PID-1500 THERMOELECTRIC & RESISTIVE HEATER TEMPERATURE CONTROLLER INSTRUCTION MANUAL

Transcription

1 LASER DIODE DRIVERS TEMPERATURE CONTROLLERS Simply Advanced Control for Your Cutting Edge Design PID-1500 THERMOELECTRIC & RESISTIVE HEATER TEMPERATURE CONTROLLER INSTRUCTION MANUAL P O Box 865, Bozeman, MT Phone (406) Fax (406) sales@teamwavelength.com

2 TABLE OF CONTENTS Features...2 Customer Service / Warranty...2 Optimize Your PID Quick Start for Thermoelectrics...3 Electrical Specifications (TE)...3 Mechanical Dimensions...4 Pin Descriptions & Adjustments...5 Operating Instructions with Thermoelectrics...7 Operating the PID-1500 with Resisitive Heaters...8 Electrical Specifications (TE)...8 Operating with the PIDPCB with POWERPAK-5V...10 FEATURES The PID-1500 Thermoelectric Temperature Controller offers many unique features. These include: Single supply operation: +5V to +12V Up to 1.5 Amps < C stability (24 hours) Adjustable Current Limit Analog input to adjust Temperature Setpoint remotely Supports Thermistors, IC sensors or RTDs Temperature Setpoint, Proportional Gain, and Current Limit are user adjustable Remotely Enable / Disable output Can be Modified for Resistive Heater control The PID-1500 Linear Bipolar, Thermoelectric Temperature Controller provides ultra-stable, low noise temperature control from a single output DC supply. The on-board 12-turn Temperature Set trimpot sets the desired temperature. Single turn trimpots control the proportional gain and current limit. A four position sensor select jumper applies the proper bias current for thermistors, IC sensors, or RTDs. All inputs and outputs are accessed via a single 14 pin header on the base. These pins provide easy access for DC supply input, sensor, thermoelectrics or resistive heaters, external control, and measurements with an external digital volt meter. The rugged, compact design can be used in many environments and has a -20 C to +85 C operating range. The integral heatsink can be removed to mount the module to a system chassis. CUSTOMER SERVICE / WARRANTY If you have any questions or comments, please call our technical staff at (406) Our hours are 8:00a.m. to 5:00p.m. MT. Wavelength warrants this product for 90 days against defects in materials and workmanship when used within published specifications. This warranty extends only to purchaser and not to users of purchaser's products. If Wavelength receives written notice of such defects during the warranty period, we will either repair or replace products which prove to be defective. It is purchaser's responsibility to determine the suitability of the products ordered for it's own use. Wavelength makes no warranty concerning the fitness or suitability of its products for a particular use or purpose; therefore, purchaser should thoroughly test any product and independently conclude its satisfactory performance in purchaser's application. No other warranty exists either expressed or implied, and consequential damages are specifically excluded. All products returned must be accompanied by a Return Material Authorization (RMA) number obtained from the Customer Service Department. Returned product will not be accepted for credit or replacement without our permission. Transportation charges or postage must be prepaid. All returned products must show invoice number and date and reason for return. 2 PID F Rev. H 2002, 2003 Wavelength Electronics, Inc.

3 OPTIMIZE YOUR PID-1500 POWER SUPPLY AND NOISE: The PID-1500 is designed for low noise operation. The power supply you select will directly affect the noise performance of the controller. We recommend using a regulated linear power supply for optimum performance. Depending on your requirements, you may be able to use a switching power supply. Each case must be evaluated as a switching power supply will affect noise, transient, and stability performance. The PID-1500 can be purchased with the PIDPCB evaluation kit plus the PWRPAK-5V +5V table top regulated switching power supply for easy initial operation. Limit Resistor QUICK START The following is a sketch showing the components required to operate the PID-1500, and a rough connection diagram. Much more detail is included in the PIN DESCRIPTION section, and you should review the entire manual before operating your thermoelectric with the PID TEC + TEC - Analog Input 5 Common 9 6 ACT T (+5 to +12V) + 7 } - SET T 10 GND Thermoelectric Module Enable / Disable LIM - LIM + SENSOR + SENSOR THERMISTOR, RTD, OR LM335 External Control 10k EXTERNAL VOLTMETER AD590 PID-1500 ELECTRICAL SPECIFICATIONS for use with THERMOELECTRICS* TEMPERATURE CONTROL GENERAL SPECIFICATIONS Temperature Control Range -99 to +150 C Short Term Stability, 1 hr. < C Power Requirements Long Term Stability, 24 hr. < C +5 to +12 VDC (+12.5V MAX) OUTPUT Supply Current Bipolar Output Current ± 1.5 Amps PID-1500 TE Limit Current Setting Compliance Voltage See note plus 100 Maximum Output Power 12 Watts Operating Temperature Maximum Internal Power Dissipation 9 Watts -20 to +85 C Current Limit Range 0 to 1500 ma Storage Temperature Control Loop PI -40 to +85 C Proportional Gain, adjustable 1 to 50 Warm-up Integrator time constant, fixed 1 second 1 hour to rated accuracy TEMPERATURE SENSOR TYPES Weight Thermistor Types (2 wire) NTC 4 oz. Thermistor Sensing Current 10 µa & 100 µa Size (H x W x D) Thermistor Range 1 kω kω 1.52 x 1.10" x 2.65" IC Sensor Types AD590, LM335 [39 x 28 x 67 mm] IC Sensor Bias (LM335) 1 ma RTD Types (2 wire) 100 Ω to 1 kω RTD Sensor Current 1 ma & 10 ma ANALOG INPUT TRANSFER FUNCTION 1 V / 1.3 V Setpoint / Analog Input SET T Monitor vs. ACT T Monitor Accuracy < 1% Temperature Range depends on the physical load, sensor type, and TE module used. Stability quoted for a typical 10kΩ thermistor at 100µA sensing current. Compliance Voltage varies with power supply voltage. A maximum compliance voltage of ± 10.5V will be obtained with a +12V input. A minimum compliance voltage of ± 4V will be obtained with +5V input. 5V operation will limit the Setpoint Voltage to 2.5 to 3.5V, thus limiting the temperature range of the PID AD590 requires an external bias voltage and 10kΩ sense resistor. * These specifications are for the PID1500 Revision C (introduced 10/2003). Specifications for Revision B were: Short Term Stability, 1 hr. < C Long Term Stability, 24 hr. < C Rev B: Compliance Voltage will vary depending on power supply voltages. A maximum compliance voltage of ± 8V will be obtained with +12V input, a minimum compliance voltage of ± 2.0V will be obtained with + 5V input. 5V operation will limit the Setpoint Voltage to 2.5 to 3.5V, thus limiting the temperature range of the PID , 2003 Wavelength Electronics, Inc. PID F Rev. H 3

4 MECHANICAL DIMENSIONS PCB LAYOUT PATTERN TOP VIEW DIMENSIONS FOR PIDPCB 4 PID F Rev. H 2002, 2003 Wavelength Electronics, Inc.

5 PIN DESCRIPTIONS & ADJUSTMENTS PID-1500 PIN OUT 14 SENSOR - 13 SENSOR + 12 TEC - / RH+ 11 TEC + / RH- 10 GND 9 8 ANALOG INPUT 7 SET T MONITOR 6 ACT T MONITOR 5 COMMON 4 N / A 3 N / A 2 LIM + 1 LIM - 1 & 2 LIM - & LIM + These pins can be used to enable or disable the PID-1500 output using a simple SPST switch. The maximum output current can also be fixed by placing a resistor across these pins. To Enable/Disable the output - Connect a switch between the pins. If the switch is open, the output will be enabled. Shorting the switch contacts disables the output current. To limit the output current with a fixed resistor - The Limit I trimpot should be turned fully clockwise when using the fixed resistor to limit the output current. By connecting a resistor with resistance R (in kω) between pins 1 and 2, the new maximum limit current for thermoelectrics can be calculated given the following equations. See page 8 for resistive heater calculations. For Thermoelectrics MAX TE I = R R Amps To calculate the desired resistance given the desired maximum limit current, use the following equations: 3 & 4 Not Used 200 I R = I TEMAX TEMAX kω 5 Common - This is a low current return for pins 6, 7, & 8 only. This pin provides ground potential to be used with the monitor outputs and analog input- pins 6, 7 & 8. This ground is internally starred with the circuit ground to provide the most accurate monitor measurement. Internally, it is connected to pin ACT T Monitor - This output and pin 5 are used to monitor the voltage, and therefore the actual temperature of the sensor. The ACT T MONITOR voltage will closely match the voltage set at pin 7 (SET T MONITOR) by the 12 turn TEMP SET trimpot. 7 SET T Monitor - This output and pin 5 are used in setting the temperature setpoint of the sensor. This voltage will range from 0-5 V and will closely match the voltage across the sensor when it is at the desired temperature. CAUTION: If you are operating the PID-1500 from a +5V supply voltage, the setpoint monitor voltage will be less than 5V (2.5V to 3.5V), limiting the temperature range of the PID Analog Input - This input and pin 5 are used to control the temperature setpoint remotely. The control voltage input range is 0 Volts to +5 V and the input sums directly with the TEMP SET trimpot. The transfer function for this input is 1 V / 1.3 V or for every 1.3 V applied to the analog input, the setpoint changes 1 V. (Input maximum is.) 9 (+5 V TO +12 VDC, VDC MAX) This pin along with pin 10 (GND) provides power to the control electronics and the thermoelectric output. 10 GND This pin along with pin 9 () provides power to the control electronics and provides power to the thermoelectric output. This is the only ground connection designed as a high current return. 11 & 12 TEC+ ( RH-) & TEC- (RH+) These pins source the control current to the thermoelectric or resistive heater load. CAUTION: If you are operating the PID-1500 from a +5V supply voltage, the output compliance voltage will be less than ±5V (±2.5V to ±3.5V) limiting the output power of the PID See page 8, Using the PID-1500 with Resistive Heaters. 13 Sensor + This pin is used to source the thermistor, IC sensor, or RTD reference current through the temperature sensor. The Sensor Select switch on the top will select between a 10µA, 100 µa, 1 ma, or 10 ma reference current. Selection of the proper reference current will allow the optimal temperature range of the sensor selected. 14 Sensor - This pin is used as the thermistor, IC sensor, or RTD current source return pin. This pin is at ground potential but should not be used for anything other than the sensor current source return. 2002, 2003 Wavelength Electronics, Inc. PID F Rev. H 5

6 6 PID F Rev. H 2002, 2003 Wavelength Electronics, Inc.

7 OPERATING INSTRUCTIONS WITH THERMOELECTRICS CONNECTING DC POWER, SENSORS, RESISTIVE HEATER OR THERMOELECTRIC MODULE Power (Pins 9 & 10) The PID-1500 operates from a single +5 to +12 volt power supply. Connect the positive voltage to (pin 9) and common to GND (pin 10). Check the power supply specifications to see that it has sufficient current capacity (TE current limit setting plus 100 ma) for the requirements of the load and control circuitry. Sensor (Pins 13 & 14) Epoxy or otherwise fix the temperature sensor to the device being cooled or heated in your application. Connect the sensor to pins 13 and 14. For sensors where polarity is important, pin 13 is Sensor+, and pin 14 is Sensor-. Select the appropriate current on the Sensor Select switch for the sensor you have selected. WARNING: Only one switch can be in the ON position for proper operation. All remaining switches must be in the OFF position. Thermistors require 10µA or 100µA. Use the LM335 IC sensor with the 1 ma setting. 500Ω and 1000Ω RTDs also require the 1 ma setting. 100Ω and 200Ω RTDs require the 10 ma setting for additional sensitivity. When connecting the AD590, place a 10kΩ metal film resistor across pins 13 & 14 and apply to the sensor as shown in the Quick Start Diagram [page 3]. Set all switches to OFF when using the AD590 sensor. Thermoelectric Module or Resistive Heater (Pins 11 & 12) Connect the thermoelectric module or resistive heater to pins 11 and 12. Make sure that the thermoelectrics are adequately connected to a heatsink. Properly transferring heat from the thermoelectric device is absolutely necessary for stable temperature control. Make sure your heat sink is rated to remove the heat generated by the temperature load and thermoelectric. If heat is not adequately removed using your heatsink, the temperature controlled load can go into thermal runaway and might be damaged. NOTE: The default factory loop direction is set up for NTC sensors (thermistors). While cooling, it flows from TEC+ (pin 11) to TEC- (pin 12). If using PTC sensor (LM335, AD590, or RTD s), reverse the cooler leads between pins 11 and 12. Current will flow from TEC- to TEC+, so TEC- will connect to the positive wire of the cooler, and vice versa. SET UP THE CURRENT LIMIT, OPERATING TEMPERATURE, AND PROPORTIONAL GAIN Current Limit Adjust Set the LIMIT I trimpot for the maximum current necessary to control the thermal load and below the maximum current ratings for your thermoelectric or resistive heater. Excessive current can damage your thermoelectric. Turning the trimpot clockwise increases the maximum output current from 0 to 1.5 Amps when configured for thermoelectrics. The numbers surrounding the trimpot are approximations and should be used as reference points when setting the limit current. The maximum limit current will be reduced when a resistor is placed between pin 1 (LIM -) and pin 2 (LIM +). See page 5 for more detail on this subject. Temp Setpoint Adjust (Monitor using Pins 7 and 5) The desired setpoint voltage will depend on the sensor selected. Use one of the following equations based on the sensor type you will be using. Thermistors and RTD's V SETPOINT = I BIAS x R (I BIAS in Amps, R in Ω) "R" equals the resistance value of the sensor at the desired operating temperature. The sensor bias current (I BIAS ) will be 10mA, 1mA, 100µA, or 10µA. LM335 & AD590 V SETPOINT = (0.010V/ C x T DESIRED ) Volts where T DESIRED is the setpoint temperature in C. Monitor the temperature setpoint on pin 7. To decrease the setpoint voltage, rotate TEMP SET adjust trimpot counter-clockwise. After the power supply voltage is applied and the PID-1500 is enabled then check the Temp Monitor (pin 6). The TEMP Monitor voltage should approach the setpoint voltage with time. Analog Input (Pins 8 and 5) The setpoint voltage can be controlled externally using the Analog Input on pin 8. The voltage on pin 8 sums directly with the TEMP SET trimpot voltage. The voltage range on this input can be from 0 Volts to the supply voltage. When using this input, the setpoint range is reduced to 3.75 Volts when operating from +5 VDC. For every volt applied to pin 8, the overall setpoint voltage will change by 1.3 Volt. Therefore the transfer function for this input is ( 1 Volt Output/ 1.3 Volt Input). Example: The TEMP SET trimpot is set at 1 Volt and the voltage applied to pin 8 is 2 Volts. The resulting setpoint temperature voltage will be 3.6 volts. Proportional Gain The factory setting for the proportional gain is 33. This gain can be adjusted from 1 to 50 to optimize the system for overshoot and settling time. Turning this potentiometer clockwise increases the gain and dampens the output. When adjusting the proportional gain, it is recommended to disable the PID momentarily to reset the Integrator. Making adjustments after the temperature has stabilized will not affect the system stability until has been removed to reset the PID control loop. Cooling the PID-1500 Heatsink The PID-1500 can dissipate a large amount of power depending on the power supply voltage being used and the current required to maintain temperature on the load. In some instances, an external fan my be required to keep the PID-1500 s heatsink at an acceptable temperature. Measure the PID-1500 heatsink temperature, if the temperature exceeds 75 C, then use a fan to cool the PID , 2003 Wavelength Electronics, Inc. PID F Rev. H 7

8 OPERATING THE PID-1500 WITH RESISTIVE HEATERS The PID-1500 can be configured to operate with resistive heaters. When configured for this mode, only thermistor temperature sensors (or NTC) can be used. The limit current is reduced to 1 Amp in this mode of operation. You will need to scale the LIMIT I trimpot range to the following scale: To limit the output current with a fixed resistor - The LIMIT I trimpot should be turned fully clockwise when using the fixed resistor to limit the output current. By connecting a resistor with resistance R (in kω) between pins 1 and 2, the new maximum limit current for resistive heaters can be calculated given the following equations. See page 5 for thermoelectric calculations. Please contact the factory if voltage operation of greater than +12 Volts is necessary. MAX RH I = For Resistive Heaters R R Amps To calculate the desired resistance given the desired maximum limit current, use the following equations: 200 I R = I RH MAX RH MAX kω PID-1500 ELECTRICAL SPECIFICATIONS for use with RESISTIVE HEATERS* TEMPERATURE CONTROL GENERAL SPECIFICATIONS Temperature Control Range Ambient to +250 C Short Term Stability, 1 hr. < C Power Requirements Long Term Stability, 24 hr. < C +5 to +12 VDC (+12.5V MAX) OUTPUT Supply Current Bipolar Output Current ± 1.5 Amps PID-1500 TE Limit Current Setting Compliance Voltage See note plus 100 Maximum Output Power 12 Watts Operating Temperature Maximum Internal Power Dissipation 9 Watts -20 to +85 C Current Limit Range 0 to 1500 ma Storage Temperature Control Loop PI -40 to +85 C Proportional Gain, adjustable 1 to 50 Warm-up Integrator time constant, fixed 1 second 1 hour to rated accuracy TEMPERATURE SENSOR TYPES Weight Thermistor Types (2 wire) NTC 4 oz. Thermistor Sensing Current 10 µa & 100 µa Size (H x W x D) Thermistor Range 1 kω kω 1.52 x 1.10" x 2.65" IC Sensor Types AD590, LM335 [39 x 28 x 67 mm] IC Sensor Bias (LM335) 1 ma RTD Types (2 wire) 100 Ω to 1 kω RTD Sensor Current 1 ma & 10 ma ANALOG INPUT TRANSFER FUNCTION 1 V / 1.3 V Setpoint / Analog Input SET T Monitor vs. ACT T Monitor Accuracy < 1% Temperature Range depends on the physical load, sensor type, and resistive heater used. Stability quoted for a typical 10kΩ thermistor at 100µA sensing current. Compliance Voltage will vary depending on power supply voltages. A maximum compliance voltage of V will be obtained with +12V input, a minimum compliance voltage of +4V will be obtained with + 5V input. * These specifications are for the PID1500 Revision C (introduced 10/2003). Specifications for Revision B were: Short Term Stability, 1 hr. < C Long Term Stability, 24 hr. < C Rev B: Compliance Voltage will vary depending on power supply voltages. A maximum compliance voltage of ± 8V will be obtained with +12V input, a minimum compliance voltage of ± 2.0V will be obtained with + 5V input. 8 PID F Rev. H 2002, 2003 Wavelength Electronics, Inc.

9 QUICK START for RESISTIVE HEATERS [PID1500 REV C: introduced 10/2003] Remove Jumper JP1 for unipolar operation with resistive heaters: QUICK START for RESISTIVE HEATERS [PID1500 REV B] PID-1500 Modification for Unipolar Operation A small phillips head screwdriver, a small slotted head screwdriver, and a pair of wire cutters are required to convert the PID-1500 to resistive heater operation. First, remove two phillips head screws that hold the PID-1500 s heatsink to the internal mount with the phillips head screwdriver. On the same side as the heatsink, notice two slotted head nylon screws. Remove these screws with the slotted head screwdriver and gently slide the electronic assembly down and out of the plastic enclosure. With the surface mount component side of the electronic assembly facing you and the leads of the device facing down, use the wire cutters to cut the jumper as shown in Figure 1. Reassemble the electronics in the enclosure and the heatsink to the internal mount. FIGURE 1 Cut this jumper for Resistive Heater Operation The above is a sketch showing the wiring for resistive heaters based on the type of sensor used. Much more detail is included in the PIN DESCRIPTION section, and you should review this entire section before operating your resistive heater with the PID Limit Resistor 5 Common 9 6 ACT T (+5 to +12V) + 7 } SET T - 10 GND Resistive Heater Enable / Disable TEC + 12 LIM - LIM + TEC - Analog Input SENSOR + SENSOR THERMISTOR External Control EXTERNAL VOLTMETER The above is a sketch showing the components required to operate the PID-1500 with resistive heaters, and a rough connection diagram. Much more detail is included in the PIN DESCRIPTION section, and you should review this entire section before operating your resistive heater with the PID , 2003 Wavelength Electronics, Inc. PID F Rev. H 9

10 OPERATING THE PIDPCB WITH POWERPAK-5V See page 4 for PCB dimensions. 10 PID F Rev. H 2002, 2003 Wavelength Electronics, Inc.

11 PIDPCB EVALUATION BOARD SCHEMATIC S3 C&K 7101MD9ABE ENABLE DISABLE R1 LIMIT SET PWRPAK-5V HOT WALL POWER SUPPLY EARTH NEUTRAL +5V GND J1 RAYTHEON RAPC712 PIN SHUNT SLEEVE TEST POINT TEST POINT C1 330uF 25V J2 JOHNSON RED J3 JOHNSON BLACK D1 P6KE15ACT S2 C&K 7101MD9ABE ACT T SET T S1 C&K 7101MD9ABE POWER OFF POWER ON C2 0.1 D S Q1 2N5485 G P1 ALTECH AK500/12WP U1 PID-1500 TEC+ TEC- LIM- LIM+ NA NA COMMON ACT T SET T MOD IN GND SENS+ SENS- D2 LED GREEN 1997, 1998 Wavelength Electronics, Inc D 11