Hardware Manual
BMS Master 4 / 4.5
Ref.: IR14417 A 15.01.2018 Page 40/76
3.4.4.11 LONG TIME WATCHDOG
On the Slave PCB a slow RC-generator (approximately 3 Hz) clocks a multistage divider IC
that has to be reset periodically by the MASTER. If no reset happens, e.g. caused by an
unsupplied MASTER, the divider IC cuts off all balancing circuitry to prevent totally
discharging of the battery.
The time-out will appear app. 40 minutes after the last reset.
3.4.4.12 INTERFACE ISOLATION
The interfaces to MASTER, RS485- and FAIL-interface, are optically isolated with air and
creepage distances of ≥ 10 mm, sufficient for voltages up to 1000 VDC at pollution level 1.
ATTENTION: The mounting holes do NOT comply with the
requirements of 10 mm air and creepage distances for high voltages.
If the slave modules are used under these conditions
non-conductive screws and/or bolts must be used.
3.4.5. MECHANICAL DIMENSIONS
PCB size 75 x 91.5 mm;
four mounting holes for screws M3,
o symmetrically arranged one on each corner, distances 67 x 83,5 mm
mounting height on top ≤ 14 mm including connectors.
mounting height on bottom ≤ 7 mm including connectors.
mounting height with no connectors (cables soldered directly) ≤ 4 mm on top and
bottom.
3.4.6. POWER SUPPLY AND CONSUMPTION
Operating voltage: 5.4 to 12.6V (by 3 cells of controlled battery)
Current consumption:
Average current consumption with BMS-master active, no bypass active ≤ 10 mA
Peak current consumption while transmitting data to master unit ≤ 20 mA
Standby/sleep with BMS-MASTER inactive ≤ 0.01 mA
Bypass current per cell with no external bypass resistor (voltage dependent) 50 ... 62
mA
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