2 — INSTALLATION AND WIRING
Curtis Model 1226 – September 2019
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pg. 22
Battery Discharge Indicator (BDI)
e 1226 controller can drive a 0V-5V BDI panel meter that displays the battery’s state-of-charge.
e battery must be put through a full charge cycle with the controller installed before the BDI will
begin operation.
If the vehicle system uses a BDI, connect the BDI to the BDI Output pin (J3-5).
Note: For information on conguring the controller’s BDI output, see BDI Setup Menu on page 41
and Calibrating the Battery Discharge Indicator (BDI) Output on page 71.
Charger Inhibit
e controller’s charger inhibit function prevents driving while the vehicle is being charged.
To congure charger inhibit for your vehicle system, you must connect one of the following charger
terminals to pin J3-15:
• If the charger has a dedicated third terminal that automatically provides charger inhibit,
connect that terminal to pin J3-15.
• Otherwise, connect the charger’s B- to pin J3-15.
For an example, see Figure 6.
Circuitry Protection Devices
To protect against accidental shorts, the following fuses are recommended:
• A low current fuse, appropriately sized for the maximum control circuit current draw,
should be connected in series with the B+ logic supply. See the control fuse in Figure 6.
• A power fuse, appropriately sized for the controller’s maximum rated current, should be
connected in series from the battery to the controller’s B+ terminal. is fuse will protect
the power system from external shorts.
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