OHRIJA Charger 900W-12V Charger Using Adjustable Resistance Calibration Instruction Manual

OHRIJA Charger 900W-12V Charger Using Adjustable Resistance Calibration Instruction Manual

Tools to calibrate voltage and current need to be prepared: Torx screwdriver, small 1-word screwdriver, multimeter, ammeter. If there are other tools can also replace them.

Calibrate voltage and current Step 1: Open the screws around the charger cover (red arrow part)

After opening the cover, confirm the function of each knob. The charger with display screen needs to confirm the knob function of the display screen.

The knob function is as follows:

Calibration voltage:

First use a multimeter to measure the voltage while using a 1-bit screwdriver to turn the VR1 knob to turn left to reduce the voltage. Turn right to increase the voltage.

Note: They can only be adjusted between DC 10V-18V, beyond which there is a risk of damage.

Chargers with display need to be calibrated synchronously via the intermediate voltage knob on the display panel

Note: The output voltage of the display screen and the charger needs to be consistent, with an error of about 10%.

Calibration current:

After connecting the load, use an ammeter to measure the current. Use a 1-bit screwdriver to turn the VR2 knob to turn left to reduce the current. Turn right to increase the current.

Note: They can only be adjusted between DC 28A-30Amp, beyond which there is a risk of damage.

The charger with display screen needs to be calibrated synchronously through the knobs on both sides of the display board (coarse calibration and fine calibration)

Note: The output current of the display screen and the charger need to be consistent, with an error of about 10%.

Calibrate the third stage trickle charge current:

After connecting the load, use the ammeter to measure the current. Turn the VR3 knob to the left to reduce the current. Turn the VR3 knob to the right to increase the current.

Note: The third stage trickle charge current does not have to be adjusted.

Summary:

Since it is a live operation, special attention should be paid to safety. Tools should not be close to the AC input,

In general, we only need to calibrate the voltage or current, and the trickle charging current in the third stage does not need to be adjusted.

Chargers with a display need to be calibrated synchronously through the knob on the display panel,

The output voltage and current of the display screen and the charger need to be consistent, with an error of about 10%.

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