Jet Central Sequencer Plus

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Alexia Melton
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1 Jet Central Sequencer Plus Features The Jet Central Sequencer Plus is a multipurpose electronic device, the capabilities of the unit include: Three part sequencer, operating landing gear and two independent sets of doors Choice of three different sequence modes User selected operating times for all sequencing operations ATV settings for endpoints on all three outputs The unit is compatible with both servo and electronically operated valves fail - safe with user selectable cutoff point fail - safe with user selectable low voltage cutoff point Digital air pressure gauge and voltmeter down - lock safety feature prevents the gear from retracting if the radio is turned on with the switch in the retracted position Electronic output to operate landing lights when the landing gear have been extended Electronic output to trigger strobe light operation when the unit is powered up Display indicates visually whether the gear is in the retracted or extended position Installing the Unit Installation is straightforward, begin by plugging the unit in to the retract channel on the receiver Then plug the main gear into the uppermost set of pins and one or two sets of door servos or valves into their marked positions Observe the polarity marked on the case CAUTION: When connecting servos to the unit make sure that any linkages are not connected in order to reduce the chance of damage during programming due to possible over travel and stall situations If the installation requires the closing of some doors with the gear extended but leaving some doors open as well (as with the F-15, Rafale or T-45 for example), plug the doors that will close into door 1 position and the doors that will remain open into position 2 Connect the airline to your main air system Do not pull off the supplied tubing, as it will potentially damage the unit The use of an airline connector is recommended to connect the unit to the air system If landing lights or navigation lights are to be used, plug them into their respective slots, specifications for these outputs are listed in Light Outputs section Attach the unit (eg with Velcro) in a location where it may be easily accessed and removed for programming, make sure to leave enough servo wire and airline to allow easy access to the two programming push buttons in the lower right corner of the unit Power up the receiver and check to see that the display is operating, if you pressurize the system, you should see the numbers increment as pressure builds Synchronizing the Retract Switch Position on the Transmitter The switch position on the transmitter must be set to coincide with the sequencer indication of gear extended and gear retracted The transmitter ATV setting for the retract channel should be set to a typical value such as 100, please follow manufacturer s instructions for the brand of transmitter being used The sequencer will display for extended mode or display for retract mode, use the transmitter servo reverse setting as required to set the retract switch to the desired position, this is important in order for the sequencer s low air / voltage failsafe 1 to operate properly The finial servo travel and direction for each function ie gear position, door 1, and door 2 is set with the sequencer ATV settings Example using Futaba 12FG Transmitter: Retract Channel Set to Reverse Travel Set to 100% & 100% Measured Pulse Width: Retracted 1100 us Extended 1940 us Note 1: On early production units an input voltage greater than 58V will not allow sequencer to operate Caution: The use of a voltage regulator for the system power will not indicate the true battery charge condition and therefore the low voltage fail safe should not be depended upon for indication of low battery condition Page 1

2 Sequencing Modes During programming of the Sequencer Plus, you may choose one of three available operating modes, or sequences They are: Mode 1: Doors 1 and 2 open, landing gear extends, door 1 while door 2 remains open On retraction, door 1 opens, landing gear retracts and doors 1 and 2 both close Mode 2: Doors 1 and 2 open, landing gear extends, doors 1 and 2 remain open On retraction, the landing gear retracts, and doors 1 and 2 both close Mode 3: Doors 1 and 2 open, landing gear extends, and doors 1 and 2 close On retraction, doors 1 and 2 open, the landing gear retracts, doors 1 and 2 close Display During operation, the unit displays the air pressure as the default display As the display is limited to a maximum value of 99 therefore the display does not indicate actual pressure The following table is approximate values of pressure vs display readings: Imperial Units 10 psi 15 psi 20 psi 25 psi 30 psi 35 psi 40 psi 45 psi 50 psi psi 65 psi 70 psi 75 psi 80 psi 85 psi 90 psi 95 psi 100 psi psi 115 psi 120 psi 125 psi 130 psi 135 psi 140 psi 145 psi 150 psi Metric Units 5 bar 1 bar 15 bar 2 bar 25 bar 3 bar 35 bar 4 bar 45 bar bar 55 bar 6 bar 65 bar 7 bar 75 bar 8 bar 85 bar 9 bar bar 10 bar 105 bar 11 bar Voltage Indication When the display is in its normal air pressure reading mode depressing the + button changes the display momentarily to read the input voltage to the sequencer Page 2

3 Programming There are two push buttons marked + and - that are used for programming The menu is accessed by pressing the - button once Each additional push of the button moves through the menu in the following order: Note: The display consists of a two digit eight segment LED display; characters are created by illuminating various segments 1 - ATV for landing gear extended 2 - ATV for landing gear retracted 3 - ATV for door 1 open 4 - ATV for door 1 closed 5 - ATV for door 2 open 6 - ATV for door 2 closed 7 Access to Sequence time delays (See sub-menu below) 8 - Sequence mode 9 - Cutoff pressure (For pressure fail safe gear operation) 10 - Cutoff voltage for gear fail safe (For voltage fail safe gear operation) When 7 is selected, the following submenus are accessed in the following order: Sub extend landing gear Sub retract landing gear Sub open gear door 1 Sub close gear door 1 Sub open gear door 2 Sub close gear door 2 Page 3

Note: To reset the sequencer to factory defaults, depress either of the two buttons while turning the unit on Entering / Exiting Programming Mode As previously mentioned, the menus are stepped

of over two seconds is detected between button depressions then the menu will revert back to the pressure sensing mode To program a value for a particular menu item, hold the + button down for

4 Note: To reset the sequencer to factory defaults, depress either of the two buttons while turning the unit on Entering / Exiting Programming Mode As previously mentioned, the menus are stepped through in sequence by pressing the - button The advancing menu items are shown in the display with each successive push of the - button Note: Button pressing must be done rather quickly, if a pause of over two seconds is detected between button depressions then the menu will revert back to the pressure sensing mode To program a value for a particular menu item, hold the + button down for approximately two seconds, after which the value currently programmed for that menu item will be displayed, release the + button at that time, (if the button is not released it will start to increment the set value) The value may then be increased or decreased by 01 with each press of the - or + button When the desired value is reached, briefly depress both buttons simultaneously and the unit will store the value and exit programming mode and revert back to the pressure displaying mode The display will now return to its default mode and display air pressure Note: To repeat this important concept; after each parameter is stored the unit exits the program mode In order to program the next parameter the programming sequence must be repeated to gain access to the desired parameter For example, let s say you would like to set the sequence mode of the unit to Mode 3, opening and closing both doors after each retraction and extension cycle Start by pressing the - button eight times to reach the sequence mode menu item The display should show Ao Then press the + button and continue to hold the + button for a few seconds, the display will change to 01, indicating the unit is in mode 1 Press the + button twice and the display will now read 03, which is the sequence mode you would like to select for this example Depress both + & - buttons simultaneously and the unit will store the value 03 and return to operating mode displaying air pressure Setting Sequencer Mode The eighth item in the menu provides access to the sequencer mode selection, select either Mode 1, Mode 2 or Mode 3 based on the desired door operation This is accomplished as shown in the example above Setting ATV Values The first six selections on the menu are for setting the servo travel / endpoints and direction on the three independent outputs These outputs are,, and Page to the specific output setting as shown on page three by using the - button, as you reach the desired position release the - button and then press the + button for two seconds to enter the value entry menu Use the + and - buttons to set the endpoints of travel, they will change by 1 increments with each push of either the + or - button The use of a servo tester or pulse width indicator such as the Jet Central System Analyzer (Micro Hand Data Terminal) is highly recommended during the programming process which will help in determining the correct ATV settings This holds true for either servo operated valves or electronic operated valves to be used for the end application If an indicator/tester is not available then a servo can act as a programming aid to indicate the end points mechanically When using a servo please make sure that servo linkages are not connected in order to reduce the chance of damage during programming due to possible over travel and stall situations Page 4

5 If electronic valves are to be used it is recommended that they be setup in accordance with the manufactures instructions when connected directly to the receiver output channel for the retract function prior to connecting to the sequencer unit After the correct operation of the electronic valve is verified via the R/C system then it may be connected to the sequencer If using the a servo for the indication then it will move in real time as you change the value making it easy to visually select the range of travel If using a pulse indication device it will display the pulse width corresponding to the movement When you are finished programming the end point simultaneously press both + & - buttons to store the value Repeat this procedure for each of the six endpoints The servo direction is reversed by either increasing or decreasing the end point values for the individual output, The following example will detail setting the gear or door up (extended) and down (retracted) endpoints Select x for the (extended/open) or x for (retracted/closed) position where x = 1 for, 2 for Door #1 and 3 for Door #2 See table on below Note: The servo ATV settings in the following diagram are reversed from to the two door Servos ATV settings due to the mechanical layout of the servos Example: Setting of the ATV value for landing gear in the extended position, pressing the - button once will go to the Display as shown: Press the + button for two seconds to gain access to the ATV value, pressing the + or - button to get the desired ATV time (using a servo analyzer) or position if using a servo for the indication In the diagram above it was found that a value of 56 was required for the mechanical valve setting for gear extended Repeat the process to program Retracted and doors 1 & 2 in open and close positions following the steps above and the displays shown on page 3 and the table below: ATV Values for Mechanical Air Valves as per diagram above Function Setting / Pulse Width Extended 56 / 1950 us Retracted 31 / 1600 us 31 / 1600 us Closed 56 / 1950 us 31 / 1600 us Closed 56 / 1950 us Page 5

6 Servo Movement Desired Position Arm Travel rotated Clockwise Desired Position Arm Travel rotated Counter Clockwise Pulse Width Range 1500 us to 2000 us 1000 us to 1500 us Range 39 to to 39 Typical Display indications related to pulse width Display Pulse (us) Display Pulse (us) Note: The adjustable end point values on this sequencer range from 328 us to 2382 us, each 01 change on the display equals approximately 12 us of pulse width change The display range is from 00 to 99, in order to access the full travel range The display will have to be incremented through the 00 to 99 range twice This is why it is important not to have any linkages connected to the servo when setting up the ATV settings as the servo may move past the mechanical limits causing permanent damage to the servo Normal servo pulse signal ranges from 1000 us to 2000 us with 1500 us being the center of range When setting up the travel on a sliding type air valve it is best to have one end of the linkage connected to the valve and the other end loose above the servo arm so that the end points may be verified prior to the final linkage connection Typical ATV Values for Electronic Air Valves Function Setting / Pulse Width Extended 03 / 1950 us Retracted 74 / 1050 us 03 / 1950 us Closed 74 / 1050 us 03 / 1950 us Closed 74 / 1050 us Page 6

7 Programming Time Sequences The seventh item in the menu provides access to a submenu that controls the variable time settings between each event in a sequence The display will show for this menu selection The submenu is accessed by holding down the + key for a few seconds after releasing the - key as before The six parameters in the submenu (see page 3) are cycled by pressing the - button, in a similar fashion to the main menu items Holding the + button for a few seconds after releasing the - button at the selected submenu item will display the value currently stored in the unit for that particular parameter As with air pressure, the values in the display do not represent seconds Each 01 unit on the display represents 1/3 of a second For example if you wish to enter a time of 4 seconds, the value you select should be 12 0 Sec 1/3 Sec 2/3 Sec 1 Sec 2 Sec 3 Sec 4 Sec 5 Sec 6 Sec 7 Sec 8 Sec 9 Sec 10 Sec The last thing to understand about programming the time settings is that they represent the time between events in a sequence mode Mode 1 retraction event is as follows: Command for gear retraction, Event 1 Doors (2A Time applied), Event 2 opens (3A Time applied), Event 3 retracts (10 Time applied), Event 4 (30 Time applied), Event 5 (20 Time applied) In the sequence described above the command for gear retraction (flipping the transmitter retract switch) will result in an immediate opening of (Event 1), and then the time delay that was entered for the open sequence will be used to delay the opening of (Event 2), then the sum of the time delays that were entered for the and open sequence will be applied to delay the retraction of the gear (Event 3) Note: In the case of Mode 1 is already open so the total delay for the retraction is only the value entered for Continuing on from event 3, the time delay that was entered for the retract sequence will be applied to the trigger the closing of (Event 4), and finally the time delay that was entered for the Closing of door 2 will be applied to trigger (Event 5) Formula View: Event 1 + Event 2 = Total time for Event 3 to occur ( retraction) Event 3 + Event 4 = Total time for Event 5 to occur ( Closure) Hint: If you are not using Door #2 output you may choose to set program parameters 30 and 3A to 00, as any time delay programmed in these delays will be added to the delay times, by doing this you would need to set your total delay in the door 1 parameters Mode 1 timing sequence shown in table form: Mode 1 Event 1 Event 2 Event 3 Event 4 Event 5 Switch to Retract No delay s Time seconds Already in Mode 1 Time No delay applied retracts Time seconds Time seconds Mode 1 Event 1 Event 2 Event 3 Event 4 Event 5 Switch to Extend No delay s Time seconds Already in Mode 1 Time No delay applied Extends Time seconds Remains N/A

8 For example, if you are programming a Mode 1 sequence where both doors open quickly, the gear retracts or extends after a delay of 2 seconds, and then door 1 quickly; the selected values would be entered as shown in the example Mode 1 table below Sample Mode 1 Table: Mode 1 Command to Extend opens 2 seconds 06 opens 2 seconds 06 Extends Extend Remains N/A (Sum of & ) 4 seconds N/A 2 seconds 06 N/A N/A N/A 1/3 second 01 Mode 1 Command to Retract opens 2 seconds Already Set Above s 2 seconds Already Set Above N/A (Sum of & ) 4 seconds N/A 2 seconds 06 1 second 03 N/A (Sum of & ) 3 seconds N/A N/A N/A As before, each time you select a value, depress both buttons simultaneously to save the value Programming the sequencer becomes a little easier if you map out the values in a table before you begin programming Blank tables have been provided on the following page to copy and use for this purpose The methods described above for Mode 1 apply for Modes 2 & 3 Note: The unit remembers the last position it was in when powering down It is important not to turn off power to the receiver until the display indicates that the full sequence has completed and the air pressure in the system is once again displayed Page 8

9 Mode 1: Doors 1 and 2 open, landing gear extends, door 1 while door 2 remains open On retraction, door 1 opens, landing gear retracts and doors 1 and 2 both close Blank Mode 1 Table: Mode 1 Command to Extend opens opens Sum of & Extends Extend Remains N/A N/A N/A Mode 1 Command to Retract opens Already Set Above s Already Set Above Sum of & Sum of & N/A N/A Page 9

10 Mode 2: Doors 1 and 2 open, landing gear extends, doors 1 and 2 remain open On retraction, the landing gear retracts, and doors 1 and 2 both close Blank Mode 2 Table: Mode 2 Command to Extend opens opens Sum of & Extends Extend Remains N/A N/A N/A Remains N/A N/A N/A Mode 2 Already Already Command to Retract N/A N/A N/A N/A On Command Sum of & N/A N/A Page 10

11 Mode 3: Doors 1 and 2 open, landing gear extends, and doors 1 and 2 close On retraction, doors 1 and 2 open, the landing gear retracts, doors 1 and 2 close Blank Mode 3 Table: Mode 3 Command to Extend s s Sum of & Extends Extend Sum of & N/A N/A N/A Mode 3 Command to Retract s Already Set Above s Already Set Above Sum of & Sum of & N/A N/A N/A Page 11

Setting the Air Fail Safe Value The ninth menu item is the air fail safe parameter, identified by in the display After pressing the - button nine times enter programming mode as before by holding the

50 psi (3,5 Bar) would be a value of 29 Depress both + & - buttons to save and exit programming mode Pressurize your air system above the fail safe set point pressure Test the system by retracting

happens during a pressure fail safe operation, the gear was set to the retracted position via the transmitter( displayed), the failsafe value was set to 29 in the example programming step (ie

12 Setting the Air Fail Safe Value The ninth menu item is the air fail safe parameter, identified by in the display After pressing the - button nine times enter programming mode as before by holding the + button for two seconds after releasing the - button The typical fail safe pressure trip point is between 50 and 60 psi, using the + or - buttons, set the value from the table on page 2, for example 50 psi (3,5 Bar) would be a value of 29 Depress both + & - buttons to save and exit programming mode Pressurize your air system above the fail safe set point pressure Test the system by retracting the gear, and then gradually bleeding off air pressure, as the value on the display falls below the fail safe value that was entered, the gear should extend The following photos illustrates what happens during a pressure fail safe operation, the gear was set to the retracted position via the transmitter( displayed), the failsafe value was set to 29 in the example programming step (ie approximately 50 PSI), the failsafe triggered as air pressure was released (the AA display in the second photo) and commended a gear down as denoted by the 1952 us pulse width as shown in the third photo, the display reverted back to it default of reading air pressure in the third photo after a couple of seconds, the transmitter switch remained in the gear up position Setting the Voltage Fail Safe Value The tenth menu item is the voltage fail safe parameter, identified by in the display After pressing the - button ten times enter programming mode as before by holding the + button for two seconds after releasing the - button Set the low voltage cut off value that you want to activate gear extension Depress both + & - buttons to save and exit programming mode Caution: Input voltage is sensed through the receiver connection, if a voltage regulator is used for the system power then the sequencer will not indicate the true battery charge condition and therefore the low voltage fail safe should not be depended upon for indication of low battery condition Light Outputs The strobe light output is set for a 50/50 duty cycle and switches between 0 volts and the applied input voltage, the maximum current drive is xx ma The landing light output switches between 0 volts and the applied input voltage with the gear extended, the maximum current drive is xx ma Congratulations and enjoy your purchase Should you experience problems with the unit, please contact Jet Central for assistance Page 12

TOP SERVO SIGNAL 5 SERVO SIGNAL 3 SERVO SIGNAL 4 SERVO SIGNAL 6 T B T B T B T B T B SERVO TRIGGER 1 BOTTOM

TOP SERVO SIGNAL 5 SERVO SIGNAL 3 SERVO SIGNAL 4 SERVO SIGNAL 6 T B T B T B T B T B SERVO TRIGGER 1 BOTTOM Micro Miniatures Servo Controller Channel Location of connections and switches TOP SERVO SIGNAL SERVO SIGNAL 7 SERVO SIGNAL 6 SERVO SIGNAL 5 SERVO SIGNAL SERVO SIGNAL SERVO SIGNAL SERVO SIGNAL SIGNAL COMMON