BMA

C54-004 & C54-005 Ground Monitor Kits

• For low-medium voltage circuits • MSHA BTS Acceptance 051983 SM-01 • No calibration needed

Introduction

4 Parts of Ground Monitors • Power Supply – derived from a 120/15 VAC constant voltage transformer with a

secondary voltage of 15 VAC + 10% over a primary voltage range of 150/80 volts AC

• Ground Loop Resistance Circuit – monitors the grounding circuit. The Ground Monitor Relay energizes if the combined pilot to ground wire resistance is less than 10 ohms and deenergizes if the combined resistance exceeds 50 ohms.

• Ground Monitor Relay – special relay that cannot be energized by alternating current. If a pilot to ground fault exists, shorting out the diode at the machine, the ground monitor relay will deenergize and trip the power circuit breaker.

• Ground Wire Sensor – monitors the level of current flowing through the ground wire. If the ground wire is broken, the Ground Sensor Relay would sense insufficient current flowing through the ground wire and trip the power circuit breaker

Service Sentinel Ground Monitors are for low-medium voltage circuits to monitor continuously the grounding circuit to assure ground wire continuity.

Switch Gear Unit

For wiring instructions see terminal connections diagram. The ground wire from cable being monitored must go through C.T. before being terminated to switchgear (A2596). Therefore, the line plug and receptacle must be isolated from the ground wire. A flexible ground strap must be connected between the plug housing and switchgear unit enclosure. It must have the same current rating as the ground conductor.

Remote Control Section

Calibration

No calibration is needed.

Note 3: For information concerning the remote control section see XXXXX. MSHA BTS Acceptance 051983 SM-01

C54-004 & C54-005 Ground Monitor Kits

Becker Mining America

PO Box 940

F (304) 733-4541 www.beckerminingamerica.com

Typical Mounting Dimensions

No unauthorized modification to Monitors

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Phone: (304) 733-7204 Fax: (304) 733-4541

Becker Mining America PO Box 940 Barboursville, WV 25504 www.beckerminingamerica.com

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