Unipower ARE-M02406 Product Manual page 59

Micro ARE-M Series 24V Chargers, Single Phase
Symptom
F. Excessive output current.
G. Excessive electrical noise or
ripple.
H. Oscillations or poor regulation.
I. Low output current.
Check with portable meter.
J. Acoustic noise.
K. No 2-line digital display or
keypad activity. DC output OK.
L. Configuration (setup) not saved.
Possible Cause(s)
No current limit.
1. Loose filter connections.
2. Open filter capacitor.
3. Open power diode.
4. DC cable routing (excessive noise).
5. Improperly sized battery.
6. Preload resistors ON with unit OFF.
1. Loose connection.
2. Defective triac.
3. Component failure in Control and
Display board.
4. Open power diode.
5. Resonant capacitor not grounded.
1. Loose connection.
2. Open power diode.
3. Unit in current limit.
1. Loose laminations.
2. Cabinet vibration.
1. Control and Display board
2. Interface board
3. Ribbon cable
Control Board
6-5
Solution(s)
a. Current limit control improperly
set.
b. Component failure in Control or
Interface board. Replace.
c. Check connections from shunt
to interface board.
Check wiring and bus bars for loose
or corroded connections.
Check filter capacitors.
Check power diodes.
Check broken cable ties.
Check battery rating.
Replace Interface board.
Inspect circuit boards, connectors, and
wiring for loose contacts.
Replace triac.
Replace Control and Display board.
Check power diodes. Replace as
required.
Check AC capacitor case to ground
with ohmmeter.
Inspect wiring.
Check power charger diodes. Replace
as required.
a. Current limit control improperly
set.
b. Defective Control and Display
board. Replace.
Check air gap areas of power
transformer and control reactor with
insulated screwdriver.
Check welds and bolted joints.
Replace part
Replace part
Replace part
Replace part
PM990-1070-24, Issue 12
Maintenance