Micro
ARE-M Series 24V Chargers, Single Phase
Maintenance
PM990-1070-24, Issue 12
6-20
6.8.2
Troubleshooting
1.
If the charger is not working properly, there are test points on the Interface Board that can help locate the
problem. TP1 is board common and is used for all other test point voltage measurements. TP2, TP3, and
TP4 are the DC-DC power supply outputs. All voltages must be within tolerance for the board to work
properly. The board should be replaced is a voltage is incorrect.
TP1 to TP2 should read +12
0.5Vdc.
TP1 to TP3 should read -12
0.5Vdc.
TP1 to TP4 should read +5
0.25Vdc.
2.
If the power supply is working correctly the following test points can be measured.
TP1 to TP6 should read between 0 and 3-4 volts depending on charger load.
0V = no load
3-4V = rated output of charger
TP1 to TP7 depends upon the output voltage of the charger.
48V charger: approximately 1.2V
TP1 to TP8 should be about the same as TP1 to TP7 (assuming the DC breaker is closed).
TP1 to TP9 should be about 2V if there is no ground short.
TP1 to TP10 should be about –5V if there is no load share.
3.
Check the settings of rotary switches SW1 and SW2.
SW1 is set for the DC current output rating of the charger.
SW2 is set for the DC voltage output rating of the charger. (SW2 may not be on all boards)
After the switches are changed, the control must be reset by disconnecting and reconnecting the ribbon cable.
(See sections 6.8.1 and 6.9)
6.8.3
Replacing the Interface Board
Use caution when servicing or replacing the board since battery voltage is present on the board whenever the
battery string is connected to the charger.
1.
Refer to Chapter 4 Setup and Operation and turn off the charger.
2.
Loosen the two quarter-turn captive fasteners and open the front panel.
3.
At TB1, label each of the removable plugs with the alarm name printed on the circuit board. Pull each plug
up and out of its mating connector.
4.
Disconnect the battery temperature sensor from terminal block J2, if present.
5.
Disconnect the cabled connectors from the board.
6.
Remove the screws securing the board and remove the board. Note the settings of switches SW1 and SW2.
7.
On the replacement board, check the settings of SW1 and SW2. See Table 6-5 for proper settings.
8.
Fasten the board to the charger using the screws removed above.
9.
Install the cabled connectors, alarm plugs, and battery temperature wiring.
10.
Turn on the charger and test its operation and setup.
