PET2+ Rev 1-2 manual format
Contents
1. If the altimeter fails this test you will receive the error codes as outlined in the Modes of Operation section NOTE Operating the unit in temperature extremes may cause the unit to drift outside of nominal calibration limits and induce an Error Condition Piezo Tone This setpoint controls the tone of the Piezo This feature is useful when running multiple audible avioincs or it s difficult to hear the standard 4KHz tone 1 4KHz tone high tone 2 4KHz and 1250Hz DTMF tone low tone Diagnostic Options Input Test Mode This feature allows the user to verify the operation of the continuity input circuits It operates identical to launch detect mode Chriping Flashing is as follows Long Beep Flash No continuity on Event 1 or Event 2 1 Short Beep Continuity on Event 1 only 2 Short Beeps Continuity on Event 2 only 3 Short Beeps Continuity on Event 1 and Event 2 Output Test Mode This feature allows the user to manually activate the Event1 and Event 2 circuits When this diagnostic is selected the piezo will emit a WARNING TONE for 5 seconds and the LED will flash rapidly in RED to alert the user that output test mode has been selected After the warning tone is complete the unit is ARMED Press the SELECT pushbutton to activate the EVENT1 output Press the ENTER pushbutton to activate the EVENT2 output Note A useful accessory for testing the outputs are 12 volt DC panel lamps The lamps will allow you to observe the operation of the out2. load test a 9V battery you will require a DC multimeter capable of DC amp measurement with a 10 amp capability A 9 volt alkaline battery can easily source in excess of 5 amps Briefly connect the meter leads across the battery terminals to measure the DC current capacity If the measurement is close to or drops below 2 amps do not use the battery Nominal load during operation is about 6 ma and during output firing the unit can draw well over 1 amp with low current e matches Wiring Diagram Low Current e matches Figure 3 depicts the recommended low current wiring convention for PET2 This configuration activates the e matches using the same battery that powers the microcontroller and accelerometer system The success of this configuration relies on the voltage remaining relatively stable when firing a low current e match If the voltage sags too low this may result in a brown out or other timing operation malfunction Pg 4 Figure 3 Low Current Wiring Diagram for the PET2 Battery Event 2 e match 7 I 1 caved fa Sole Rl S le fl Poa YE O Ari wu a at a ty ee ree Fi O rer S Power Switch T S U o lt i O an CS Q amp D o Boe olle go OTOL 4 Event 1 e match Wiring Diagram High Current Dual Battery Figure 4 depicts the recommended high current dual battery wiring convention for the PET2 When your timing system pyro charges do indeed require higher current
3. sec 2 Slow 1 sec 3 XSlow 2 sec 1 0 1 3 0 seconds 1 to 30 1 One shot 2 Repeat Range 1 X Axis 2 Y Axis 3 Z Axis 4 Auto Axis 1 10 5 Represents 20 degrees 1 High Tone 2 Low Tone N A N A Default value 4 5 Pg 7 Figure 5 Mounting Dimensions for the PET2 TOP VIEW lt _ 2 hole centers 0 125 dia gt F ros Aa 0 8 r ja 3 3 es k Ae ra HH 4 Pi O d gt in e ES ER RA E it 1 1 l Mg c m a a OW OW 0 real 1 iE END VIEW Operating Tips for Success Always pre test your PET2 as COMPLETELY as possible prior to every flight This includes a test of the inputs outputs and Breakwire system Always pre test your batteries before each flight and ensure they have adequate power capacity for the anticipated worst case flight profile including unplanned on the pad waiting time Always pre measure your deployment charge initiators Measure them for a nominal resistance and verify they are not shorted Double check your timing configuration and your anticipated flight profile to ensure you ll reach adequate acceleration levels to properly trigger and initiate your timing sequences Be sure to familiarize yourself with the audible feedback operations of the PET2 in particular its Error Code and Continuity chirping sequences The unit will not arm itself in an Error condition and launching y
4. 1st trigger event that occurs upon ignition of the rocket s main engine or first stage when acceleration meets exceeds the timer s MEIG setpoint 2 5 G s MECO Main Engine Cut Off This is 2nd trigger event that occurs upon burnout or cut off of the rocket s main engine when acceleration falls below the 1G calibration point SEIG Second Engine IGnition This is the 3rd trigger event that occurs upon ignition of the rocket s second engine or second stage when acceleration meets exceeds the timers SEIG setpoint 2 5 G s SECO Second Engine Cut Off This is 4th trigger event that occurs upon burnout or cut off of the rocket s second engine when acceleration falls below the 1G calibration point Timer 1 Timer 2 Setpoint Menu Options MEIG Trigger Level Inertial acceleration trigger setpoint for the MEIG event It is adjustable between 2G s and 5G s of acceleration represented by a value of 2 to 5 Must be set for MECO SEIG SECO triggers SEIG Trigger Level Inertial acceleration trigger setpoint for the SEIG event It is adjustable between 2G s and 5G s of acceleration represented by a value of 2 to 5 Trigger Event Defines the inertial trigger event used to trigger the timer It is adjustable between 1 and 4 as follows 1 MEIG trigger 2 MECO trigger 3 SEIG trigger 4 SECO trigger Trigger Integration Time Defines the amount of time that the inertial trigger level must be sustained for a valid trigge
5. Figure 6 Menu Navigation and Operation Flowchart Invoking the Start Menu Press amp Hold Power up Wait for Release Start Menu Select PB altimeter chirp Select PB activated Menu Navigation No No LED shows Start choice Select PB Enter PB Yes Yes Take this menu choice Next menu choice Modifying a Setpoint LED shows Start setpoint ID No Select PB gt Enter PB H Next setpoint ID Yes Chirp Flash Setpoint N Select PB Yes N Enter PB Yes Tap in new value with Select PB Tap Enter PB when complete Product Warranty Missile Works Corporation has exercised reasonable care in the design and manufacture of this product and warrants the original purchaser that the PET2 is free of defects and that it will operate at a satisfactory level of performance for a period of one year from the original date of purchase If the system fails to operate as specified then return the unit or units within the warranty period for repair or replacement at our discretion The system must be returned by the original purchaser and be free of modification or any other physical damage which renders the system inoperable Upon repair of replacement of the unit Missile Works Corporation will return the unit postage paid to the original purchaser Product Disclaimer and Limit of Liability Because the use and application of this equipment are beyond our control the purchaser or user ag
6. c Booster separation via PET2 Timer 1 MECO trigger 0 1 sec Sustainer ignition via PET2 Timer 2 MECO trigger 1 0 sec FEPFF EEE p lt Fe lt gt ae Pata aaa al TEE PETZ yk Se Mies LEGEND Motor Timer Charge Chute Altimeter Pg 6 Setpoint Menu Navigation and Setpoint Adjustment To scroll to the next available setpoint choice in the menu tap the SELECT pushbutton To choose a setpoint tap the ENTER pushbutton After a setpoint has been chosen the piezo and LED will repeatedly flash chirp the current value of the setpoint for verification Tap the SELECT pushbutton to scroll to the next setpoint in the menu OR tap the ENTER pushbutton to modify the chosen setpoint value If you ve elected to modify a setpoint the unit is now awaiting the new setpoint value Tap the SELECT pushbutton according to the newly desired value example tap the button 10 times for a value of TEN then tap ENTER when complete Alternatively tapping ENTER without making any new input will reset the setpoint value to its default value The unit will now chirp back the newly entered setpoint value Tap the SELECT pushbutton to scroll to the next available set point or repeat the programming operation by tapping ENTER again Setpoint Nomenclature The timer uses the following acronyms to define specific flight events that are used for timer triggering These acronyms are defined as follows MEIG Main Engine IGnition This is the
7. ch detect mode The piezo and the GREEN LED indicate the continuity status of the Event 1 and Event 2 output terminals every second as follows Status Code Status Condition 1 Long Beep Flash No continuity on Event1 or Event 2 outputs 1 Short Beep Flash Continuity on Event 1 output only 2 Short Beeps Flashes Continuity on Event 2 output only 3 Short Beeps Flashes Continuity on both Event 1 and Event 2 outputs The unit also monitors the accelerometer and or Breakwire input in order to determine the launch of the rocket After this event the unit transitions into timing operation mode Timing operation mode When in Timing Operation mode the LED flashes fast in RED 6Hz The unit can have one or both timers active at any given time based upon the triggering and timing configuration This mode of operation remains active until both of the timers have completed a timing cycle and the associated output event has been initiated Once this occurs the unit transitions into Post Timing mode Post Timing Mode When in Post Timing Mode the LED will flash slowly in YELLOW 2Hz The unit will continue in this mode until it is powered off Keep in mind that if either timer has been configured in repeat mode the repeat timing cycles are active during this mode Programming and Configuration Accessing the Start Menu Please refer to the Setpoint and Operations Matrix reference included in this manual when reading and reviewing this section Also refe
8. f the PET2 Programmable Event Timer Figure 1 General component layout of the PET2 Battery LED MCU Piezo Enter PB Event 2 Output o S a a 26 E Y Breakwire Input Accelerometer Select PB Event 1 Output All user input and output connections are made to the compression terminals as shown These terminals include Battery logic and or pyro power Breakwire for a N C wire loop or switch and Event1 Event2 for external pyro events or controls All terminals are marked on the board silkscreen for reference Note Before using the PET2 familiarize yourself with the location and designation of all the user connection terminals pushbutton controls and with the audible feedback and LED functions These functions operations and connections are covered in subsequent sections of this manual Pg 1 Pre Flight In Flight Post Flight Modes of Operation The PET2 has several distinct modes throughout the course of its operation during flight These modes of operation are easily identified by the function of the piezo and the LED Power up mode When power is first applied to the unit it will provide a continuous 2 second chirp to indicate it has been switched on During this 2 second chirp the LED will be solid RED Accelerometer initialization mode After the Power up mode the unit goes through a 10 second accelerometer initialization start up delay The LED will flash slowly in YELLOW while
9. iagnostics Menu From this menu you can access the PET2 global setpoints The unit can also be placed into various modes to verify the basic operational integrity of the unit including the continuity circuits and output controls Global Setpoints and Diagnostics Menu Navigation To scroll to the next available setpoint or diagnostic choice in the menu tap the SELECT pushbutton To choose a setpoint or diagnostic tap the ENTER pushbutton The piezo and LED will flash chirp the appropriate setpoint value or based upon the type of diagnostic chosen Tap the SELECT pushbutton to scroll to the next setpoint in the menu The Input and Output test dead end and require a restart of the unit when you re completed Global Setpoints Menu Options Inertial Trigger Axis Determines the timer orientation and accelerometer axis to be used for Inertial triggering This setpoint applies to both timers The Trigger Axis setpoint is adjustable between 1 and 4 as follows X axis trigger 2 Y axis trigger 3 Z axis trigger 4 Auto Detect axis X Y or Z Pg 3 Global Setpoints Menu Options continued Off Axis Cal Deviation This setpoint allows you to specify a deviation deadband to ensure the rocket is within 20 degress of vertical for launch operations and to ensure the accelerometer calibration has not drifted in excess from the initial calibration process The valid range is from 1 to 10 with a value of 5 representing 20 degrees range
10. in this mode This delay period allows stabilization of the device and establishes the initial orientation and inertial references POST Power Up Self Test Verification Error Chirp Mode The PET2 performs several sanity checks after initialization mode based on its current configuration to ensure that the rocket and timer are oriented properly and within allowable launch angle and calibration limits If using the Breakwire trigger this input is also checked for a proper closed loop condition If the unit detects no problems no mis orientation and no mis configuration it will arm both of the event timers and transition immediately into Launch Detect Mode If the PET2 detects an error during Verification Mode it will NOT transition into Launch Detect mode Instead it will sound an alarm tone buzz and continuously chirp and flash YELLOW with an ERROR CODE to indicate what specific error condition was detected DO NOT MISTAKE AN ERROR CODE CONDITION for flight readiness and valid continuity feedback and inadvertently launch your rocket The error codes are as follows Error Code Error Condition 1 X axis triggering and off axis or off cal limit 2 Y axis triggering and off axis or off cal limit 3 Z axis triggering and off axis or off cal limit 4 Auto axis detection and no valid axis orientation detected 5 Breakwire triggering with initial open circuit Launch Detect mode When all previous modes are complete the unit transitions into laun
11. is capability allows mission specific timer orientation in the rocket Each timer is fully independent providing extremely flexible solutions for any rocketry timing application Just some of the applications that can be achieved with the PET2 timer include Precise booster separation and sustainer ignition of multi stage composite powered rockets Ignition of secondary composite motors after primary motor ignition for airstarted boosts Fail safe backup and redundancy of primary rocket recovery control systems Triggering a camera shutter audible visual tracking device or other electrical device at various stages of flight General Specifications Arming Mode Inertial Breakwire Dimensions 1 W x 3 15 L Inertial G trigger range 2 5 G s Output current sinking 5A 0 5 sec Battery Power range 6 14 VDC Continuity current Qua 9V Nominal Battery load 6 14ma Weight 17 grams Handling Precautions Always handle in a properly grounded environment ESD damage is not covered under your warranty Never touch handle the unit when it is armed and connected to live pyrotechnic charges W Always allow the unit to adjust to ambient temperature prior to arming flying and avoid extreme temps Never arm the timer and then load your rocket onto the launch rail Arm the timer once on the rail Always prepare your rocket and timer system components with the unit powered off Physical Overview Figure 1 depicts the general component layout o
12. nd Operations Matrix LED Legend SOLID X LED Color R RED G GREEN Y YELLOW Start Menu Navigate to Timer 1 Setpoint Menu Navigate to Timer 2 Setpoint Menu SLOW FLASH FAST FLASH oP te Navigate to Global Setpoints and Diagnostics Menu Exit to Flight Mode Timer 1 Setpoint Menu FOOSE HOO MEIG Trigger Level SEIG Trigger Level Inertial Trigger Event Trigger Integration Time Breakwire Function Timer Interval Time Base Output Pulse Timer Operation Exit to Start Menu Timer 2 Setpoint Menu ROOST HOOO MEIG Trigger Level SEIG Trigger Level Inertial Trigger Event Trigger Integration Time Breakwire Function Timer Interval Time Base Output Pulse Timer Operation Exit to Start Menu Global Setpoint and Diagnostic Menu bo Inertial Trigger Axis Off Axis Cal Deviation Piezo Tone Output Test Mode Input Test Mode Exit to Start Menu Range 2 5 G s 2 5 G s 1 MEIG 2 MECO 3 SEIG 4 SECO 0 1 3 0 seconds 1 to 30 1 N A 2 Exclusive Trigger 3 Interlock Trigger 1 100 Time base dependent FLICKER FLASH Default value 2 1 Fast 0 1 sec 2 Slow 1 sec 3 XSlow 2 sec 1 0 1 3 0 seconds 1 to 30 1 One shot 2 Repeat Range 2 5 G s 2 5 G s 1 MEIG 2 MECO 3 SEIG 4 SECO 0 1 3 0 seconds 1 to 30 1 N A 2 Exclusive Trigger 3 Interlock Trigger 1 100 Time base dependent Default value 2 1 Fast 0 1
13. or if you want to configure the most robust and reliable configuration use the dual battery configuration as shown Ensure that the negative sides of each battery are connected together to form a single common Observe the proper output terminal connections using the leg of the Event 1 and Event 2 outputs IMPORTANT Never exceed 20VDC for the secondary pyro battery to avoid damaging the PET2 Figure 4 High Current Wiring Diagram for the PET2 Pyro Battery Pyro Switch Event 2 e match Power Switch ew Event 1 e match The unit has silkscreen labeling showing the designation of all the terminals and the associated polarity for each terminal where applicable Stranded 20 22 AWG wire is recommended for the battery and power switch terminals Breakwire Circuit and Operation When using the Breakwire circuit always use a dry contact connection between the and terminals The Breakwire circuit uses the BATTERY VOLTAGE to operate The PET2 uses the Breakwire circuit for trigger operation by detecting when the circuit is OPEN When used in your timer triggering scheme the Breakwire circuit must be CLOSED initially on the pad when the PET2 is initialized and subsequently open via some other external event or operation The Breakwire circuit and the ENTER Pushbutton operate in parallel to one another a closed Breakwire circuit can be simulated by pressing the Enter button Mounting Considera
14. our rocket will result in a failure of the timing operations of your flight Likewise ignoring the validity of continuity feedback may produce a failed timing event Flying in extreme hot or cold temperatures may cause drift of the inertial sensor such that an Error Code condition may exist due to this drift exceeding the nominal inertial calibrations stored in the MCU EEPROM If this condition exists you can widen the deadband setpoint value Off Axis Cal Deviation in order to satisfy the POST verification mode Example Usage of the PET2 Basic 2 Stage Rocket Advanced 2 Stage Rocket Advanced 2 Stage Airstart Rocket Booster ignition via ground launch system Booster separation via PET2 Timer 1 MECO trigger 0 1 sec Sustainer ignition via PET2 Timer 2 MECO trigger 1 0 sec Booster recovery by engine ejection Sustainer recovery by Avionics L NE A PET2 Eoo Booster ignition via ground launch system Booster separation via PET2 Timer 1 MECO trigger 0 1 sec Booster recovery via PET2 Timer 2 MECO trigger 3 0 sec Sustainer ignition via PET2 Timer 1 MECO trigger 1 0 sec Sustainer recovery by avionics Timer 2 backup SECO X seconds Woi lt gt gt i RML EEL PET E gt p LEZ Booster ignition via ground launch system Airstart Ignition via PET2 Timer 1 MEIG trigger 2 0 sec Booster recovery via PET2 Timer 2 MECO trigger 3 0 se
15. puts without the use of pyrotechnic devices IMPORTANT Always exercise caution if using live pyro charges in the output test mode Escape to Start Menu Exit the Diagnostics Menu and return to the Start Menu IMPORTANT After selecting the Input Output Test Mode diagnostic feature you must power off the unit prior to flight additional testing or usage of the altimeter Accelerometer Orientation The PET2 can be flown in any one of three orientations for inertial triggering This flexibility allows the designer to utilize the rocket payload space in more effective manner as opposed to the single axis axial orientation required by other timer systems The Figure 2 diagram illustrates these orientations in reference to the airframe nose cone Figure 2 X Y Z orientation of the PET2 Battery and Power Source Considerations The PET2 is intended to be operated using a standard 9 volt alkaline battery however because of it s wide voltage input range battery packs from 6V to 14V are compatible IMPORTANT Always use a battery system less than 14 Volts to avoid damaging the PET2 IMPORTANT Always load test your battery prior to flight to ensure adequate power reserve for reliable operation and ignition of the ejection charges Inadequate sizing of an external battery system or high current demands on the battery system during event initiation may lead to power and processor brown out conditions resulting in recovery failure To
16. r event This time is adjustable between 0 1 seconds to 3 0 seconds 0 1 sec increments a value of 1 to 30 The timer applies to both inertial and Breakwire inputs Breakwire Function Defines the trigger operation of the Breakwire input There are 3 valid setpoint options 1 N A Not Applicable Breakwire input is not used 2 Exclusive Trigger Timer is triggered exclusively by Breakwire input no inertial trigger 3 Interlock Trigger Breakwire AND Inertial trigger are interlocked both must be valid Timer Interval The timer value 1 100 used in conjunction with one of three specific time base setpoints Time Base The timer time base value defining the programmable Timer Interval and resolution of the timer 1 Fast 0 1 seconds 0 1 to 10 0 seconds 2 Slow 1 0 seconds 1 to 100 seconds 3 Extra Slow 2 0 seconds 2 to 200 seconds Output Pulse Determines the amount of time the output event is energized when the timer countdown is compete This time is adjustable between 0 1 seconds to 3 0 seconds 0 1 sec increments a value of 1 to 30 Timer Operation This setpoint defines if the timer operates as a one shot event or in a repeat mode operation 1 One Shot operation 2 Repeat operation NOTE All setpoints can be initialized to Factory Defaults by pressing both pushbuttons and performing a power up The unit quickly chirps and flashes the LED Release both pushbuttons to complete the reset Global Setpoints and D
17. r to the Figure 6 Menu Navigation and Operation Flowchart for additional help To start the interactive operation of the PET2 press and hold the SELECT pushbutton while applying power to the unit Re lease the pushbutton after you hear a brief chirp from the piezo You re now at the Start Menu and displaying the first choice SLOW FLASHING RED Setpoint Menu Start Menu Navigation To scroll to the next available choice in the menu tap the SELECT pushbutton To make a choice in this menu tap the ENTER pushbutton note a brief chirp acknowledges each button press Start Menu Options All other menus are accessed from the Start Menu The available options are Timer 1 Setpoint Menu Provides verification and adjustment of all user setpoints for Timer 1 Timer 2 Setpoint Menu Provides verification and adjustment of all user setpoints for Timer 2 Global Setpoints amp Diags Menu Verify Adjust the PET2 global setpoints or exercise the PET2 diagnostic features Escape to Flight Mode Exit the Start Menu and return to normal flight operations mode Timer 1 Timer 2 Global Setpoint Menus All user adjustable setpoints are available from these menus You can verify all setpoints and you can adjust all setpoints The PET2 provides 2 independent and identical groups of setpoints for each timer The Global Setpoints are applied and used by both timers appropriately All setpoint values are stored in nonvolatile memory Pg 2 Setpoint a
18. rees to hold harmless Missile Works Corporation and their agents from any and all claims demands actions debts liabilities judgments costs and attorney fees arising out of claimed on account of or in any manner predicated upon loss or damage to property of or injuries to or the death of any and all persons arising out of the use this equipment Due to the nature of electronic devices and the application and environments for those devices the possibility of failure can never be totally ruled out Itis the responsibility of the purchaser or user of this equipment to properly test and simulate the actual conditions under which the device is intended to be used to ensure the highest degree of reliability and success Missile Works Corporation Tel 303 823 9222 Fax 303 823 9777 PO Box 1725 On the World Wide Web www missileworks com Lyons CO 80540 Copyright 2000 2010 by Missile Works Corporation All rights reserved Pg 8 User Manual and Instructions Model PET2 Programmable Event Timer Revision 1 12 System Overview The PET2 provides a highly advanced and versatile dual event timing control system targeted for high power rocketry The design of the PET2 utilizes a RISC microcontroller with a precise internal factory calibrated 4MHz system clock for accurate and reliable event timing control In addition the PET2 uses a 3 axis micromachined accelerometer to detect specific inertial events during flight This 3 ax
19. tions The payload section or electronics bay used for the PET2 should be sealed to isolate the electronics from the ejection charge or engine heat and residue IMPORTANT Inadequate sealing of the electronics bay or exposure of the electronics to ejection charge heat BP resi due or pressure will cause the PET2 to malfunction IMPORTANT Black powder residue is extremely corrosive to the circuit board and its components Always clean off any inadvertent residue immediately to avoid long term damage to the unit Physical Mounting Dimensions Figure 5 depicts the physical mounting requirements for the PET2 4 40 screw hardware is recommended to mount the unit into the payload section of the rocket or through a rocket airframe Nylon standoffs or insulated neoprene washers are also recom mended for mounting against a hard back plate or sled When designing your airframe avioincs bay and mounting the PET2 ensure that it is oriented in one of the three allowable orientations as depicted in Figure 2 Pg 5
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