Micro
ARE-M Series 24V Chargers, Single Phase
Maintenance
PM990-1070-24, Issue 12
6-2
3.
Check that all connections are clean and tight. Discoloration of terminals or wires is an indication of loose
or corroded connections.
4.
Check capacitors (both AC and DC) for leakage, case or seal rupture, etc. All screw connections should be
checked and tightened as needed. DC capacitors over five years old or showing signs of degradation should
be removed and checked for excessive leakage and/or replaced.
5.
Check the float voltage, equalize voltage, and other configurable settings, using the front panel controls. See
Chapter 4 Setup and Operation.
TROUBLESHOOTING
6.3
Table 6-1 is a troubleshooting chart designed to help a qualified technician diagnose the cause of a charger
malfunction. While troubleshooting, refer to the cabinet assembly drawing and the schematic diagram for the
charger model at hand. These aids can be found in this chapter. Also provided is a section describing the testing
of various electrical components.
For efficient troubleshooting, gather as much information as possible about the malfunction.
1.
Read the front panel display and note charger output voltage and current
2.
Note whether the front panel On/Off and Alarm LEDs are lighted
3.
Note whether the AC or DC breaker trips
4.
Measure the AC source voltage
5.
Check AC, DC, and alarm wiring
6.
Check configurable parameter values to be sure an unintended setup change is not interfering with
equipment operation
7.
Note environmental conditions before and at the time of the malfunction (e.g. excessive ambient
temperature, water intrusion, excessive foreign material accumulated on heat sensitive components)
8.
Review the equipment’s service history
After gathering data concerning the malfunction, scan the symptoms in the left column of the Troubleshooting
Chart, Table 6-1. When the observed symptom is located, read across the table for a possible cause and solution.
The circuits and functions on the Control and Display board and the Interface board are highly integrated
making it difficult to isolate a problem to one of these boards. Board replacement is recommended to repair a
control or display related problem.
6.3.1 Service Access
For access to the Interface board, Control and Display board, AC and DC circuit breakers, and connection
terminal blocks, loosen two captive screws and open the hinged front panel.
To replace a component inside the charger, such as the transformer or a filter capacitor, remove the top cover.
Additional access is provided on 12" cabinets by removing the interface board panel.
6.3.2 Circuit Board Handling
Semiconductors such as ICs (integrated circuits), diodes, and transistors must be protected against damaging
electrostatic discharge. A properly grounded wrist strap must be worn whenever a circuit board is handled or
touched. A service kit with a wrist strap and static dissipative work mat is available from both mail order and
local electronic supply companies.
