Owner`s manual

9
User Control Panel
The user interface panel is the long blue panel with white or yellow text near the top
of the PFC charger. It is important to familiarize yourself with the LED indicators,
the VOLTS TRIM potentiometer (if so equipped) and the adjustable AMPS knob.
Below are explanations of each feature in order from left to right. Refer to figure 02
or the 8A Control Board section (figure 13) for specific locations.
“VOLTS TRIM
”
This critical adjustment potentiometer controls the peak DC voltage ceiling that the
charger will allow the batteries to reach before limiting the current. Unless specified
otherwise, the DC output voltage limit is specifically calibrated and set by Manzanita
Micro to 48 volts. In the event that adjustment is desired, please follow the
instructions below. Starting in 2010, a special insulated screw driver for adjusting the
volts trim is shipped with each new Manzanita PFC charger.
ATTENTION! If your charger has an optional Digipot push-button device for peak
voltage adjustment please see the section immediately after this one titled: Optional
Digipot Peak Voltage Adjustment.
NOTICE! Always use an appropriately sized insulated screw driver when adjusting
the voltage trim potentiometer. Suitable drivers are available for purchase from
Manzanita Micro or other electronics components manufacturers. (Mouser part #:
594-8T000, Vishay/Spectrol Adjust Tool, www.mouser.com
)
figure 03. Adjustment Tool # 008T000
NOTE: If the battery pack is not heated for any reason such as outdoors in a cold
climate, the peak charging voltage threshold may need to be raised in order to
assure a complete charge. This is especially true for lead acid batteries. Many users
turn the volts trim to the absolute maximum safe level for the batteries during the
winter and then back down to normal during the summer months. Always consult
your battery manufacturer for information on the peak “fully charged” voltage
specifications and how they might change based on temperature.
NOTE: The peak voltage regulation set point on a Manzanita Micro charger is
accurate to within 5 volts or less. Follow the “Volts Trim Calibration” instructions on
the next page and make the initial adjustment with the amps knob completely down
so that no current is flowing. Gradually turn up the amps knob and nudge the volts
trim potentiometer up accordingly. Use caution on the first charge cycle and make
sure to check that the point at which the charger volts trim (peak voltage) limit is
reached is really the correct voltage for your specific batteries.
VOLTS TRIM CALIBRATION WITH ORIGINAL ROTARY POTENTIOMETER: