Owner`s manual

Reg Bus Wiring
The Reg Bus Interface:
The REG BUS communicates to the charger when any BMS regulators are
regulating and also if any regs are too hot. The charger uses this information to
determine when to turn down the charge current and when to turn off the charger.
The interface contains six wires connected with their respective pins as follows:
1. WHITE : Power supply (+5 volt DC)
2. BLACK : Reg over voltage condition (reg ON or reg hot) +5V will activate this
line and tell the charger to stop charging
3. RED : Under voltage condition – 0V on this line means under voltage active
4. GREEN : Power supply return (GND) – Refers to charger’s Batt Neg line
CAUTION: The GND return is NOT isolated on older charger models!
5. YELLOW : Rudman bus negative
6. BLUE : Rudman bus positive
Note: On the PFC Chargers the RJ plug is upside down so the pin count reads from
right to left as if backwards. Refer to figure 11 for a visual view. Also, when viewed
from the bottom of the printed circuit board, pin #1 is the square pin.
The optic components keep the local Batt POS and Batt NEG (battery or cell being
monitored) isolated from the charger’s Batt POS and Batt NEG. The +5 and GND
are powered from a 500 mA current limited power supply. All measurements are
made relative to the GND wire. It is important to verify all six of the wires are
continuous throughout the system and pin-to-pin.
NOTICE! On older models the Ground (GND) on the reg bus is also battery
negative on a PFC charger!
The primary functions of the REG BUS are:
9. Supply power to the charger side of regs.
10.Support analog data exchange from regs to charger and analog control of
charger by the regulators (or other BMS).
11.Support digital data transfer and control of regs via the Rudman Bus (modified
EVILbus).
Optimally, the charger will run full current until the first regulator gets hot, then cut
back to save that regulator and then watch for the last one to come up to
temperature to indicate that all the batteries are fully charged. With new sets of
batteries, it can take several hours for the pack to go from the first one to top off
until the last one tops off. As the batteries age and become synchronized, the time
is reduced to less than an hour. At the end of pack life, the time gets longer if the
batteries failure mode is self-discharge.
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