REC ACTIVE BMS 4S
14
www.rec-bms.com
System Error Indication:
System errors are indicated with
red
error LED by the number of ON blinks, followed by a longer OFF state.
Table 7:
BMS error states.
Number of
ON blinks
ERROR
BMS
OWNER
1
Single or multiple cell
voltage is too high
(cell over voltage
switch-off).
BMS will try to balance down the
problematic cell/cells to safe voltage
level (10 s error hyst single cell
voltage hysteresis is applied).
Charging is disabled, discharging is
enabled. Charge optocoupler is disabled,
discharge optocoupler is enabled.
Wait until the BMS does its job.
2
Single or multiple cell
voltage is too low
(cell under voltage
protection switch-
off).
BMS will try to charge the battery
(10 s error hyst single cell voltage
hysteresis is applied).
Charging is enabled, discharging is
disabled.Charge optocoupler is enabled,
discharge optocoupler is disabled.
Plug in the charger.
3
Cell voltages differs
more than set.
BMS will try to balance the cells
(5 s error hyst 20 mV voltage
difference hysteresis).
Charging is enabled, discharging is
enabled. Charge optocoupler is enabled,
discharge optocoupler is enabled.
Wait until the BMS does its job. If
the BMS is not able to balance
the difference in a few hours,
contact the service.
4
Cell temperature is
too high (over
temperature switch-
off).
Cells temperature or cell inter-
connecting cable temperature in the
battery pack is/are too high. (10 s error
hysteresis 2°C hysteresis).
Charging is disabled, discharging is
disabled. Charge optocoupler is disabled,
discharge optocoupler is disabled.
Wait until the pack cools down.
5
BMS temperature is
too high –internal
error (BMS over
temperature switch-
off).
Due to extensive cell balancing the BMS
temperature rose over upper limit (5 s
error hyst 5 °C temperature
hysteresis).
Charging is disabled, discharging is
disabled. Charge optocoupler is disabled,
discharge optocoupler is disabled.
Wait until the BMS cools down.
6
Number of cells,
address is not set
properly.
