AC112Q-3, AC125Q-3, AC150Q-3, and AC165Q-3 Operations Manual.... 59
9
CALIBRATION
In an uncalibrated state the input and output voltage and input current metering system should be
within 3%. The uncalibrated output current meter is normally 5% low. For calibration an external
reference voltmeter will be required along with a calibrated current transformer or probe. If the
system is to be calibrated on board using the yacht’s loads, attempt to shut down all transient
(fluctuating) loads if possible. Cyclic loads will complicate the current meter calibration process.
This procedure must also be followed after replacing the battery on a maintenance basis.
1)
Turn the system off and secure input power. Remove the front cover.
2)
Remove the lower front protective panel from the system, and set it aside. The input and
output power terminal blocks will be located at the bottom of the power panel located in the lower
compartment. Refer to Section5 Installation for additional information. Re-apply power to the
system and bring the system on-line. Transfer the yacht’s load (or external test load bank) to the
converter.
3)
Shore Power Calibration
- Press the SHORE POWER
(2)
button under the LCD
(1)
display. Use an external reference meter and current transformer or clamp to measure the input
(shore power) power at the input terminal block. To enter the meter calibration screen, press and
hold the SHORE POWER
(2)
button down for 7 seconds, or until the calibration display appears,
then release the button. Use the SHORE POWER
(2)
button to move the cursor to the parameter
to be calibrated, voltage or current. Change the selected parameter by pressing the F1
(13)
button
to increment and the F2
(13)
button to decrement the displayed value. When all displayed values
equal the values measured by the reference meter, pressing the SYSTEM STATUS
(5)
will store
the new calibration values and return the display to the System Status display. Press the SHORE
POWER
(2)
button to verify proper shore power meter calibration.
