Key facts
- Manuals
- 1
- Languages
- EN
- Last added
- 2026-11-05
Featured AMR manuals
AMR Ground Check System GM-300 Installation and Maintenance Manual
This manual provides step-by-step instructions for installing, operating, testing, and troubleshooting the AMR GM-300 Ground Check System. It covers component assembly, wiring, sensitivity adjustment, and fault diagnosis. The system monitors pilot and ground wire loop resistance and includes optional trip indicators and batteries for enhanced functionality. All field repairs are possible down to the board level, with replacement parts listed in Appendix B.
Covers: Introduction · Operation · Test Switch · Sensitivity · General Information · Optional Trip Indicator
Latest AMR manuals
AMR Ground Check System GM-300 Installation and Maintenance Manual
Service Manual 17 pages · 184 KB · ENInstallation, operation, testing, and troubleshooting guide for the AMR GM-300 Ground Check System used in electrical systems.
Which document do I need?
Service Manual
Disassembly, diagnostics and part numbers, for repair.
Questions answered in AMR manuals
How do I test the GM-300?
Press the test push-button. As the normally closed contact breaks, the GM-300 will detect an open circuit, one PLUS LIGHT goes out, and the “HIGH” ohms light will blink; then the normally open contact will make and a 9 ohms test resistor will be connected in the circuit.
From: AMR Ground Check System GM-300 Installation and Maintenance Manual
What does the GM-300 monitor?
The GM-300 senses the external resistance between its ground and pilot terminals, including the resistance of the pilot wire, ground wire, and any other resistance in the electrical path.
From: AMR Ground Check System GM-300 Installation and Maintenance Manual