November 30, 2020
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PLDC04348
REVISION 00
November 09, 2020
TECHNICAL OFFICE
D1 PRINTED CIRCUIT BOARDS
The power pcb located internally of the machine performs a number of functions: in addition to
controlling and supplying power to the centre brush, side brush, suction unit and filter shaker
motors and to the actuator, it also operates as a battery charger. Accordingly, in the event of the
battery being replaced with another of non standard specification, the type of the new battery
must be entered via the display pcb so that the charge curve can be adapted as necessary.
The motors are activated in 'soft-start' mode to avoid current peaks that could have the
undesirable effect of causing the battery charge to deplete faster than normal. The power board
delivers a maximum current of 15A and is protected by a fuse rated 20A, mounted directly to
the pcb. Another function of the pcb is to monitor the power draw of the centre and side brush
motors, thereby determining the pressure on the bristles in accordance with the setting selected
at the control panel. Program 1 or Program 2. Consequently, the current draw will be different for
each of the two settings, greater in the case of Program 2. The instantaneous power draw of the
brushes can be viewed on the display, if function UB.1 is enabled in the settings menu.
When the brushes are set in motion, the power pcb takes a reading of the current draw at the
motors before the bristles touch the floor, to determine a 'TARE' value, and thereafter, when
contact is made with the floor, the pcb will read the overall power draw and subtract the TARE
value to obtain the power draw indicating the ground pressure of the brush: the power draw
is maintained steady at the display pcb setting. Another function of the power pcb is that of
selecting automatic activation of the filter shaker, with the setting made by way of the display
pcb.
The power pcb also performs the function of detecting errors affecting the brush motors and
the charge status of the battery. Yellow Led alight: indicates that the battery voltage is lower
than 10.9V for GEL, AGM or SLA types, and 10.5V for conventional Lead Acid. Red Led alight:
indicates that the battery voltage is lower than 10.2V for GEL, AGM or SLA types, and 9.3V for
conventional Lead Acid.
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POWER CIRCUIT BOARD
Summary of Contents for NOBLES S6
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