Owner`s manual

22
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 13 for a visual view. Also, if viewed from
the bottom of the printed circuit board, pin #1 is the square pin.
The +5 and GND power comes from a 100 mA current limited power supply which
should NOT be used to power any other non Manzanita Micro devices! 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. AGAIN, DO NOT
USE THE REGBUS 5V POWER TO POWER ANYTHING ELSE!
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:
1. Supply power to the charger side of regs.
2. Support analog data exchange from regs to charger and analog control of
charger by the regulators (or other BMS).
3. Support digital data transfer and control of regs via the Rudman Bus (modified
EVILbus).
Optimally, the charger will run at full current until the first battery regulator can no
longer keep up. Then the charger will cut back as necessary but continue moving
some current into the battery pack until every regulator or individual BMS cell
channel has come up to the fully charged voltage level. With new batteries, it may
first take several hours for the pack to go from the first one to top off until the last
one tops off. As the batteries become more synchronized with regular use, the time
should be greatly reduced and ideally all of the batteries top off at the same time. At
the end of a battery pack's life, the time to equalize often gets longer again.