Doccol PID Temperature Controller* Model WS1500B User`s
Contents
1. _ Key press to decrease displayed value Time Key press to change the Parameter Window s display between current timer and temperature values Mode indicator the small dot if it is lit and flashing the value displayed in the Parameter Window is time else it is temperature Patent pending Doccol PID Temperature Controller Model WS1500B 8 Timer status indicator In normal mode when 8 is on and 7 is flashing LED shows the time passed since the controller has been powered on When it is off the LED shows the current temperature detected by the sensor probe Doccol TPID Temperature Controller Sensor Fig 2 Back panel 2 Setting the temperature Press SET key twice both 2 and 7 will start to flash The LED shows the current temperature setting Use and keys to change the setting When finished press the SET again to confirm the change Note the temperature setting will not be changed if SET is not pressed confirmed The display will return to the normal display mode if no key is pressed within 3 seconds 3 Switching the display between temperature and time This is done by pressing the Time Key 6 once When 8 is on lit and 7 is flashing at the same time LED is in timer mode and shows the actual time passed since the controller was last powered on When 8 is off not lit LED is in temperature mode and shows th2. This warranty gives you specific legal rights and you may also have other rights that vary from state to state or province to province Important Carefully pack item to avoid damage in shipping Be sure to include proof of purchase date and to attach a tag to item before packing with your name complete address and phone number with a note giving purchase information model number and what you believe is the problem with the item We rec ommend you insure the package as damage in shipping is not covered by your warranty Mark the out side of your package ATTENTION CUSTOMER SERVICE We are constantly striving to improve our products and therefore the specifications contained herein are subject to change without notice Patent pending
3. Doccol PID Temperature Controller Model WS1500B User s Manual Version 1 0 Doccol Corporation 1235 E Pennsylvania Ave Redlands CA 92374 Tel 888 481 0842 Fax 888 893 5285 www doccol com July 2008 Introduction Thank you for purchasing the Doccol WS series temperature controller We sincerely appreciate your de cision and trust that our machine will meet your expectations in both the quality of the result and the value of our product While we are delighted that you may be anxious to operate the controller for your project a few minutes of your time reading through this manual will only serve to enhance your experience in the months and years ahead In particular we would urge you to read through the safety warnings below Al though this plug and play controller is very easy to operate your safety is paramount SAFETY WARNINGS This controller was designed to be used only with selected heating devices that have limited power and their own thermal cut off protection such as a thermostat or thermal fuse in case of controller failure Do not use it with an untested device Do not place any objects on the top of controller surface that is used to vent excess heat during its operation The maximum electric current this controller can handle is 15 ampere For 120 volt AC in US and Canada this limits the heater power to1800 watts Always affix the sensor on the heating pad when the controller is on Before turning on the control
4. e current sensor temperature 4 Setting the timer Press SET key once and release it both 7 and 8 will start flashing The LED shows the current timer setting Use and keys to change the timer setting When finished press the SET again to confirm the change Note the timer setting will not be changed if SET is not pressed confirmed The display will return to the normal display mode if no key is pressed within 3 seconds Patent pending Doccol PID Temperature Controller Model WS1500B 5 Using the timer The timer can be used in two different ways a Use it as timer If you set the timer for 20 hours the controller will stop sending power to the heater 20 hours after it is powered up It will display End on the window and send an audio beeping sound Turning off the power and on again will reset the timer 6 Tuning the controller This controller is shipped with parameters set for in vivo small animal surgery temperature set at 35 C The only thing that you need to do is to set your desired surface temperature for the heating pad 6 1 Auto Tune The controller s most powerful feature is its ability to regulate virtually any heater with stable temperature control For stable temperature control the controller requires two things 1 the controller must be set to the correct power level see next section and 2 that it must be tuned to the heater being used Tuning is the process that matche
5. g value Use and keys to change the setting When finished press the SET again to confirm the change The display will show the I for a second and its setting value next use the same P setting procedure to set the value When finished press the SET again to confirm the change The display will show the d for a second and its value next Use the same P setting procedure to set the d value When finished press the SET again to confirm the change The next setting is FAT the auto tune Use to set the value to 1 and press SET will activate the auto tune The next setting is the t setting use remain 2 for most application After change the PID parameter the controller needs to be turned off and on again for the best result and to set the cycle time value This value should 7 Setting other system parameters Patent pending These are the parameters that normally do not need to be changed The lock code to access them is 155 Fig 4 Description of parameters Doccol PID Temperature Controller Model WS1500B 5E calibration offset The parameter is used to make the input offset to compensate the error produced by sensor For example if the temper ature displays 2 0 C in ice water mixture set 5E 2 0 will make the display to shown 0 0 de gree c wt Output power reduction It is expressed as a percentage value This function will allow you to control the maxim
6. is warranted for 90 days This warranty is subject to the following conditions If the appliance is found to be defective in material or workmanship by Doccol Corporation we will repair or replace it free of charge A dated proof of purchase may be required Doccol Corporation s liability is limited solely to the cost of the repair or replacement of the unit at our dis cretion This warranty does not cover normal wear of parts and does not apply to any unit that has been tampered with or used for commercial purposes This limited warranty does not cover damage caused by misuse abuse negligent handling or damage due to faulty packaging or mishandling in transit This war ranty does not cover damage or defects caused by or resulting from damages from shipping or repairs service or alterations to the product or any of its parts which have been performed by a repairperson or facility not authorized by Doccol Corporation This warranty is available to the original purchaser of the unit and excludes all other legal and or conven tional warranties The responsibility of Doccol Corporation if any is limited to the specific obligations ex pressly assumed by it under the terms of the limited warranty In no event is Doccol Corporation liable for incidental or consequential damages of any nature whatsoever Some states provinces do not permit the exclusion or limitation of incidental or consequential damages and therefore the above may not apply to you
7. ler please make sure the sensor has been placed on the heating pad to be controlled Leaving the sensor outside will form an open loop operation controller will assume the tempera ture is low and will provide full power to the heater even if the heating pad is already over heated The power cord provided with controller is specially designed for high power applications Do not replace it with regular computer power cord This controller is designed to control devices recommended by Doccol Corporation only Using it to control a not recommended device can be dangerous and cause fire Doccol Corporation is not liable for damages caused by misuse of the controller lf an abnormal display or noise is observed turn the controller off unplug the power cord and contact the manufacturer before using it again Clean the controller only when it is cool and unplugged Operating Instructions 1 Description of the controller 2 Parameter Window LED displays temperature values and controller s system parameters Output status indicator In normal mode this LED indicates the heater status When it is on lit the heater is powered When it is off the heater power is off When it is flashing it means the heater is on and off intermittently to reduce the power output SET Key press to show current temperature settings get into parameters setting mode and confirming various actions taken Key press to increase displayed value
8. roller to the appropriate power level see next Section Turn the controller and heater on and then enter the desired set point temperature closed to your normal heating temperature To activate auto tuning just enter code 166 to get into the PID setting menu Set AT to 1 then exit the menu see Fig 3 The display will start to flash alternately between AT and the current water bath temperature which indicates auto tuning is in progress When the display stops flashing the auto tuning is finished Now the newly calculated PID parameters are set and are used for the system The new parameters will store in the memory even the power is off You should always write down your old PID parameters before letting the controller to perform auto tuning The P and D parameters have been pre set to 45 200 and 250 respectively This way if something goes wrong you can always go back to your old PID para meters Basically you must setup your heating system close to your actual heating environment Fig 3 Code 166 parameter setup flow chart Patent pending Doccol PID Temperature Controller Model WS1500B The duration of auto tuning depends on how fast the system is responding to the heating and cooling cycle If the temperature of the heater takes a long time to drop when heater is off the auto tuning could be a very long tuning process This is especially true with a well insulated heater The auto tuning should be able to tune mo
9. s the SET again to con firm the change For example if the temperature is 1 C higher than it should be during calibration then use to set the value to 1 to offset value Setting the output reduction The parameter window first will show a ut for a second followed its value Use and keys to change a ut value to your desired limit value and press SET Setting Celsius C or Fahrenheit F This model can only be set for Celsius Turning Timer OFF or ON When SET is pressed the display will show r and then 1 or 0 Press for 0 off and for 1 on Press SET will return to Normal mode Summary patametets and initial settings Symbol Display Description Range Initial Pp P Proportional band in 0 1 degree 0 600 45 Integral constant Second 0 900 200 Derivative constant second 0 300 250 p eyes ro 2 sc Off set degree 20 20 o ow ate Output power reduction 1 100 100 s F EE o Temosratreunt unit Sorte ore Timer si i Set temperature 0 99 9 mn lal Timer Timer tnoun ooo 99 9 Patent pending Doccol PID Temperature Controller Model WS1500B 8 Warranty Doccol Corporation warrants this controller to be free from defects in materials and workmanship for a period of one 1 year from the date of the original purchase when the device is utilized under normal condition The sensor of the controller
10. s the control characteristics of the controller to the heating characteristics of the heater The controller is said to be tuned to the heater when its memory is programmed with values telling it how fast the heater warms up cools off and how efficiently it transfers heat Describing how fast the heater heats when electricity is turned on and how fast it begins to cool when it s turned off These time constants are called the tuning parameters Every type of heater has its own unique set of tuning parameters For the controller to heat with stability it must have programmed with the tuning parameters for the heater currently being used When Should the Controller be tuned The controller is pre tuned to work with our heating pad You may use the auto tuning function to let the controller to determine the PID parameters for other heaters automatically Auto tuning function it s often known as self tuning can automatically optimize the PID parameters for your chosen heating system The auto tuning function will heat up your heater then let it cool down It will repeat this heat cool cycle several times Based on the response time of the whole heating system the controller will calculate and set the PID parameters for your heater Before using the auto tune function you must set the heating equipment up in the exact configuration it should be used If the heater has its own thermostat or power control turn both as high as they ll go Set the cont
11. st of your chosen with fairly good result 6 2 Manual Setting the PID parameter If you have tried auto tune and the parameters we provided but feel the performance is not ideal the fol lowing sections discuss the definition of these parameters and how to change them LCK Parameter lock This function is used to prevent user to change the critical parameters by accident User has to enter the code 166 to access the parameter setting menu Fig 3 P Proportional band It is in 0 1 degree unit This parameter control the output of the controller based on the difference between the measured and set temperature Larger the P number means the weaker the action lower gain When the sensor temperature is 10 degrees below the propor tional band 10 degrees below the setting the controller will have 100 output When the tem perature is 5 degree below the set point the output is 50 When the temperature is equal to the setting the controller will have 0 output assuming integral and derivative functions are turned off This constant also affects both integral and derivative action Smaller P values will make the both integral and derivative action stronger Please note the value of the P is temperature unit sensitive If you found an optimized P value when operating the controller in Celsius you need to multiply the P by 1 8 when changing the temperature unit to Fahrenheit Integral time The unit is in second This parameter controls the outpu
12. t of controller based on the difference between the measured and set temperature integrated with time Integral action is used to eliminate temperature offset Larger number means slower action When temperature fluctuates regularly system oscillating increase the integral time Decrease it if the controller is taking too long to eliminate the temperature offset When I 0 the system becomes a PD controller d Derivative time The unit is in second Derivative action contributes the output power based on the rate of temperature change Derivative action can be used to minimize the temperature over shoot by responding its rate of change The larger the number is the faster the action will be The derivative action change the controller output based on the rate of change rather than the net amount of change This will allow the controller to act sooner It will turn the heater to full power before the temperature drops too much T cycle rate The unit is in second This unit determines how long for the controller to calculate each action This parameter should remain at 2 second for almost all applications Press and hold SET key for 4 seconds until LED display LCK then release the SET key The display will show 0 To get into parameters setting mode you need to key in the pass code Use and keys to adjust the display to 166 which is the pass code and press SET The LED will show P for a second and then its P settin
13. um output power delivered by the heater for example if you set o wt 50 and your heater is 1000 watts the output will use 50 of the 1000 watts as the full output It reduces the 1000W heater to a 500W heater When the PID Fig 4 Code 155 parameter setup flow chart algorithm determines 50 output value the actual power output will be 250 watts Please note that when the wt is reduced to less than 30 you should increase the cycle rate T to give enough output resolution The smallest amount of power the controller can output is a half wave of the AC sine wave because the zero voltage cross switching For 60 Hz AC 2 seconds cycle rate provides 240 half waves for the controller to divide But when the awe is reduced to 30 there is only 80 parts of half wave to divide Increase the cycle rate to 6 second will increase the output resolution to 240 parts F Display unit setting This model can only be set to display the temperature unit in Celsius EF Timer setting The timer function can be turned off by user Setting these parameters Press and hold SET key for 4 seconds until Parameter Window displayed LCK Release the SET The display will show 0 Use and keys to adjust the display to 155 another pass code and press SET Setting the calibration offset The parameter window will first show 5 for a second and then its value Use and keys to change the setting When finished pres
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