Airport 828HC, Instruction Manual

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Airport Lighting Company
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7.3.4 Calibrating Input Voltage
Before continuing, refer to Section 7.3.1 How to Determine if Recalibration is Needed . If it is
determined that recalibration is required, complete the following steps fully to ensure the most
accurate results. Read all steps before beginning. Contact Airport Lighting Company for additional
information as needed.
Note: a resistor load bank, such as can be provided by Airport Lighting Company, is recommended
provide a purely-resistive load to the CCR during calibration. Ideally, the CCR should be loaded at
100% of its kW rating for the most accurate calibration.
□ Before doing a full recalibration, complete a “Calibrate Zeros” of the CCR. Refer to Section
5.1.2 Calibrate Zeros . Once the Calibrate Zeros is done, check to see if the reading
discrepancy still exists. If it does, continue.
□ Connect a load bank to the CCR.
□ Put the CCR into Local mode.
□ Open the CCR door and pull the door switch plunger toward you laterally to bypass the
safety interlock.
□ Navigate to the following menu, but do not enter the “ Input Voltage ” screen yet:
Configuration Menu > CCR Config > Calibrate > Input Voltage
□ The LOCAL Up and LOCAL Down arrows will still operate while in the menu, allowing for
easier calibration. Put the CCR on the lowest brightness step.
□ Once the CCR is on the lowest brightness step, push the left DOT button to enter the
“ Input Voltage ” screen.
□ Using voltage probes on a known, calibrated DMM, measure the input voltage. It may
be measured at the contactor, at the power-side fuse block, or on the control
transformer.
□ Check the DMM-measured value. Use the UP and DOWN arrows below the screen to
adjust the calibration value. Once the values match, push the left DOT button to accept.
□ Put the CCR on the highest brightness step, while staying in the calibration menu.
□ Check the DMM-measured value. Use the UP and DOWN arrows below the screen to
adjust the calibration value. Once the values match, push the left DOT button to accept.