FORM NO. 56043056 ConvertaMAX™ 20/26 / BA 550/650 - 49
ELECTRICAL SYSTEM
FRONT
TOP OF
MACHINE
LED Indicator Light
Pushbutton
Switch
A1 Timer Module
Assembly
DESCRIPTION OF THE BATTERY LOW VOLTAGE CUTOUT FEATURE
The ConvertaMAX™ 20 & 26 / BA 550 & 650 are equipped with a low voltage cutout feature to prevent over-discharging of the batteries. When
a machines battery pack voltage falls below specifically defined thresholds (voltage settings) the scrub system is automatically shut down. The
cutout level is adjustable. The standard lead acid battery (wet cell) setting is 21 volts (1.75V per cell) and alternate maintenance free battery (gel
cell) setting is 22 volts (1.83V per cell). The standard setting is factory selected and should be used unless the battery manufacturer specifies the
higher cutout voltage. Special Service Note: On all the 24V and 36V machines a minimum recharge voltage of 2.09 volts per cell must be reached
to allow the scrub brush and solution systems (to reset) function again. A 24V-battery pack must increase to a 25.1-volt minimum and a 36V battery
pack to 37.6 volts.
LOW VOLTAGE CUTOUT LEVEL SELECTION
See Figure 2. Have a qualified service technician perform this selection. The cutout level is selected by momentarily depressing the pushbutton
switch located on the module circuit board. Observe the LED indicator light on the circuit board(*), which gives the following indications:
Light OFF
No battery power, key is off, or module not functioning
Light ON Slow Flash
Alternate maintenance free battery voltage threshold selected (22 volt setting)
Light ON Fast Flash
Standard lead acid battery voltage threshold selected (21 volt setting)
Light On Continuous
Module is in low voltage cutout mode(**)
*Remove the operator instrument panel to access the LED voltage selection indicator light.
**Scrub brush motor will not operate until batteries are recharged.
Special Battery System Note: It is important to know that the electronic controller module is not connected to the Curtis Battery Fuel Gauge (12).
Therefore, the fuel gauge may or may not be flashing when the module inhibits (shuts down) the brush motor operation depending on the low voltage
cutout threshold selected.
DESCRIPTION OF THE BATTERY FUEL GAUGE
The Battery Fuel Gauge (12) uses a 10 bar LED display that indicates the state of the batteries charge, successively, bar by bar, from full to empty.
At 70% depth of discharge a single flashing light signals an energy reserve alert. At 80% of discharge, a double flashing light signals an empty
alarm. The battery gauge will retain the last state-of-charge condition even when the machine has been turned off. The battery fuel gauge state-
of-charge display indication is automatically reset to full charge when the battery pack is recharged.
FIGURE 2
revised 7/02
