Kisae DMT1230 - Unit Operation and Charging Mechanism; Unit ON;OFF Switch; Charging Mechanism; Alternator;Start Battery Operation (CH3)

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6. UNIT OPERATION
Unit ON/OFF
A Unit ON/OFF switch is located at the DC Input/Output panel of the unit. Switch to ON position to
activate the charger and switch to OFF position to turn off the unit when not in used.
Understanding the Charging Mechanism
The Charger is powered by the battery connected to House Battery (CH1) and will also be
supplied by CH2 or CH3 if available. The display will turn off to save power when the two Input
channels CH2 and CH3 are out of operating range.
Operating from an Alternator/Start Battery (CH3)
Normal Operation
Input Alternator/ Start 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 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
21V
Over Voltage Shutdown
16.0V
32V
Over Voltage Recovery
15.5V
31V
Input Battery System Reset Voltage (Note C)
< 7V
< 7V
Maximum Input Current DMT1230
DMT1230: 30A
DMT1250: 50A
DMT1230: 30A
DMT1250: 50A
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.
If the measured voltage on CH3 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 the Under
Voltage de-rate voltage (11.5V for a 12V system, 23V for a 24V system), the charger will start to de-rated
the output current. This function is used to compensate for the use of long or thin wire between the Input
Battery System and the unit terminals. If the input voltage continues to drop below the Under-Voltage
Shutdown Voltage (10.5V for a 12V system and 21V for a 24V system), the charging process will terminate
and the unit will switch back to charge from CH2 (PV). It will only switch back to CH3 if the CH3 voltage
returns to 13.2V on a 12V system or 26.4V on a 24V system.
Note B:
When the unit has activated the battery charging process using the Ignition Start terminal or using the
Manual Override through the unit setting, the input voltage specification is reduced. It has the same
charging process but with the Low Start-Up Voltage set to > 12.3V (from 13.2V) on a 12V system and >
24.6V (from 26.4V) on a 24V system. This feature is designed to be used for vehicles fitted with “Smart
Alternators”.
If the measured voltage on CH3 is <12.0 Vdc (<24Vdc on a 24V system), the unit will disconnect from the
vehicle source and switch back to charge from CH2 (solar if installed) until the CH3 voltage returns to
>12.3Vdc on a 12V System (>24.6V on a 24V system).
The Low Under Voltage Recovery Voltage is set to > 12V (from 12.8V) on a 12V system and > 24V (from
26.4V) on a 24V system. During the 5 second rest period, if the input voltage returns above 12V/24V, it will
continue the charging process and if the input voltage does not return to > 12V/24V, it will switch back to
charge from the Solar - CH2 (if connected) until the Start - CH3 input has returned to the Low Start-Up
voltage of 12.3V on a 12V system and 24.6V on a 24V system.
Note C:
During the 3 minutes charging process, if the measured terminal voltage drops to below the Under Voltage
de-rated limit (11.5V for a 12V system, 23V for a 24V system), the charger will start to de-rate the charger
current. This function is used to compensate for the use of long or thin cable between the Input Battery
System and the unit terminals. If the voltage continues to drop to below the Under-Voltage Shutdown limit
of (10.5V for a 12V system and 21V for a 24V system), the charging process will terminate and the unit will
switch back to charge from CH2 (Solar if installed). It will only switch back to CH3 if the CH3 voltage
returns to 13.2V on a 12V system and 26.4V on a 24V system.