4-38 888-2408-002
WARNING: Disconnect primary power prior to servicing.
Overall System Theory
Once the operator has set a power level in kW in these screens, the controller uses
the OP_APC_Factor to find the DAC_APC_REF that would represent each of the
power levels and sets that number as the power level limit. This maximum
DAC_APC_REF setting is called DAC_MAX and is calculated for each mode from
the formulas below:
For HIGH ON mode:
DAC_MAX = MAX HIGH SET (kW) / APC_Factor
For LOW ON mode:
DAC_MAX = MAX LOW SET (kW) / APC_Factor
For UPS mode:
DAC_MAX = UPS SET (kW) / APC_Factor
DAC_MAX [HOME, MORE, CONFIGURATION C,B] is the display variable
which will contain one of the above numbers depending on which mode the
transmitter is in. Once these are set, the DAC_APC_REF in that mode can never go
above the DAC_MAX setting.
Example: If the transmitter is calibrated at 5kW (HIGH ON), and the desired MAX
Power setting is 6kW, this would be entered into the MAX HI SET screen.
Remember that for 5kW the nominal DAC_APC_REF is 660. The micro would
now use the formula:
DAC_MAX_HIGH = MAX HIGH SET (kW) / APC_Factor
DAC_MAX_HIGH = 6kW / 7.58 = 792
This is now the highest possible number for the DAC_APC_REF and will limit the
transmitter power to 6kW. To prove that:
FWD PWR = APC Factor * DAC_APC_REF
FWD PWR = 7.58 * 792 = 6kW
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