Powerwave Technologies 5JS0042 Linear Feed-Forward Power Amplifier User Manual Part 5

Powerwave Technologies Inc Linear Feed-Forward Power Amplifier Part 5

User Manual Part 5

044-05055 Rev. A 3-1OPERATING INSTRUCTIONS3-1. INTRODUCTIONThis section contains operating instructions for the Multicarrier Cellular Amplifier System.3-2. LOCATION AND FUNCTION OF AMPLIFIER MODULE CONTROLS AND INDICATORSPrimary +27 Vdc power is applied to the amplifier via a 100-amp circuit breaker (ON-OFF) locatedon the left side of the amplifier front panel.The plug-in amplifier module RF control and indicators, located in the center of the amplifier frontpanel between the cooling fans, are shown in figure 3-1. The status and RF control functions aredescribed in detail in table 3-1. The alarms are described in detail in table 3-2.Figure 3-1. G3X-800 Series (NTL107AA) Amplifier Module Control and IndicatorsSection3
044-05055 Rev. A 3-2Table 3-1. Amplifier Module Status Indicators and RF ControlNAME FUNCTION (Note: MCPA = Multicarrier Power Amplifier)+27VDCIndicator Green LED. When lit, indicates that the +27 Vdc supply is greater than+21 Vdc and less than +31 Vdc. If the +27 Vdc indicator goes out, theDC FAIL indicator will illuminate. This indicates that the +27 Vdc volt-age dropped below +21 Vdc.+15VDCIndicator Green LED. When lit, indicates that the +15 Vdc supply is greater than+12 Vdc and less than +17 Vdc. If the +15 Vdc indicator goes out, theDC FAIL indicator will illuminate. This indicates that the +15 Vdc volt-age dropped below +12 Vdc or increased above +17 Vdc.+5VDC Indicator Green LED. When lit, indicates that the +5 Vdc supply is greater than+2 Vdc and less than +7 Vdc. If the +5 Vdc indicator goes out, the DCFAIL indicator will illuminate. This indicates that the +5 Vdc voltagedropped below +2 Vdc or increased above +7 Vdc.-5VDC Indicator Green LED. When lit, indicates that the -5 Vdc supply is greater than-7 Vdc and less than -2 Vdc. If the -5 Vdc indicator goes out, the DCFAIL indicator will illuminate. This indicates that the -5 Vdc voltagedropped below -7 Vdc or increased above -2 Vdc.RF ON Switch Three position switch:Off (down position) - Turns off amplifier module.On (center position) - Normal amplifier on position.Reset (up position) - When toggled to reset position, all the red LEDindicators will turn on one at a time in sequence followed by all thegreen indicators one at a time in sequence; this will also reset the faultlatches. If the switch is held in the reset position, a microcontroller re-set will occur. This will be verified by the LEDs toggling state again.The switch is spring loaded to return to the normal ON position whenreleased. If a fault occurs and the MCPA is disabled, the alarms canbe cleared and the MCPA enabled by this reset position. The functionsof the switch are disabled for five seconds after a power-up condition.
044-05055 Rev. A 3-3Table 3-2. Amplifier Module Alarm IndicatorsDefinitionA ‘Minor Alarm’ will flag a potential fatal problem by the LEDs and the MCPA fault will be inevaluation. A ‘Critical Alarm’ is indicative of a fatal problem. The fault indicator will latch on andthe MCPA module will be disabled. A ‘Major Alarm’ indicates a major problem but the MCPAmodule will not be disabled. Both ‘Major Alarm’ and ‘Critical Alarm’ will be sent to the host systemvia J1 in the back plane of the MCPA subrack (see figures 2-1 and 2-2).ALARM CATEGORY LED MCPAMODULEMCPADISABLESIGNAL(Pin 4 inTable 2-5)CONDITIONLPA DISAB. Critical Red Disable High Unit is manually switched off usingthe front panel RF ON switch, or dis-abled by a serial command or autoshutdown by an alarm condition.Fan Fail (one) Major Red Enable Low Any fan failureVSWR Minor Red Enable Low Reflected power detected at output>25 WVSWR Critical Red Disable High Reflected power detected at output>80 W longer than approx. two min.Low Pwr Minor Red Enable Low Rack controller detected MCPA out-put is 3 dB below that of the otherMCPA in the system.Low Pwr Critical Red Disable High Rack controller detected low powercondition for more than approx. twominutesDC Fail Minor Red Enable Low One of the internal DC voltagesdropped below or exceeded the safethreshold levelDC Fail Critical Red Disable High Voltage out of range for longer thanapprox. two minutes (Note 2)DC Fail(Over voltage) Minor Red Disable Low +27 Vdc input >31 V detected (note 3)DC Fail(Over voltage) Critical Red Disable High +27 Vdc input >30 V for longer thanone sec. after initial detection of DCinput >31 V (Note 3)High Temp Minor Red Enable Low High temperature detectedHigh Temp Critical Red Disable High High temperature detected for longerthan two minutesLoop Fail Minor Red Enable Low Loop failure detectedLoop Fail Critical Red Disable High Loop failure detected longer than twominutesOver Pwr Critical Red Disable High MCPA module output power >200watts (Note 4)Over Pwr Critical Red Disable High Input power >5 dBmNOTES:1. RS-485 serial alarm will follow LED status.2. The appropriate status LED shall turn off indicating which voltage is out of its range.3. When overvoltage is detected:a) MCPA shall shut down (disable)b) Turn on red DC Fail LEDc) Set flag for DC Fail alarm
044-05055 Rev. A 3-44. When overpower is detected:a) MCPA shall shut down (disable)b) Turn on Over Pwr LEDc) Set flag for Over Pwr alarmd) The MCPA module shall use a peak power detector to determine the overpower fault.3-3. INITIAL START-UP AND OPERATING PROCEDURESEach amplifier module has two operating controls, both located on the front face of the module:the power ON - OFF switch and the RF ON - ON/OFF/RESET switch. To perform the initial start-up, proceed as follows:1. Double check to ensure that all input and output cables are properly connected.CAUTIONBefore applying power, make sure that the input and output of theamplifier are properly terminated at 50 ohms. Do not operate theamplifier without a load attached. Refer to table 1-2 for input powerrequirements. Excessive input power may damage the amplifierNOTEThe output coaxial cable between the amplifier and the antenna mustbe 50 ohm coaxial cable. Use of any other cable will distort the output.2. Verify that all amplifier front panel switches are in the OFF position.3. Turn on supply that provides +27 Vdc to the amplifier system. Do not apply an RFsignal to the amplifier system4. One at a time, place the ON - OFF circuit breaker on each amplifier in the ON posi-tion. Visually check the indicators on each amplifier module, and verify that the fol-lowing indicators are on:a. LPA DISAB. indicator (red) should be on.b. The +27VDC, +15VDC, +5VDC and -5VDC indicators (green) on the ampli-fier module should be on.5. Set both RF ON switches to the ON (center) position. All red LEDs should turn offafter six seconds.6. Turn on external exciter/transceiver and apply RF input signals.7. The MCPA system is designed to:a) Adjust the gain automatically to achieve the target output power during the initiali-zation phase of the MCPA system in a cellsite. This will be done by an operatorusing a portable PC interfacing with the MCPA system with any number of radiostransmitting.b) After achieving the target power upon the completion of the initialization, theMCPA system will limit the power to a maximum of +0.7 dB above the availablepower (Pmax). The available power with one module in the shelf is 100 watts. Theavailable power with two modules in the shelf is 200 watts. The APC shall notengage until the output power has exceeded the threshold power (Pmax +0.4 dB).At this time an APC alarm will be declared. Note the gain will NOT be adjustedcontinuously after the initialization phase is complete.If the MCPA system is driven such that the VVA runs out of dynamic range, then theMCPA will shut down immediately causing the ENABLE alarm to be activated as well asthe critical alarm.

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