Micro
ARE-M Series 24V Chargers, Single Phase
Maintenance
PM990-1070-24, Issue 12
6-19
INTERFACE BOARD
6.8
This section provides Interface Board troubleshooting and replacement information. The Interface Board can be
replaced in the field. There are no user-serviceable parts on the board. The board is shown in Figure 6-11. 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.
The board is available in a number of versions. A Standard Board (A1), an optional Multiple Alarm Board (A1
OPT), and a switchable ground detection is available. (A Standard Board has 3 alarm outputs while the optional
Multiple Alarm Board has 9 alarm outputs.) To order a replacement board, refer to Table 6-2 Parts Lists for the
Interface Board part number for the charger model at hand.
6.8.1
Board Interchangeability
The Interface Board part number suffix (e.g. 306-3078-24) specifies the compatible charger DC output voltage,
24V in the preceding example. Suffix letters indicate options like multiple alarm relays or switchable ground
detection. Install the board in any charger rated for that output voltage, regardless of current output rating.
When replacing an Interface Board, set the miniature rotary switch SW1 to the current rating of the charger into
which the board will be installed. See Table 6-3.
IMPORTANT:
DO NOT change the setting of SW2. It is factory set. If inadvertently changed, set SW2 to the
board part number suffix at the “position” shown in Table 6-3. SW2 may not be on all boards.
TABLE 6-3 INTERFACE BOARD SWITCH SETTINGS
SW1
SW2
Position
Function
Position
Function
0
30 Amperes
0
Not Valid
1
3 Amperes
1
12 Volts
2
6 Amperes
2
24 Volts
3
12 Amperes
3
48 Volts
4
16 Amperes
4
130 Volts
5
25 Amperes
5
260 Volts
6
35 Amperes
6
Not Valid
7
50 Amperes
7
Not Valid
8
75 Amperes
8
Not Valid
9
100 Amperes
9
Not Valid
