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
48 VDC Wiring– It is important to use the correct wire gauge. Use a minimum of 16 AWG size copper wire.
• The terminal marked + or POS is for the vehicle/device 48 VDC positive connection.
• The terminal marked – or NEG is for the vehicle/device 48 VDC negative connection.
• The 48 VDC output wiring does not require over-current protection because the Converter/ Charger limits current output.
However, all electrical connections need to comply with the appropriate NEC code.
6. 3 STAGE CHARGING OPTION DESCRIPTION. This system provides an automatic charging system in three steps. 1. A fast
charge to bring a good, drained battery back up to full voltage rapidly ("Boost"). 2. A standard charge to bring the battery up to a
full charge at a safe rate to prolong the life of the battery and provide power to other 48V on-board devices ("Normal"). 3. A
trickle charge to keep the battery fresh during times of load inactivity ("Storage"). The charger automatically changes modes to
accommodate changes in conditions. The chart below is for reference only, voltages may vary slightly.
7. TEST. First, disconnect all loads and battery on the Converter/Charger by removing all 48 VDC connections from + or POS .
Second, attach a multimeter instrument between the positive and negative terminals of the Converter/Charger. Then energize
the 120 VAC Converter/Charger circuit. Test for proper output power using the multimeter. Measure the output voltage from the
positive and negative terminals. The voltage should read 54.4 +/- 0.1 VDC. Add 48 VDC load connections to draw about 12
Amps from the Converter/Charger. Recheck the voltage, which should remain approximately the same as at no load.
8. BATTERY. With the 120 VAC disconnected, reconnect the + or POS positive terminal to a known good battery. With the
converter 120 VAC energized, measure the voltage at the converter and at the battery. The voltage should be about the same
in both locations. As with any battery it is important that the fluid level be checked on a regular basis. When continuously
connected to any charging source all batteries will “Gas” and lose some fluid.
WARNING – Avoid Personal Injury / Product Damage
9. HI-POT TESTING. (Vehicle/device Manufacturing Facilities Only) DO NOT Hi-Pot DC wiring with the Converter/Charger
connected to the vehicle/device wiring in order to prevent serious injury and/or damage.