Wavelength Electronics HTC 4000 User manual

HTC4000 TEMPERATURE CONTROLLER
www.teamwavelength.com
©2012 HTC4000-62400-B
FEATURES
•Compact Size
•±4.0 A Output
•Interfaces with Thermistors, IC Sensors, & RTDs
•Single supply operation +5 V to +12 V
•+10.8 V compliance with +12 V input
•Stabilities as low as 0.0009°C
•Temperature Setpoint, Output Current Limit,
Sensor Bias, Proportional Gain, and Integrator
Time Constant are User Adjustable
•Monitor outputs for Temperature Setpoint and
Actual Temperature
•Linear Bipolar Output operates thermoelectrics
HTC 4000
ORDERING INFORMATION
GENERAL DESCRIPTION
The advanced and reliable circuitry of the HTC
Series achieves 0.0009°C temperature stability. Its
small, low prole package is ideal for designs with
space constraints. The linear, PI control loop offers
maximum stability while the bipolar current source
has been designed for higher efciency.
The HTC Temperature Controllers are easily
configured for any design. Virtually any type of
temperature sensor can be used with the HTC and a
built in sensor bias current source simplies use with
resistive temperature sensors. The independently
adjustable Proportional Gain (P) and Integrator Time
Constant (I) can be modied to optimize temperature
overshoot and stability.
Other features offer added exibility. A single resistor
sets the maximum output current to your load. An
onboard reference voltage simplies potentiometer
control of the temperature setpoint. You can also
choose to operate remotely with an external setpoint
voltage. Two monitor pins provide access to the
temperature setpoint voltage and the actual sensor
voltage.
Low Prole, Efcient
Temperature Controller
Model
HTC4000-62
PWRPAK-5V
HTCEVAL PCB
THERM-PST
Description
±4 A Temp Controller (for 0.062” board)
+5 V @ 8 A Power Supply
Evaluation Board, 0.062” thick
(Includes HTC Heatsink, and thermal grease)
Thermal grease
November, 2012
HTC Temperature Controller
Limit -1 -
2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 -
10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 -
Limit + PID Out V REF Out
Common ACT T Monitor SET T Monitor
SetpointInput V+ GND TEC + TEC - Sensor + Sensor - R + R - R + C + R - C -
BIAS BIAS PROP INT PROP INT
Figure 1
HTC Series Pin-Out, Top View
Pb
RoHS
Compliant
e

HTC4000 TEMPERATURE CONTROLLER
www.teamwavelength.com
© 2012 HTC4000-62400-B
PAGE 2
Figure 2
Quick Connect
This diagram shows HTC connections for basic operation.
Details for each component are on pages 7 & 8.
LIMIT -
LIMIT +
GND (for pin 9)
V+
3.675 V REF OUT
Setpoint Input
V+
(+5 V to +12 V)
SENSOR -
SENSOR +
Thermoelectric Module
Thermistor,
RTD, or LM335
10kΩ
AD590
+8 V (minimum)
TEC -
TEC +
PID OUT
}
External
Voltmeter
9
10
7
5
8
4
14
13
12
11
3
1
6ACT T Monitor
SET T Monitor
Common
RPROP -
RPROP +
17
18
CINT -
CINT +
19
20
2
RBIAS -
RBIAS +
16
15
R
Sensor Bias
R
Limit
Install Jumper
for Bipolar
Operation
R
Prop Gain
R
T
Operate from single +5 V
to +12 V power supply
Measure Temperature Setpoint
& Actual Temperature
Control Temperature Setpoint with
resistor, trimpot, or external voltage.
Set Current Limit with
trimpot or resistor.
Select R
value to optimize
feedback voltage on
pins 13 & 14
Sensor Bias
Set Integrator Time Constant
between 0 and 10 seconds
Install a 1 MΩresistor to remove
the Integrator and operate as a
Proportional Controller.
Set Proportional Gain
between 1 and 100.
C
INT
Fixed,
Metal Film OR
1 MΩ
+
-
OR
Figure 3
Test Load Conguration
(for conrming connections and settings)
SENSOR -
SENSOR +
TEC -
TEC +
14
13
12
11
Simulated
Sensor
0.1Ω
10 W
Values shown can simulate
any load up to the HTC Series
maximum of 4 A.

HTC4000 TEMPERATURE CONTROLLER
www.teamwavelength.com
© 2012 HTC4000-62400-B
PAGE 3
If thermistor, TE module, or laser diode are case-common, the laser diode driver and TE controller power supplies
must be isolated from each other.
 Stability quoted for a typical 10 kΩthermistor at 100 µA sensing current. For details, refer to TN-TC02 : How
is Temperature Stability Measured?. (http://www.teamwavelength.com/downloads/notes/tn-tc02.pdf#page=1)
 User congurable with external resistor.
 User congurable with external capacitor.
Compliance voltage will vary depending on power supply voltage and output current.
 Temperature Range depends on the physical load, sensor type, input voltage, and TE module used.
Output power is limited by internal power dissipation and maximum case temperature. See SOA chart to calculate
internal power dissipation. Damage to the HTC will occur if case temperature exceeds 50°C.
AD590 requires an external bias voltage and 10 kΩresistor.
Short Term Stability (1-hr) 
Short Term Stability (1-hr) 
Long Term Stability (24-hr) 
CONTROL LOOP
P (Proportional Gain) 
I (Integrator Time Constant) 
Setpoint vs. Actual T Accuracy
OUTPUT, THERMOELECTRIC
Current, peak, see SOA Chart
Compliance Voltage, 
Pin 11 to Pin 12
Temperature Range 
Current Limit Range 
(±2% FS Accuracy)
Output Power contact factory
for higher power operation
POWER SUPPLY
Voltage, V+
Current, V+ supply, quiescent
SENSORS
Sensor Bias Current Range 
Resistive Sensor Type
IC Sensor Types 
ELECTRICAL AND OPERATING SPECIFICATIONS
V+
IOUT
PMAX
TOPR
TSTG
+5 to +12
±4.0
17
0 to +50
-40 to +125
Volts DC
Amps
Watts
˚C
˚C
SYMBOL VALUE UNIT ABSOLUTE MAXIMUM RATINGS
100
10
5
±4.1
17
12
10m
OPERATING PARAMETER
TEMPERATURE CONTROL
TEST CONDITIONS MIN TYP UNITS
MAX
˚C
˚C
˚C
A / V
Sec.
mV
Amps
Volts
Volts
Volts
mA
Watts
V
mA
A
Weight
< 1.5 oz.
Connectors
20 pin header, 0.1” spacing
Warm-up
1 hour to rated accuracy
OFF ambient temperature
ON ambient temperature
OFF ambient temperature
V+ = 5 V I
OUT
= 500 mA
I
OUT
= 2.0 A
I
OUT
= 4.0 A
Thermistors, RTDs
AD590, LM335
P
1
0
0.2
±3.9
1µ
Size (H x W x D)
0.34" x 2.65" x 1.6"
[8.6 x 67 x 41 mm]
Required Heatsink Capacity
5.6 °C / W / 3 in
Supply Voltage (Voltage on Pin 9 - contact factory for higher V operation) 
Output Current (See SOA Chart)
Power Dissipation, TAMBIENT = +25˚C (See SOA Chart)
Operating Temperature, case
Storage Temperature
0.0009
0.002
0.0015
PI
2
±4.0
V+ – 1.2
V+ – 0.8
V+ – 1.2
0 - 4000
5
200

HTC4000 TEMPERATURE CONTROLLER
www.teamwavelength.com
© 2012 HTC4000-62400-B
PAGE 4
Resistor value of 0 Ωto 1 MΩbetween pins 1 & 2 limits maximum output current.
Short pins 2 & 3 for bipolar operation. Bipolar operation allows current to ow in
both directions, and is required when using the controller with TECs.
3.675 Volt Reference < 50 ppm stability (15 ppm typical)
Measurement ground. Low current return used only with pins 6, 7, & 8. Internally
shorted to pin 10.
Temperature voltage monitor. Buffered measurement of voltage across Sensor +
& Sensor–. [1 kΩoutput impedance]
Setpoint voltage monitor. Buffered measurement of the setpoint input (pin 8).
Remote Setpoint voltage input. Input impedance = 1 MΩ.
Range: 0 to V+ - 1.3 V. Damage threshold: Setpoint < -0.5 V or Setpoint > V+.
Supply voltage input. +5 V to +12 V.
Power Supply Ground. Used with pin 9 for high current return.
TEC+ & TEC- supply current to the TE module. With NTC sensors, connect TEC+
to positive lead of TE module. With PTC sensors, connect TEC- to positive lead
of TE module.
A sensor bias current will source from Sensor+ to Sensor- if a resistor is tied
across RBIAS+ and RBIAS-. Connect a 10 kΩresistor across Sensor+ & Sensor-
when using an AD590 temperature sensor. See page 7, step 4.
Resistance between pins 15 & 16 selects sensor current from 1 µA to 10 mA.
Range is 0 Ωto 1 MΩ.
Resistance between pins 17 & 18 selects Proportional Gain between 1 & 100.
Range is 0 Ω to 495 kΩ.
Capacitance between pins 19 & 20 sets the Integral Time Constant between
0 and 10 seconds. 0 seconds (OFF) = 1 MΩresistor
0.1 to 10 seconds = 0.1 µF to 10 µF.
PIN DESCRIPTIONS
LIMIT-
LIMIT+
PID OUT
V REF OUT
COMMON
ACT T MONITOR
SET T MONITOR
SETPOINT INPUT
V+
GND
TEC+
TEC-
SENSOR+
SENSOR-
RBIAS+
RBIAS-
RPROP+
RPROP-
CINT+
CINT-
FUNCTIONPINPIN NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

HTC4000 TEMPERATURE CONTROLLER
www.teamwavelength.com
© 2012 HTC4000-62400-B
PAGE 5
0.01.02.03.04.05.06.07.08.09.010.0 11.0 12.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Voltage Drop (V+ - V
LOAD
)
Current (A)
Caution:
Do not exceed the Safe Operating Area (SOA). Exceeding the SOA voids the warranty.
An online tool for calculating Safe Operating Area is available at:
http://www.teamwavelength.com/support/calculator/soa/soatc.php .
To determine if the operating parameters fall within the SOA of the device, the maximum voltage drop across the
controller and the maximum current must be plotted on the SOA curves.
These values are used for the example SOA determination:
V+ = 12 volts
VLOAD = 5 volts
ILOAD = 3.5 amp
Follow these steps:
1. Determine the maximum voltage drop across the controller, V+ - VLOAD, and mark on the X axis.
(12 volts - 5 volts = 7 volts, Point A)
2. Determine the maximum current, ILOAD, through the controller and mark on the Y axis:
(3.5 amp, Point B)
3. Draw a horizontal line through Point B across the chart. (Line BB)
4. Draw a vertical line from Point A to the maximum current line indicated by Line BB.
5. Mark V+ on the X axis. (Point C)
6. Draw the Load Line from where the vertical line from point A intersects Line BB down to Point C.
This chart assumes you have appropriate heatsinking on the HTC.
25 C Ambient
50 C Case Maximum
These values are determined from the specications of the TEC
}
HTC Safe Operating Area
AC
BB
B
SAFE OPERATING AREA & HEATSINK REQUIREMENTS

HTC4000 TEMPERATURE CONTROLLER
www.teamwavelength.com
© 2012 HTC4000-62400-B
PAGE 6
The HTC Series Temperature Controller is a linear
controller designed for stable, low noise operation.
We recommend using a regulated, linear supply
for optimum performance. Depending on your
requirements, you may be able to use a switching
power supply. [A switching power supply will affect
noise and stability.]
The recommended operating voltage is between +5 V
and +12 V. The voltage available to the thermoelectric
is the “Compliance Voltage.” Compliance voltage
varies with the input voltage.
A heatsink is required to properly dissipate heat from
the HTC mounting surface. Maximum internal power
dissipation is 17 Watts. Special attention to grounding will ensure safe operation.
Some manufacturers package devices with one lead
of the sensor or thermoelectric connected to the metal
enclosure or in the case of laser diodes, the laser
anode or cathode.
WARNING: Precautions should be taken not to
earth ground pins 11, 12, or 13. If any of these pins
are earth grounded, then pins 5, 10, and 14 must be
oating with respect to earth ground.
POWER SUPPLY AND NOISE GROUNDING
Unless Earth and Instrument Ground are
connected via the power supply, Instrument Ground
is floating with respect to Earth Ground
Earth Ground on
USA 115 VAC wall socket
Common or
Instrument Ground
EARTH
DC POWER SUPPLY
- +

HTC4000 TEMPERATURE CONTROLLER
www.teamwavelength.com
© 2012 HTC4000-62400-B
PAGE 7
RLIMIT = 2752 * ILIMIT
1.8864 - 0.4128 * ILIMIT
ILIMIT RLIMIT
HTC4000 with TE
1.0 A
2.0 A
3.0 A
4.0 A
1867 Ω
5188 Ω
12.7 kΩ
46.8 kΩ
10 µA
X
1 mA
X
X
10 mA
X
10 kΩ Thermistor
100 kΩ Thermistor
RTD
LM335
RBIAS =1.225
IBIAS
-122
2
3
Limit +
PID OUT
Install
Jumper
for
Bipolar
Operation
2
2
1
Fixed,
Metal Film
OR OR
LIMIT +
LIMIT -
Adjustable
Trimpot
Switch
Enable = Open
Disable = Closed
Use a trimpot no more than twice the
calculated value of RLIMIT for best resolution.
Thermistors are Negative Temperature
Coefcient (NTC) sensors. Thermistor
resistance decreases as temperature
increases.
RTDs and IC Sensors are Positive
Temperature Coefcient (PTC) sensors.
A PTC sensor’s resistance increases
with increasing temperature.
15
16
Fixed,
Metal Film
OR
R +
R -
Adjustable
(200 kΩtypical)
BIAS
BIAS
Use a trimpot no more than twice
the calculated value of RBIAS for best resolution
.
RBIAS determines the bias
current sourced to the sensor
attached at pins 13 & 14. The
chart indicates recommended
currents for typical sensors.
When using a voltage feedback
sensor (such as an AD590),
leave pins 15 & 16 open.
1 Output Current Bias - Pins 2 & 3
Limit Output Current - Pins 1 & 2
Sensor Bias Current - Pins 15 & 16
Sensor - Pins 13 & 14
3
4
OPERATION WITH THERMOELECTRICS
Virtually any type of temperature sensor
can be used with the HTC. It must
produce a feedback voltage between
0.25 V and (V+ minus 1.3 V). See
Step #3 (RBIAS) to set the bias current
to the sensor.
IBIAS
10 mA
1 mA
100 µA
10 µA
RBIAS
0 Ω
1.1 kΩ
12.1 kΩ
122 kΩ
100 µA
X
+8 V
minimum
AD590
THERMISTOR,
RTD, or LM335
OR 10 kΩ
Sensor +
Sensor -
Indicated resistor values will set ILIMIT within ±5% of indicated value.
If greater accuracy is required for ILIMIT, refer to Technical Note
TN-TC07: Understanding and Improving the Accuracy of the Current
Limit Setpoint on HTC Series Temperature Controllers.

HTC4000 TEMPERATURE CONTROLLER
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© 2012 HTC4000-62400-B
PAGE 8
The controller adjusts the temperature
of the load until the voltage across the
temperature sensor equals the Setpoint
Input voltage (pins 8 & 15). To adjust the
temperature setpoint, rst determine the
voltage across the sensor at the target
temperature; apply that same voltage
across pins 8 and 15 of the controller.
The diagrams to the left show three
possible configurations for setpoint
voltage input.
CINT =
1 MΩ
TINT
17
18
Fixed,
Metal Film
OR
R +
R -
Adjustable
(500 kΩtypical)
PROP
PROP
Use a trimpot no more than twice the
calculated value of RPROP for best resolution.
RPROP sets the gain of the system from 1
to 100. A higher proportional gain can
help minimize the time to settling but may
destabilize loads with long intrinsic lag times.
Too low a gain may result in oscillations
about setpoint. For most applications, a gain
of 33 works (RPROP = 10 kΩ). Change the
proportional gain while the output is OFF.
Proportional Gain - Pins 17 & 18
Cint sets the integral time constant of the
system from 0 to 10 seconds. Use a capacitor
with Dissipation Factor less than 1% for best
performance. These typically include metallized
lm polyester, polypropylene & some ceramic
capacitors. Capacitors with Dissipation Factors
>1% (typically electrolytic, tantalum, and ceramic)
will cause drift in the Integrator circuit. To disable
the integrator, use a 1 MΩresistor across pins
19 & 20.
RPROP =
500 kΩ
GAIN
-5 kΩ
19
20
C +
C -
INT
INT
CINT
Fixed,
Metal Film
OR 1 MΩ
CINT
1 MΩ
1 µF
5 µF
10 µF
TINT
0 (OFF)
1 second
5 seconds
10 seconds
4
8
3.675 V Ref Out
Setpoint Input
(V+ Maximum)
Common 5
R1
R
1
= 10 k to
100 kΩ
Use Ref
Voltage
Provided
R1
Use V+
for higher
sense voltage
1 kΩ
V+
OR
Apply
Remote
Voltage
+
-
V
REF
Select V
REF
to cover
your temperature range
OR
11
12
TEC +
TEC -
Optional Ammeter
to monitor
TE Current
A
Connect the TE module and an ammeter
if you want to monitor TE current. Current
ows from positive to negative when the
HTC is cooling with an NTC temperature
sensor. When using an LM335, AD590,
RTD, or other PTC sensor, reverse the
polarity of the leads (i.e. connect the
positive lead of the TE module to TEC-
and the negative lead of the TE module
to TEC+).
Integrator Time Constant - Pins 19 & 20
Temperature Setpoint - Pins 8 & 5 (Pin 4 optional)
TE Module & Output Current Measurement - Pins 11 & 12
Monitor setpoint with a DVM
at pins 7 & 5, or actual sensor
voltage across pins 6 & 5.
6
5
7
8
RPROP
495 kΩ
5 kΩ
0 Ω
GAIN
1
50
100
OPERATION WITH THERMOELECTRICS, continued
Example:
Desired Temperature: 25°C
Sensor: 10 kΩthermistor
Resistance at 25°C: 10 kΩ
Bias Current: 100 µA
VSET = 10 kΩ* 100 µA = 1 V

HTC4000 TEMPERATURE CONTROLLER
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© 2012 HTC4000-62400-B
PAGE 9
0 FS
1/2 FS
HTC1500/HTC3000
LIMIT RANGE
LIMIT-
HTC-4000
4.0 AMP
TEMPERATURE CONTROLLER
1 20
LIMIT+ 1 4 5 62 3 7 8 9 10
ON
10 90
33
62
DISABLE
ENABLE
SET T
ACT T ON
OFF
INPUT: +5 VDC
CINT +
V+
COMMON
MONITOR
ACT T
- +
CINT -
SET T
MONITOR
SETPOINT
INPUT
GND
TEC -
TEC +
SENSOR -
SENSOR +
MONITOR +
COMMON
OFF
ON
RPROP
SW1
SET T
R
LIMIT
R
LIMIT
INT
C
PROP GAIN
0.5 AMP/1.0 AMP:
1.0 AMP/2.0 AMP:
1.5 AMP/3.0 AMP:
SW1: 1 ON
SW1: 2 ON
SW1: 1,2 OFF
SW1: 5 ON
SW1: 4 ON
SW1: 3 ON
UNIPOLAR: PTC
UNIPOLAR: NTC
BIPOLAR
OUTPUT MODE
SW1: 7 ON
SW1: 8 ON
SW1: 9 ON
SW1: 10 ON
SW1: 6 ON
SW1: 6 OFF
SENSOR BIAS CURRENT
EXTERNAL:
R
SETPOINT CONTROL
SET T:
10µA:
100µA:
1 mA:
10 mA:
avelength Electronics, Inc.
CINT
Power
Switch
Supply
Voltage
Terminal
Block
Configuration
Switch
+ -
PWRPAK-5V
5 VOLTS
Proportional
Gain
Sensor Bias
Current
Setpoint
Input
Monitor +
&
Common
Output
Enable/Disable
Limit
Range
Output
Mode
DVM
Measurement
Select Switch
Male Power Plug
Digi-Key P/N
SC1050-ND
Terminal Block
Wire your thermoelectric module and sensor via
the 12-contact screw terminal connector. Connect
the external setpoint voltage input here, also. Other
signals are available on the PCB as well as on
the terminal block: Actual and Setpoint monitors,
Integrator Time Constant Capacitor, and Supply
Voltage.
We recommend using a minimum of 22 AWG wire
to the thermoelectric.
To Install the HTC on the HTCEVALPCB
Evaluation Board with HTC Heatsink
1. Feed the HTC pins through the large opening in
the HTCEVALPCB board so that the HTC pins
are on the top side of the evaluation board and
the mounting tabs are against the back side of
the board.
2. Line up the heatsink holes behind the HTC and
insert the screws through the evaluation board
and HTC unit into the tapped heatsink holes.
3. Line up the HTC pins on the solder pads on the
evaluation board and tighten the screws.
4. Solder the HTC pins to the solder pads.
NOTE: Do not exceed 700°F soldering
temperature for more than 5 seconds on any pin.
5. If you are using a PCB that is not 0.062” thick,
the HTC pins need to be bent. Clamp the pins
between the HTC housing and the bend to avoid
damage to the HTC.
Conguration Switch - SW1
The Conguration Switch selects the OUTPUT
MODE, LIMIT RANGE, SETPOINT INPUT, and
SENSOR BIAS CURRENT. Before applying
voltage to the HTCEVALPCB, check the switch
settings for proper conguration.
The FACTORY DEFAULT settings are:
1 4 5 62 3 7 8 9 10
ON
OFF
ON
SW1
Limit Range: Lowest
(SW1:1 ON, SW1:2 OFF)
Bipolar Operation:
(SW1:3 ON, SW1:4 & 5 OFF)
Onboard Trimpot Control: (SW1:6 ON)
100µA Sensor Bias Current:
(SW1:7, 9 , & 10 OFF, SW1:8 ON)
The following page details the switch settings.
OPERATION OF HTCEVALPCB

HTC4000 TEMPERATURE CONTROLLER
www.teamwavelength.com
© 2012 HTC4000-62400-B
PAGE 10
LIMIT RANGE
For best results, set RLIM trimpot
fully clockwise (full-scale) and
use current limit switches.
Switch positions 1 & 2 set the
“full scale” value to one of three
current ranges. Select a range
that includes your maximum
operating current:
If you want to accurately measure
the output current to the TE
module, connect an ammeter
in series with the TE module as
described on page 8, step 8 of
the datasheet.
0 FS
1/2 FS
LIMIT
RANGE
0 - 1.5 A
0 - 3.0 A
0 - 4.0 A
SW1: 1
ON
OFF
OFF
SW1:2
OFF
ON
OFF
OUTPUT MODE
The HTCEVALPCB can be set to
operate the HTC controllers in bipolar
(TEC) or unipolar (heater) operation.
The HTC4000 is not recommended
for unipolar operation, or for use
with resistive heaters.Configure
the switches for Bipolar NTC/PTC
operation.
SW1: 4
OFF
ON
OFF
OUTPUT BIAS
Bipolar NTC/PTC
Heating, Unipolar: NTC
Heating, Unipolar: PTC
SW1:5
OFF
OFF
ON
SW1: 3
ON
OFF
OFF
SETPOINT INPUT
The temperature setpoint can be
controlled by the onboard R SET T
trimpot or with an external input
voltage on the terminal block
(SETPOINT INPUT). Switch
position 6 determines how the
setpoint is controlled.
SENSOR BIAS CURRENT
Choosing the correct bias current for your sensor is important. Based on
the resistance vs. temperature characteristics of your sensor, select a bias
current that gives you a voltage feedback between 0.25 V and (V+ minus
1.3 V).
Recommended for:
100 kΩ Thermistors
10 kΩ Thermistors
RTDs & LM335 IC Sensor
RTDs
AD590
SW1:10
OFF
OFF
OFF
ON
OFF
SW1: 9
OFF
OFF
ON
OFF
OFF
SW1:8
OFF
ON
OFF
OFF
OFF
SW1:7
ON
OFF
OFF
OFF
OFF
BIAS CURRENT
10 µA
100 µA
1 mA
10 mA
0 mA
SUPPLY VOLTAGE
A DC voltage can be applied via
the PWRPAK-5V input connector
or the terminal block connections
labeled V+ and GND. USE ONLY
ONE INPUT to supply power to
the HTCEVALPCB.
POWER SWITCH
This switch enables or disables
the DC voltage from either the
PWRPAK -5V input connector or
the terminal block connections
labeled V+ and GND. The green
LED will light when power is
applied to the HTCEVALPCB and
the switch is “ON”.
PROPORTIONAL GAIN
Begin with a proportional gain of 33 (factory default). The temperature vs.
time response of your system can be optimized for overshoot and settling
time by adjusting the RPROP trimpot between 10 and 90. Increasing the gain
will dampen the output (longer settling time, less overshoot).
For more information on PID controllers, see Technical Note TN-TC01-
Optimizing Thermoelectric Temperature Control Systems (http://www.
teamwavelength.com/downloads/notes/tn-tc01.pdf#page=1).
OUTPUT ENABLE / DISABLE
The output current is enabled or
disabled by toggling this switch.
MONITOR + and COMMON
With a DVM connected to MONITOR + and COMMON, toggle the
Measurement Select Switch to measure SET T (setpoint temperature)
or ACT T (actual temperature). Alternatively, SET T and ACT T can be
measured via the ACT T and SET T MONITORs (referenced to COMMON)
on the terminal block.
CINT
A 1µF capacitor is mounted on the PCB, as shown on page 9, and will
give you a one second integrator time constant. By adding capacitance
across the CINT+ and CINT- inputs on the terminal block, you can increase
the integrator time constant. See page 8, step 6 for more information. Use
only capacitors with a dissipation factor less than 1%.
For more information on PID controllers, see Technical Note TN-TC01
- Optimizing Thermoelectric Temperature Control Systems (http://www.
teamwavelength.com/downloads/notes/tn-tc01.pdf#page=1).
SW1:6
ON
OFF
Temperature Setpoint
Onboard RSET T Trimpot
Remote SETPOINT INPUT
HTCEVALPCB SETTINGS