7. UNIT OPERATION
Understanding The Charging Mechanism
Note 1: The Charger is powered by the battery connected to DC Output (CH1) and also
supplied by CH2 or CH3 if available. The display will turn o to save power when Input
Channel CH2 and CH3 are out of operating range.
Operating from a Start Battery / Alternator (CH3)
Normal Operation:
Input Battery / Source
12V Input 24V Input
Input Voltage Range 10.5V – 16.0V 21.0– 32.0V
Normal Start-Up Voltage (Note A) > 13.2V > 26.4V
Normal Under Voltage Recovery Voltage (Note A) > 12.8V > 25.6V
Ignition Start Terminal
> 10.5V forces Ch3 input to the Low
Start-Up and Low-Under Voltage
recovery settings.
Low Start-Up Voltage (using Ignition Start Terminal or
using Manual Over-ride setting) (Note B)
> 12.3V > 24.6V
Low Under Voltage Recovery Voltage (Note B) > 12.0V > 24.0V
De-Rated Voltage (with load) (Note C) 11. 5V 23.0V
Under Voltage Shutdown (with load) 10.5V 21.0V
Over Voltage Shutdown 16.0V 32.0V
Over Voltage Recovery 15.5V 31.0V
Input Battery System Reset Voltage (NoteC) < 7V < 7V
Maximum Input Current - EN3DC30 30A 30A
Note A:
When the battery is charging through CH3 with normal operation (not through Ignition
or override setting), the charger will charge for 3 minutes, it will then rest for 5 seconds to
verify the Input voltage.
During the 5 seconds rest period, if the measured voltage is > Normal Under Voltage Recovery
Voltage (> 12.8Vdc on a 12V system or > 25.6Vdc on a 24V system), the unit will continue the
charging cycle through CH3.
Or if the measured voltage is < Normal Under Voltage Recovery Voltage (< 12.8Vdc on a 12V
system or < 25.6Vdc on a 24V system), the unit will switch back to charge from CH2 (PV) until
CH3 returns to Normal Start-Up Voltage (13.2V on a 12V System and 26.4V on a 24V system).
Also, during the 3 minutes charging process, if the measured terminal voltage drops below
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