UMAX090600 Version 1
Preliminary Documentation – May be Subject to Change
8-48
parameter
Float to Bulk Transition Voltage Threshold.
If the battery voltage drops below this
threshold, the controller will then shift to
Bulk Charge
mode.
During any stage throughout the profile, the thresholds along with their respective hysteresis
values are used to determine what stage the controller should shift in order to properly charge the
battery.
For more details on the ranges of each of the setpoints mentioned in this section, please refer to
Section 4.3.
1.3.
Battery Protection & Thermistor Input
In order to prevent a battery from damage, the hardware is able to detect over-current due to
shorts that can immediately shutdown the charging of the battery. Important signals are also being
monitored by the firmware to disable charging if any of the signals are not within proper operational
range.
There are also firmware protection settings for safe operation of the battery charge. Battery
voltage, power supply voltage, internal temperature and output current are all being monitored
continuously. These can all be enabled by the user in order to halt the battery charge operation. By
default, power supply range errors are enabled so that if the power supply voltage measured falls
outside of the ranges, the battery charge operation will stop. Once the power supply voltage falls
within operating range, the controller will determine which stage along the profile to engage based
on the monitored signals. Please refer to Sections 1.6 and 4.9 for more details on Diagnostic
setpoints.
Also, for safety, battery temperature input by an optional NTC thermistor can be physically
connected to the controller or through the J1939 network and stops the charging process if the
battery temperature increases higher than a certain level.
1.4.
Dual LED State Indicator Block
The CAN-BC-LED supports a dual LED (Green and Red). The dual LED output can be used as
means to provide the user with feedback of the status of the controller.
The structure of the output block for the dual LED output is based on stages. The CAN-BC-LED
provides the user with up to six different stages in order to provide more flexibility to the dual LED
output functionality.
Each of the six stages consists of its independent control source and digital response. However, only
one stage can be active at a time. For this reason, the 6-stage structure is based on priority in which
the 6
th
stage has the lowest priority and the 1
st
stage has the highest priority. In other words: if all 6
stages are true, the response set for stage 1 will be used to drive the LED. In the instance when
none of the stages is active (ON), the Dual LED function block has another group which is the default
