Owner`s manual

11
This critical push-button potentiometer 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 set by Manzanita Micro to 48 volts. In the event that
adjustment is desired, please refer to Figure 05 and follow the instructions on the
next page. When the battery pack voltage hits the peak limit the yellow LIMITS LED
will come on along with the flashing blue TIMER LED and the charger cuts back.
Figure 05 : Optional Digipot Peak Voltage Adjustment
IMPORTANT WARNING!
It is not recommended to change the digipot when the charger is moving power. Simply pressing even one of
the buttons on the digipot can drastically and immediately change the charger's peak output voltage! It is the full
responsibility of the end-user to make sure that the digipot is set to a value that is safe for the energy source
that the charger's output power is connected to! Furthermore, the numbers on the digipot may not be exactly
accurate down to the volt so users should check at the end of the first charge with a calibrated voltmeter to
make sure the yellow limits light comes on and the PFC charger is not exceeding the maximum safe voltage
level for the customer's given scenario.
The optional digipot makes it very easy to adjust the peak voltage set point, therefore it is up to the user to
check and make sure that no person or thing changed the voltage setting to a level inappropriate for the battery
pack being charged. The digipot displays the approximate peak voltage set point level reading from left to right.
So in Figure 05, the example photo shows the digipot set at 190 meaning that the charger's maximum output
voltage should be about 190 volts DC.
The digipot display is similar to an odometer in a vehicle. Pressing the “+” button above a numeric digit will
increase that digit by one whole number until the number “9” is reached at which point if it is pressed again it will
drop back to “0”
Pressing the “-” button below a numeric digit will decrease that digit by one whole number until “0” (zero) is
reached at which point if it is pressed again, it will jump up to “9”.
WARNING! Be very careful especially with the left-most digipot buttons that it never get's accidentally set to a
high number like “9” because that would make the charger try and output maximum voltage up to 900+ volts
which could damage the battery pack! The internal limit on the charger should be set at 450VDC and so even if
it doesn't put out 900 volts, setting the digipot to display any number greater than 450 should make it
automatically output at least up to 450VDC!