Crown FMX250 Manual do Utilizador descarregar pdf (Página 22)

3–3Operation

6. Turn on each main power switch located on the front panel of each power

supply.

Power

Air Intakes/Filters

Power Switch

Illustration 3–3 PS2000 Front Panel Functions

7. If a remote control is being used, enable the power supply using the remote 

control unit. If not, one of two methods should be done. The first method is to 

locate the Remote/Local switch on the Transmitter Controller and select "Local" 

then enable the Local control with the "Local Enable" switch by turning it to the 

ON position (up). The second method is to keep the Remote/Local switch in the 

"Remote" position and short pins 6 and 7 of Port A together on the Transmitter 

Controller. When either of these mothods are completed, the power supplies 

should turn on (the supplies typically take 30 - 45 seconds to power up.)

NOTE : During power up, it is normal to observe a VSWR fault 

condition on one or both of the amplifiers. However, if after a minute or 

two the fault does not clear itself, consult the factory for additional 

help. Also, if there is greater than 200 watts difference between each 

amplifier, this condition could occur as well. Adjust the power control 

pots for an RF power difference of less than 200 watts.

8. Adjust the PA1 and PA2 controls on the Transmitter Controller alternately in 

less than 200 watt increments until the desired output is achieved as read by the 

display and/or an external watt meter. When reaching the final output power 

level, ensure that the RF power output from each of the PA's are within 100 watts 

of each other to ensure best performance of the combiner. These settings will 

limit the maximum output power that the system can achieve. To set the limit at 

a lower value, the "local" power adjust pot (Power set R62) located behind the 

front panel of each PA2000 can be adjusted as well.

Note : The local power set pot is unconventional in that a Clock-wise rotation 

will lower the power instead of raise the power.

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Crown FMX250 Manual do Utilizador Página 22