Page 100
©
2014 Magnum Energy, Inc
.
Using a PT Controller: Setup
Set Max Charge Amps
– Sets the maximum charge amperage allowed to charge the
batteries during the CC/CV charge stage. The range of settings (20-990 ADC) are provided
to limit the charge current to the battery bank, which helps prevent battery overheating
caused by charging at too high a charge rate.
Default:
200 ADC
Range:
OFF
,
20 - 990 ADC
Info:
If the BMK (Battery Monitor Kit) is connected, the DC amps value determined by
the BMK (under
METER: 05D DC Amps-BMK
) will be used by the
Set
Max Charge Amps
setting instead of the PT controller’s current (shown under
METER: 07E Bat Amps-PT
)—
as it is more accurate (+/- .1 ADC).
Set CV Charge Volts
– Sets the voltage level at which the charger will hold the batter-
ies during the Constant Voltage stage.
Default:
13.8 VDC (12v), 27.6 VDC (24v), 55.2 VDC (48v)
Range:
12.0-16.6 VDC (12v), 24.0-33.2 VDC (24v), 48.0-66.4 VDC (48v)
¤ Set
CV Chg Done
–
These selections determine when the Constant Voltage stage of
charging (displayed as “
Absorb Charging
”) is
fi
nished. If using the
Hold CV Chg VDC
setting,
the battery voltage is held at the
Set CV Charge Volts
setting. If using the
CV Chg Done
Time
or
CV Chg Done Amps
selections, once the Constant Voltage charge stage is
fi
nished,
it transitions to a Silent charge stage (displayed as “
Float Charging
”). After entering the Si-
lent charge stage, the charger automatically stops charging, but is still actively monitoring
the battery voltage. The charger will remain “Silent” until the battery voltage drops to the
Set Recharge Volts
setting, at which time the charger will start another Constant Current/
Constant Voltage charge cycle (see Figure 10-1).
Default:
Time
Range:
Time, Amps, Hold CV Chg VDC
* Set CV Chg Done Time
– This setting determines how long the charger holds the bat-
tery voltage at the
CV Charge Volts
setting—based on a set time period. When using time,
the battery bank size typically determines the length of the
CV Chg Done Time
setting.
The larger the battery bank, the longer the time needed to ensure fully charged batteries.
If the setting is 0.0 hrs, the charger transitions to Silent charge stage immediately after
the charge voltage setting has been reached. If the setting is from 0.1 to 25.5 hrs, the
charger transitions to the Silent charge stage after the battery voltage has been at the
charge voltage setting for the selected time. Use Table 3-2 to assist in selecting the
CV
Chg Done Time
setting based on the AHr capacity of your battery bank.
Note:
After choosing
Set CV Chg Done Time
, the
Set Max CC/CV Time
and
Set Recharge
Volts
settings must be determined (see next page).
Default:
2.0 Hrs
Range:
0.1-25.5 Hrs
* Set CV Chg Done Amps
– This setting—which requires a battery monitor to be in-
stalled—determines how long the charger holds the battery voltage at the
CV Charge Volts
setting—based on a minimum current setting (also known as “return amps”). During the
Constant Voltage charge mode, as the battery charges, the current from the charger slow-
ly decreases. When this current decreases below the
CV Chg Done Amps
setting, the char-
ger transitions to the Silent charge stage. Most battery manufacturers recommend taking
approximately 5% of the total battery bank size, and consider the battery totally charged
when the charger’s return amps drops to this level. Check with your battery manufacturer
to
fi
nd out what the correct return amp settings are for your batteries.
Note:
After choosing
Set CV Chg Done Amps
, the
Set Max CC/CV Time
and
Set Recharge
Volts
settings must be determined (see next page).
Default:
20 ADC
Range:
0-250 ADC
