Using a PT Controller: Setup
©
2017 Sensata Technologies
Page 127
CAUTION:
If using “
OFF
”, the batteries can be held at a high voltage for an extended
time. Monitor the batteries to ensure they are not overcharged.
Info:
If the time the charger has been in Bulk, Absorption, or EQ charge modes exceeds
the
Max Charge Time
setting, the “
PT
Max Charge Time
” scrolls across the LCD display
.
Where should I set my Max Charge Time?
To ensure a complete charge cycle is accomplished,
adjust the
Max Charge Time
setting to a time period that will normally be longer than the settings
in the following SETUP menu items:
07B Absorb Done Time/Amps/SOC
. The
Max Charge Time
setting has priority over these menus and will stop the charge cycle once that setting is satis
fi
ed.
Example:
Max Charge Time
set at 6 hours, but the
Absorb Done Time
is set at 8 hours. After 6
hours in the Absorption charge cycle, the charger then transitions to the Final Charge stage.
• 07D
Bulk Start
–
The settings available from this menu allow the PT controller to automatically
start a Bulk charge cycle based on different conditions (i.e., daily at sunup, battery voltage,
or battery SOC). One, two, or all three of these conditions can be enabled to determine when
a Bulk charge cycle begins.
◊
Daily/SunUp
–
This menu provides the option to set the PT controller to start the Bulk
charge cycle each new day at sun-up
.
Note:
A “new day” is de
fi
ned as: for a networked PT = after midnight, for a standalone PT =
two hours of no sun.
Note:
If the
Daily/SunUp
bulk start condition is set to
No
(disabled), on a new day the PT
controller stays in the same charge mode as the previous day.
Default setting:
YES
Range:
YES, NO
◊
Low VDC
–
This menu provides the option to set a DC voltage level that will start the Bulk
charge cycle when the battery voltage decreases to or below this setting continuously for at
least one minute. This one minute delay time is to prevent a Bulk charge cycle when a heavy
load causes the battery to momentarily dip
.
Default setting:
10.0 VDC (12v), 20.0 (24v), 40.0 VDC (48v)
Range:
OFF, 9.0-16.0 VDC (12v)
,
18.0-32.0 VDC (24v), 36.0-64.0 VDC (48v)
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.
Where should I set Bulk Start – Low VDC?
The Bulk Start voltage must be high enough to not
over-discharge the battery, but low enough to keep from starting the Bulk charge unnecessarily.
Typically, battery voltage SOC charts show approximately 12.2 VDC (for a 12-volt system) to be
approximately 50% of the battery capacity. However, these charts show the battery at “rest”,
meaning it has no load connected and has been at rest for a minimum of 30 minutes. While this
voltage is accurate under these at rest conditions, this same voltage with a load applied means
the battery is well above 50% SOC. Normally, the battery is loaded (inverter connected or DC
loads), so the voltage used to determine 50% battery capacity should be set much lower than
what is shown on typical battery voltage charts. A typical bulk start voltage setting would be
between 11.0 VDC - 11.5 VDC (for a 12-volt system).
Info:
The
Bulk Start – Low VDC
feature uses the DC voltage displayed from the
METER:
07C PT Volts
menu to determine when to start another Bulk cycle.
◊
SOC
–
This menu requires the ME-BMK to be installed and sets the battery’s SOC level to
start the Bulk charge cycle. The SOC value is provided from the attached battery monitor and
is shown on the
METER: 05A BMK SOC
menu display. The SOC level is considered the best
overall method for determining when to start another Bulk charge cycle. Since the ME-BMK
already uses voltage, time, and current to determine the true SOC of the batteries, there is
little guesswork or calculating needed to determine what settings to use.
Default setting:
80%
Range:
OFF, 50-100%
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