Harris Platinum Series Technical Manual

Harris Platinum Series Technical Manual Manual pdf 34 page image

used most often for the remote control system failsafe interlock,diplexer air switch, etc.VSWR FOLDBACK ACTIVE: Indicates elevated VSWR hascaused the transmitter to reduce its output power by someamount. Foldback allows uninterrupted operation if the VSWRslowly increases. If the VSWR exceeds a certain threshold, thefoldback will begin to operate. As the VSWR increases, forwardpower will be reduced to maintain a constant level of reflectedpower. If the VSWR decreases, power output will increase to-ward the original setting. Foldback will end and the lamp will beextinguished if the VSWR drops below the threshold.While VSWR foldback is active, VSWR fault detection is inhib-ited. However, protection from high VSWR is then provided bythe individual module VSWR fault circuits.MODULE FAULT: Indicates one or more of the cabinet RFamplifier modules is reporting a fault.MONITOR FAULT: Indicates the monitor has failed and allcalculated readings may be incorrect.PHASE LOSS: Indicates the control cabinet phase loss detectorsenses loss of one of the three phase power lines, voltage belowthreshold, or reversal of the phase sequencing. (If all cabinetindications are dark the phase feeding the logic power suppliesis probably lost.)AURAL DRIVE CHAIN FAULT (optional): Indicates an auraldriver has failed in the parallel aural driver chain.EXTERNAL INTERLOCK: When open, the External Interlockwill prevent the transmitter from turning on. The circuit must beclosed through the external interlock device for normal opera-tion. The External interlock will turn the transmitter off if it isopened. It can be programmed either to require a manual ONcommand to restart the transmitter, or to restart the transmitterautomatically (check Main Controller) after the interlock isre-closed.3.1.4 User Display PanelThis section contains instructions for the user display panel.Refer to Figures 3-2 and 3-3.NOTEScreen Blanking Option - Refer to Figure 5-7 for information onsetting Screen Blanking on or off. If screen blanking is enabled,the screen will blank after 1 hour of inactivity on the displayfunction keys. Any display function keypress after screen blankingwill redisplay last screen. While screen is blanked, alarms thatare normally shown on the screen will not be displayed on thescreen until the screen is unblanked.Figure 3-2. Monitor Screen Flow3-2 888-2365-001 Rev. B: 1/11/1999WARNING: Disconnect primary power prior to servicing.