PM3-12V LK Series Manual

‘Reversed-Battery’ Fuses
LED
Chassis Bonding Lug
12 VDC Output Terminals
TROUBLESHOOTING
AIR FLOW FAN
(on back-side)
.
.
.
.
Blows air out of
front grill vents.
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
c.
Re-connect the AC power to energize the Converter.
output terminal.
d.
Using a voltmeter, measure the voltage at the Converter and Output terminals.
> The Converter is OK if the voltage reading is between 13 VDC and 14 VDC (typically 13.6 VDC).
> Otherwise check the table below:
CONDITION POSSIBLE CAUSE
.
120 VAC not connected to coach or the coach AC circuit breaker is in the off position.
No 12 VDC output
.
.
.
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.
12 VDC output is too low
.
.
Attached load exceeds rating of the Converter/Charger.
Defective battery, possible bad cells.
.
Converter/Charger internal failure.
+
– +
POS
11. TEST. First, disconnect all loads and battery on the Converter/Charger by removing all 12 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
circuit. Test for proper output power using the multimeter. Measure the output voltage from the positive and negative terminals. The voltage
should read
14.6 +/- 0.2 VDC . Add 12 VDC load connections to about 2/3 of the rated capacity of the converter. Recheck the voltage, which
should remai
n approximately the same as at no load.
12. BATTERY. With the 120 VAC disconnected, reconnect the + or 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.
13.
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.
WARNING – Avoid Personal Injury / Product Damage