English 5.906-434.0 Rev. 00 (12/10)
17
The printed circuit board allows the safe and reliable
operation of the battery-powered BR 30/4 via voltage
and current measurement.
Battery test
There are two different switch-on criteria.
A After every switch-on, both batteries are checked.
The depleted battery is always activated, unless
its idle voltage is at least 20.5 Volts. A completely
discharged battery is indicated by a red LED im-
mediately and continuously.
If both batteries are below this minimum threshold,
the appliance cannot be started.
B During the discharge, the active batteries are
measured permanently and switched off accord-
ingly to prevent a depth discharge.
Over current switchoff
After switching on the BR 30/4, the electric motor will
start via a startup ramp. This will last approx. 3.8 sec-
onds. This way, startup currents that are too high are
prevented. With currents >45 A, the motor will be
switched off. The switch-off is displayed via the two
LED operating status displays. The blink orange. If
the appliance is not shut off, the display will remain
the same until the batteries have been discharged to
20 Volts. In this case, the display changes to red con-
tinuous light. After 30 seconds, the control will shut off
automatically.
Relay test
When switching on, switching off, or switching from
one battery to another, the printed circuit board is
checked for sticky relays. If a relay sticks, the appli-
ance cannot be started up. The printed circuit board
will give out an error message, both LED operating
status displays blink simultaneously with the colours
red and orange. The blinking of the LED operating
status displays can only be terminated by removing
the batteries.
Exception:
A sticky relay during switch on. Here, the display will
only show up while the ON switch is pressed.
By checking the relays, the switch must be pressed
for 300 ms when turning the appliance on in order to
be able to start operating it. A short tapping will not
suffice.
1 Balance weight, brass disc
2 Wheel, right
The brass disc is installed into the right wheel (viewed
from behind) as a balance weight.
This balance weight is necessary to prevent the ap-
pliance from tipping forward due to the heavy batter-
ies. It als also prevents the brush roller from being
pressed onto the ground in the parking position.
4.5.10Control board (BR 30/4 C Bp Pack only)
4.5.11Balance weight (BR 30/4 C Bp Pack only)
