Electrical System 31Service Manual – Focus II / Scrubtec R6 Rider Autoscrubber
Description Of The Low-Voltage Cutout Feature
The Focus machine is equipped with a low-voltage cutout feature to prevent over-discharging of the
batteries. When the machine’s battery voltage falls below the dened threshold, the scrub system is
automatically shut down to preserve battery power until the machine can be recharged. The voltage cutout
level is adjustable for different battery types, because different battery types can sustain different levels of
discharge without degradation. (Refer to the section, Low Voltage Cutout described on page 21).
Onboard Battery Chargers
An optional S.P.E battery chager or Delta_Q IC650 charger may be installed on the machine. Early
machines used the S.P.E charger and later machines use the Delta-Q charger. Early machines may also be
retrotted to accept the Delta-Q charger.
Interlock Circuit
Both types of battery chargers have an “interlock circuit” which consists of an internal relay that interrupts
power to the drive wheel speed controller when the charger is plugged into an AC power outlet. This
prevents the machine from being propelled while the batteries are charging.
S.P.E. Charging Profiles and Charging Progress
When the S.P.E. battery charger is plugged in, the graphic
display will show the charging prole in use, and a battery icon
with 0 to 5 bars to show the charging progress.
The S.P.E. battery charger and A1 Control Board communicate with one another on a wire that runs
between them. Each time the battery charger is plugged in, the charger contacts the Controller by sending
out a positive voltage on the communication wire to nd out what kind of batteries are in the machine. It
needs to know this in order to use the correct charging prole. The Controller responds and provides the
battery type information it has stored in memory. The charger then tells the Controller which charging
prole it will use and begins charging the batteries.
Refer to the Control System, Main Machine Controller Programming Options section for information
on how to tell the controller what kind of batteries are used in the machine. If the charger is unable to
communicate with the controller it will use the prole for a wet battery at a 25-amp rate as a default.
Figure 1. Delta-Q Charger
Figure 2. S.P.E. Charger
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