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LL DOC0302-R58. MaintenanceFM dehydrators contain only high quality components and operate largely maintenance-free.The desiccant does not require any exchange, since it is continuously and automatically regenerated.The pump membrane has a life expectancy of 10,000 h assuming a 100% duty cycle. The pumpmembrane must be exchanged after reaching this operating time (see 8.2 Removal of pump andmembrane exchange).The filters must also be changed after reaching this operating time (see 8.3 Filter exchange).Extreme environmental influences may demand an earlier exchange.Follow the steps below to exchange the drying cartridge:Warning: Withdraw main plug!8.1 Removal of top partI.Remove screws 6 xI.Remove connector (black) of 24 Vpower supplyFM GerätebauSeite 14 von 3608.02.16

LL DOC0302-R5II.Release hose connection:Press blue ring and loosen hose.8.2 Removal of pump and membrane exchangeII.Loosen hose connectionIII. Remove pump connectorIV. Remove 4 nuts, remove pumpV. Unscrew pump coverVI. Pump cover from belowFM GerätebauSeite 15 von 3608.02.16

LL DOC0302-R5VII. Pump without coverAdmission valveMounting screwMembraneVIII. Complete membrane set withadmission valve and mountingscrewIX. Individual parts of membrane setMind the locking device plug.X.Pump cover with ventile supportXI. Ventile support with outlet valveFM GerätebauSeite 16 von 3608.02.16

LL DOC0302-R58.3 Exchange of filtersXII. Loosen screwXIII. Remove holder upwardsXIV. Renew filterXV. Loosen screwsFM GerätebauSeite 17 von 3608.02.16

LL DOC0302-R5XVI. Remove holder with humditysensor upwardsXVII. Replace filterFM GerätebauSeite 18 von 3608.02.16

LL DOC0302-R5Note:After maintenance, the corresponding meter has to be restarted with the command "set rate" andthe desired number of hours until the next maintenance.8.4 Spare PartsPos01PartLL 0011040203040506LL 000780LL 000781LL 000313LL 000201LL 000202FM GerätebauNameSpare parts kit for maintenanceafter10,000 h operating timefor 300 l deviceconsisting of:Membrane setOutlet valveFilterScrews DIN 7380 A2 M5 x 10Screws DIN 7380 A2 M4 x 6Seite 19 von 36PieceRemark1 piece1 piece1 piece2 pieces4 pieces6 pieces08.02.16

LL DOC0302-R59.FirmwareIf the dehydrator is connected to the terminal on switch-on, and at the same time, the escape key on thedevice is pressed, the following menu is displayed:Bootloader Menu 1.Firmware update2.Main program Firmware updateEnter "1". The text "Send binary data" is displayed.Select "Transfer Send file".Select "Xmodem" protocol.Use "Browse" to select the binary file for the firmare update.Click on "Send". Note: Make sure to conclude all steps within 30 seconds after accessing the firmwareupdate, otherwise the update will be canceled.Enter "2" to start the main program.If the firmware update is interrupted with a error message (error number is displayed in the terminalprogram), you can try to start the firmware update again. If this is unsuccessful, the mainboard must besent to FM for reprogramming.After a successful firmware update "Restart System" is displayed.Either disconnect the terminal connection or enter "2" in the bootloader menu. Now restart the dehydratorby switching it on and off.Error descriptionNumber:Type of error:123File write or delete failed„Command Sequence error“ delete failed flash memory„Command Sequence error“ file write failedFlash memory567Incorrect data package receivedIncorrect ones complement - XMODEM transfer errorChecksum errorXMODEM transfer errorTerminal settings: see USB interface, page 11.10. Description of the device control electronicsThe device control monitors the ventilation of the aerial system with dry air. It regulates the pressureinside the waveguide at a pre-determined pressure interval. The automatic control system is comprisedof the processor, a pressure sensor, the waveguide system, a pump, and up to three solenoid valves.Furthermore, the dew point (optional) in the pressurized air system and the internal equipmenttemperature are monitored. The dew point can be displayed (this can be configurated via a softwareswitch, see page 32). If the dew point display is suppressed, there will only be a warning if the relevantlimit is exceeded.FM GerätebauSeite 20 von 3608.02.16

LL DOC0302-R5The controller can be set to dry the air with two cartridges. These are used alternatively and can beregenerated through heating by using the heating element and by ventilating with air pumped in oppositedirection to the normal flow direction.This is conducted: after 168 operating hours after an adjustable working time of the compressor (between 1 and 25 hours) after exceeding the humidity limit (maximal humidity - 10 %) manually via the keypad via the USB interfaceVia the software switch of the serial interface settings regarding installation of two drying cartridges andhumidity sensor can be made (password required).There are numbers of hour-meters, for recording the periods of operation (total hours, operational tie ofthe pump and duration of the ventilation), the totals being saved automatically each hour to a non-volatilememory (EEProm). The hours of operation may also be saved manually. The system may therefore beshut down with the current meter readings, and switched back on again, to resume the count.While the system is in operation, various error conditions are detected, shown by the LEDs, and saved tothe EEProm. All conditions referring to a fatal error continue to be shown on an alarm contact. The errormessages are saved to storage so that they may be displayed again after the power supply has beeninterrupted.The system may be operated via serial interface, or from the control panel on the controller. The softwareis available in English and German. The language can be selected via the menu or the serial interface.Typos on the edit line can be deleted with backspace.The firmware can be updated via the serial interface (see page 20).10.1 RegenerationDuring regeneration the drying cartridges in the device are being dried. The switching between the dryingcartridges is carried out cyclically according to the value "regpt". During the regeneration process theactive cartridge, which has been used to dry the air, is replaced by the second cartridge, which will beactive now. The previously active cartridge is passive during air ventilation and is being regenerated.Regeneration consists of two phases which together amount to a duration of at least theat 5 minutes.theat is the heating time and is adjustable to a duration between 30 and 180 minutes.In the first phase (theat minutes), the cartridge is heated using a heating power that can be set to bebetween 10 and 100 %. The air flows from outside through the active cartridge and in the oppositedirection through the regenerating cartridge to the outside.The second phase is used to let the cartridge cool down, i.e. it will not be heated any more, but will beventilated with air.The center LED indicates a regeneration process. This is permanently lit during the first phase and blinksduring the second phase.If overheating (ϑ 65 C) of the equipment occurs during the heating phase, a temporary thermal error willbe displayed. The heating phase will be interrupted and the cooling down phase will start immediately. Inthis case there will also be a regeneration period of at least 35 minutes.However, if the time remaining until the next regeneration is reduced to 6 hours. A fatal thermal error willbe displayed after four successive unsuccessful attempts. This method ensures that the regeneration isshifted to a more convenient time of day, e.g. the night hours. An alarm-contact will be generated duringa fatal error even though a temporary error will not be displayed here, but this can be read from the errorLED.FM GerätebauSeite 21 von 3608.02.16

LL DOC0302-R5If it is necessary to ventilate the waveguide during the regeneration process (pressure drop), valve 0 willopen and the necessary air will be diverted from the regeneration operation.Regeneration can be instigated in 5 different ways: after 168 operating hours after an adjustable working time of the compressor (between 1 and 25 hours, adjustable in 1minute steps) after exceeding the humidity limit (maximal humidity - 10 %) manually via the keypad via the serial interfaceThe reason for regeneration is displayed via the serial interface. An exception is the manually initiatedregeneration.Regeneration can be canceled by a command via the serial interface.If the software switch 7 is "on", regeneration starts after device switch-on.10.2 Pressure control circuitThe pressure in the waveguide system is measured several times per second. If the pressure fails toreach the pressure limit setting (pressure low limit),valve 0 will be opened (and in the two-cartridgeversion valve 1 or 2 belonging to the active cartridge) and the pump with the preset power setting will beswitched on. When the maximum pressure (also adjustable / pressure up limit) is reached, the relevantvalve will be closed and the pump will be switched off again. If the ventilating process time period isexceeded (tpmax), an air pressure drop will be recognized and this will be displayed via the LED and thealarm-contact. This error can only be reset manually, however it does not deactivate the pressure controlcircuit. If the air pressure is less than the pressure setting (pressure min), this will be evaluated as a lowpressure error after tplow is expired and will be displayed via the LED and the alarm-contact.The following pressure control circuit parameters can be configured: Pressure interval.The standard start threshold is 20 hPa, the standard shut-down threshold is 30 hPa. The startthreshold can be set between low pressure limit 1 hPa and shut-down threshold - 1 hPa; theshut-down threshold can be set between start threshold 1 hPa and 40 hPa. Low pressure limit (Low Pressure / default 10 hPa).If the pressure is lower than or equal to this threshold, a low pressure error will be displayedafter a pre-set time has expired (0 sec. to 4 min. 59 sec.). This monitoring is only carried out ifthe alarm time is inactive or the upper limit of the pressure interval has been reached at leastonce. Alarm time talarm.Counts the maximum time that can expire to reach the lower limit of the pressure interval. If thistime is exceeded, a pressure drop error is displayed. If the lower limit has been reached once,the alarm time will be deactivated. Furthermore, the alarm time is only active if the maximumpump time tpmax is set on indefinite. Before the alarm time or tpmax are expired, exceedinghumidity will not be displayed. Pump duty cycle.This is the duty cycle of the alternating current voltage that operates the pump. The pump dutycycle be adjusted between 10% and 100% (maximum power setting default) in 10% steps. Maximum ventilation time.The maximum ventilation time can be adjusted between 0 und 600 min. - the standard settingis 10 min. (high pressure sensor 300 min.). If this time is exceeded during ventilation, a"pressure loss error" is displayed. The value can be set on indefinite ("inactive" is displayed),then the error report is intermitted. The setting for indefinite („inactive“) is „0 min."FM GerätebauSeite 22 von 3608.02.16

LL DOC0302-R510.3 Humidity monitoringA sensor monitors the waveguide system humidity and temperature. If a limit is exceeded, any ongoingventilation process will be interrupted and it will not be allowed to restart until the humidity level dropsbeneath the limit setting. The pump will be switched off and the valve will be closed. However,regeneration can take place whilst this error exists. This error will be displayed via LED and an alarmcontact, and will be automatically reset, when the humidity level falls beneath the humidity limit settingonce again. However, it remains saved and can be polled from the error list.If the maximum ventilating time is set on "inactive", valve 0 will not be switched off when exceeding thethreshold.The dehydrator system might contain humid air on initial operation. Accordingly, humidity control isactivated only 120 sec. after switching the device on. Prior to that the value on the LCD display (dewpoint) is *. Prior to expiry of talarm / tpmax errors are not displayed or saved.If humidity exceeds hmax - h, regeneration is started (if possible). The constant Dh is a value of 10%.The threshold hmax can be set via serial interface on values between 2% and 99%. The default value is30%.10.4 Operational hours meterThe following hours are recorded:the total operational time of the devicethe total operational time of the pumpthe ventilating time of the waveguide systemThe meter readings are saved to EEProm (non-volatile memory) as soon as a full hour is reached. This6kind of storage can store only a limited number of write cycle times (10 ), so it is not possible to keep onsaving readings indefinitely. To keep the meter reading when the device is shut down it is possible tosave all readings from the control panel or via the serial interface (shut down).The ventilating time of the pump is recorded every second (the display is updated only every minute), thetotal operating time every minute.FM GerätebauSeite 23 von 3608.02.16

LL DOC0302-R510.5 Fault detectionFault indication takes place several times each second. The detected errors are shown by LED and withone exception on the alarm contact. (temporary over temperature). When an error occurs, it sets a bitcorresponding to the type of error in the non-volatile store. After switching off and on, the device can beoperated normally, provided the error does not reoccur. The error list remains as it is and can be queriedfrom the control panel or the serial interface. Errors can be reset via the serial interface.The following errors are recorded: RTC error:If the VL flag (voltage low) is set in the RTC status register on switchon, a RTC error is displayed. This means that the real time clock waswithout power supply, i.e date and time must be reset. This error maybe shown on inital operation. Humidity error:Indicates that the humidity limit setting has been exceeded. Prior toexpiry of talarm errors are not displayed or saved. Pressure loss:The maximum ventilating time has been exceeded. Prior to expiry oftalarm errors are not displaye

The dehydrator supplies dry air. This dry air is filled into transmission lines such as waveguides of radio link systems to prevent the occurrence of humidity and condensation. The dehydrator is designed for installation in ETSI standard cabinets, in 19” racks, and for wall or f