PM3-48V Series Brochure

Copyright© 2011, Fieldstone Products Inc. Fieldstone Products Inc. reserves the right to make changes in the product at any time,
without notification. Install Guide PM18-48-3 19 October 2015
TROUBLESHOOTING
NOTE: Before removing and replacing the Converter/charger, perform the following checks:
a. Disconnect the AC power from the vehicle/device.
b. Disconnect the wiring and Battery from the Converter Positive + output terminal.
c. Re-connect the AC power to energize the Converter.
d. Using a voltmeter, measure the voltage at the Converter – and + Output terminals.
> The Converter/Charger is OK if the voltage reading is between 54 VDC and 55 VDC (typically 54.4 VDC).
> Otherwise check the table below:
CONDITION POSSIBLE CAUSE
No 48 VDC output
• 120 VAC not connected to coach or the coach AC circuit breaker is in the off position.
• Reversed battery fuses blown. (Battery wiring connections are reversed),
• Severe overload or shorted load. Remove all loads and retest per above instructions.
• Converter/Charger internal failure.
Converter cycles On & Off
• Fan air flow is inadequate or blocked. (1” minimum free air space at each end required)
• Converter/Charger internal failure.
Reversed Battery fuses blown
• Battery wiring connections are reversed.
• Defective battery, possible bad cells.
48 VDC output is too low
• Attached load exceeds rating of the Converter/Charger.
• Defective battery, possible bad cells.
• Converter/Charger internal failure.
Fieldstone Products PMB 103 • 11161 E SR 70 STE 110 • Lakewood Ranch, FL 34202
Phone: [phone] • Fax: [phone]
www.powermaxconverters.com
‘Reversed-Battery’ Fuses
Chassis Bonding Lug
48 VDC Output Terminals
AIR FLOW FAN
(on back-side)
.
.
.
.
Blows air out of
front grill vents.