Verifying Rf Alarm And Rf Fault Trip Points - CPI 0102324500rR Manual

e. Press the Line 3 button located below the display. Lines 3 and 4 will now display the
default meters (Line 3–Helix Voltage and Current; Line 4–Attenuator).
4. Ensure that the attenuator is set to maximum attenuation.
a. To quickly get to the attenuator setting adjustment, press the SPECIAL button followed
by the . (decimal) button.
b. Key in 01, the display will change to attenuator input.
c. Key in 25.0 to set the attenuator to its maximum.
(The attenuator may be set by keying a desired attenuator setting directly followed by the
ENTER button or pressing either arrow key to adjust the setting in 0.1 dB increments.)
5. Press the TRANSMIT pushbutton. The CHPA will transition from the Standby state (the
STANDBY LED extinguishes), through the Beam On Sequence (BONS) state (TRANSMIT
LED flashes), to the Transmit state (TRANSMIT LED is solidly lit).
Note: At this point of the procedure, the Low RF Alarm may have tripped.
This is indicated by LoRF on Line 2 of the display.
6. Slowly increase the RF output by repeatedly pressing the down arrow key to decrease the
attenuator setting in 0.1 dB increments until the output reaches 600(500W for the 600W DBS
Band unit 415W for the 500W DBS band unit) as indicated on the front panel. Write down
this attenuation value because it will be used later.
a. The FAULT LED should remain off.
b. While adjusting the RF power, LoRF or HiRF (Low RF Alarm or High RF Alarm) should
not appear on Line 2 of the display. Recheck the alarm settings if necessary.

4.9 Verifying RF Alarm and RF Fault Trip Points

This part of the procedure verifies that the RF alarm and RF fault operation is functioning
normally. These settings were verified in a previous procedure. (Refer back to that procedure if
necessary.)
7. Continue to adjust the RF SETTING control to just over 600 W(500W for the 600W DBS band
unit 415W for the 500W DBS band unit). The High RF Alarm should come on; this is
indicated by the HiRF on Line 2.
8. If possible, continue to adjust the RF SETTING control to just over 620 (425W for the DBS
band unit). The user will observe Auto Fault Recycle operation during this step. The
following sequence will occur within approximately 3 seconds:
a. The TRANSMIT LED will extinguish and the FAULT LED will be lit briefly.
b. The High RF Fault message will appear briefly.
c. The TRANSMIT LED will flash as the CHPA recycles through the Beam On Sequence
state back to the Transmit state.
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