Using a PT Controller: Setup
©
2017 Sensata Technologies
Page 125
• 07B
Absorb Done (Time
,
Amps, SOC)
– This setting identi
fi
es whether time, amps, or SOC
are used to determine when the second stage of battery charging (Absorption) is
fi
nished.
Absorption is the charge process that attempts to fully charge the batteries. Once this stage
is
fi
nished, the charge cycle transitions to the third charge stage (Float).
Note:
If “
CC/CV Controlled
” displays on this menu’s screen, you will not be able to adjust the
settings as “
CC/CV
” has been selected as the battery type from the
07A Battery Type
menu.
Info:
If the Absorb stage is short or terminated, the batteries may not receive a full
charge. In contrast, if the Absorb stage is too long the batteries may be overcharged.
Either scenario may lead to poor performance or damage to the batteries. Contact the
battery manufacturer to ensure the best charge settings are used for your batteries.
◊
Set
Absorb Done Time
–
Absorb Done Time
is used when a speci
fi
c period of time is
determined to be best for ending the Absorption stage. When using time, the size of the
battery bank amp-hour capacity typically determines the length of the
Absorb Done Time
setting. The larger the battery bank, the longer the absorb time needed to ensure a full charge
to the batteries. Taking speci
fi
c gravity readings of the batteries and adjusting the absorb
time may be needed in order to obtain the appropriate absorb time for your battery type and
battery bank capacity. See Table 3-2 to help select the
Absorb Done Time
setting based on
the amp-hour capacity of your battery bank.
Default setting:
2.0 Hrs
Range:
0.1-25.5 Hrs
◊
Set
Absorb Done Amps
–
This setting—which requires a battery monitor to be installed
—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 Absorb charge
mode—as battery charges—the current required by the battery decreases. When the return
amps decrease below the
Absorb Done Amps
setting, the charger transfers from the Absorption
charge stage to the Float charge stage. Most battery manufacturers use a speci
fi
c formula
to determine the return amps needed to fully charge their type of battery. The formula used
by most manufacturers to absorb the batteries is C/20, where C=Battery Bank’s Total Amp
Hours. Basically, they take 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.
Default setting:
20 ADC
Range:
0-250 ADC
Figure 12-3, Multi-Stage Charging (PT Controller)
Bulk Charging
Absorb Charging
Float Charging
Voltage
Current
Max Charge
Amps
Absorb Done
(Time, Amps or SOC)
CU
RRE
N
T
&
V
O
L
T
AG
E
TIME
Absorb
Volts
Float
Volts
First Stage
Second Stage
Third Stage
PT Status
Charge Stage
Содержание ME-ARTR
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