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