Owner`s manual

User Control Panel

The user interface panel is the long blue panel with yellow text near the top of the PFC

charger. The main things most users need to be concerned with are the LED

indicators, the VOLTS TRIM and the adjustable AMPS knob. Below are explanations of

each feature in order from left to right. Refer to figure 02 for specific locations.

“VOLTS TRIM”

This controls the peak DC voltage ceiling that the charger will allow the batteries to

reach before limiting the current. Unless specified otherwise, the voltage limit is

specifically calibrated and set by Manzanita Micro to 191 Volts (for a 156V nominal

pack.) 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.

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 will likely 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 maximum up 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 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 limit is reached is really the correct

voltage for your specific batteries.