the cab.Consult your Caterpillar Dealer if there are any questions.The following PL522 and 523 specifications are provided to aid in conducting hazard assessments and ensuring compliance with all local regulations.Product Link Transmitter Power - 0.747 to 1.738 Watts (varies with frequency)Transmit Frequency Range - 824 to 849 MHz, 880 to 915 MHz, 1710 to 1785 MHz, 1850 to 1910 MHzGeneral Troubleshooting Information
Many Caterpillar machines have a published Electrical System Schematic that reflects a Product Link installation. Refer to these schematics if a troubleshooting procedure instructs you to "Repair the harness". Perform continuity checks and resistance checks at the connectors in order to locate a failure in the harness. At a component connector, always check the ground circuit. Less than 5 ohms of resistance is required from the ground contacts to frame ground. A problem may be incorrectly diagnosed, if an excessive resistance that is greater than 5 ohms is present in the ground circuit. During a troubleshooting procedure, inspect all component and harness connections before a component is replaced. If these connections are not clean and tight, the connection may cause an electrical problem.The problem can be permanent or the problem may be intermittent. Ensure that the wires are pushed into the connectors completely. Make sure that the connections are tight before other tests are performed. A failure of an electrical component may cause a failure of another component or a failure may be caused by the failure of other components. Always attempt to find a failure. The following test procedures are written for a technician with a working knowledge of electricity and electronics. Correct the cause of a failure in the electrical system before you replace a component.The test procedures that