Alpha Omega Instruments 800 Series User manual

Series 800 and Series 850
THERMOELECTRIC COOLER CONTROLLER
INSTRUCTION MANUAL
This manual was written for users of either the Series 800 Thermoelectric Cooler Controller
or the rack mounted Series 850 Thermoelectric Cooler Controller. Where differences in the
two controllers are important to distinguish, those distinctions have been so noted.
Email: [email protected]
401.333.5550Fax: [phone]Phone:
30 Martin Street, Cumberland, RI 02864 VERSION 4.1 COPYRIGHT 2004, ALPHA OMEGA INSTRUMENTS
CORP. ALL RIGHTS RESERVED INCLUDING THE RIGHT TO
REPRODUCE THIS MANUAL, OR ANY PORTION THEREOF, IN
A
NY FORM.
ALPHA OMEGA
INSTRUMENTS

WARRANTY
Alpha Omega Instruments Corp. warrants the products delivered to be free from
defects in material and workmanship at the time of delivery to the Fob point specified
in the purchase order, its liability under this warranty being limited to repairing or
replacing, at Alpha Omega Instruments' option, items which are returned to it
prepaid within two (2) years from the date of shipment and found to Seller’s
satisfaction to have been so defective. In no event shall Alpha Omega Instruments
Corp. be liable for consequential damages.
NO PRODUCT IS WARRANTED AS BEING FIT FOR A PARTICULAR PURPOSE AND
THERE IS NO WARRANTY OF MERCHANTABILITY.
This warranty applies only if:
i) The items are used solely under the operating conditions and manner recommended in
this manual, specifications, or other literature;
ii) The items have not been misused or abused in any manner or repairs attempted thereon;
iii) Written notice of the failure within the warranty period is forwarded to Alpha Omega
Instruments Corp. and, the directions received for properly identifying items returned under
warranty are followed;
iv) The return notice authorizes Alpha Omega Instruments Corp. to examine and disassemble
returned products to the extent the Company deems necessary to ascertain the cause of
failure.
The warranties stated herein are exclusive. THERE ARE NO OTHER
WARRANTIES, EITHER EXPRESSED OR IMPLIED, BEYOND THOSE SET
FORTH HEREIN, and Alpha Omega Instruments Corp. does not assume any other
obligation or liability in connection with the sale or use of said products.
Disclaimer of Warranty
Alpha Omega Instruments makes no representation or warranties, either expressed or
implied, by or with respect to anything in this manual, including, but not limited to, implied
warranties of merchantability or fitness for a particular purpose. In no event will Alpha
Omega Instruments Corp. be liable for any damages, whether direct or indirect, special,
consequential, or incidental arising from the use of this manual. Some states in the USA do
not allow the exclusion of incidental or consequential damages. Alpha Omega Instruments
Corp. also reserves the right to make any changes to improve the performance of its
products at any time and without notice.
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page i

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Series 800/850 Thermoelectric Cooler Controller Page ii

WARNINGS
To avoid the risk of fire or electrical shock, do not expose the outside surfaces of the
Series 800/850 temperature controller to rain or water spray.
WHEN POWERED, THE PRESENCE OF NON-INSULATED
DANGEROUS VOLTAGES WITHIN THE INSTRUMENT MAY BE OF
SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRICAL
SHOCK RESULTING IN INJURY OR DEATH. LEAVE ALL SERVICING
TO QUALIFIED PERSONNEL. REMOVE ALL POWER SOURCES
WHEN INSTALLING OR REMOVING SENSOR CONNECTIONS AND
WHEN CHANGING THE SENSOR SETUP.
RF DISCLAIMER
This instrument generates and uses small amounts of radio frequency energy, and
there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause interference to radio or television reception, try to correct
the interference by one of more of the following steps:
1) Reorient the receiving antenna.
2) Relocate the instrument with respect to the receiver.
3) Change the AC outlet of the instrument so the instrument and receiver are on
different branch circuits.
VENTILATION
DO NOT BLOCK ANY OF THE AIR VENTS LOCATED ON THE
SERIES 800/850 TEMPERATURE CONTROLLER,
THESE VENTS ARE CRITICAL FOR HELPING TO KEEP THE
COMPONENTS WITHIN THEIR OPERATING TEMPERATURE
RANGE. SEVERE DAMAGE TO THE INSTRUMENT MAY TAKE
PLACE IF AIR FLOW IS IMPEDED.
Caution Notes:
I. This controller must be installed and operated in accordance with the
instructions contained in this manual. Failure to do so may, in some
situations, defeat the protection schemes designed into this equipment and
could pose a serious haszard.
II. If the controller was configured for use with 208/240 VAC, 50Hz. AC power,
the instrument was shipped without a modular flexible powr cord. UL
regulations mandate that users supply their own power cord equipped with
the specific connector for that country. This will help to assure that the
power cord meets all the local regulations for the rated voltages, current, as
well as color codes for wires and marker threads in the cordage itself. The
controller requires a cordset rated for 250 VAC and 5 amperes minimum. The
equipment connector required is a standard IEC 60320-C13 to mate with that
on the controller.
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page iii

TABLE OF CONTENTS
112Appendix L: Trouble Shooting
101Appendix K: MODBUS Remote Terminal Unit (RTU)
93Appendix J: Technical Information
85Appendix I: General Purpose Interface Bus (GPIB)
77Appendix H: Thermistor Curves
73Appendix G: Ramp and Soak
71Appendix F: Main Menu Programming
65Appendix E: Front Panel Controls
63
Appendix D: 115 VAC to 230 VAC Operation (230 VAC users see pg iii)
61Appendix C: TECView Software
59Appendix B: Power Booster Modules
55Appendix A: System Configuration
Appendices
43
Section 5: Operation and Control of the Series 800/850 Thermoelectric
Cooler Controller
17Section 4: Temperature Sensor Selection & Setup
11Section 3: Series 800/850 Thermoelectric Cooler Controller Connections
7Section 2: Thermoelectric Cooler Controller Description
1Section 1: Thermoelectric Cooler Controller Specifications
iiiTable of Contents
iiAir Flow
iiRF Disclaimer
iiWarnings
iWarranty
Page
Number
Item
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page iv

Section 1.0
THERMOELECTRIC COOLER CONTROLLER SPECIFICATIONS
The following pages detail the specifications of the Series 800/850 Thermoelectric
Cooler Controllers. Each model includes the capability of adding a Power Booster
Module (PBM) which is simply another power supply without the display and sensor
interface. The PBM is controlled by the main controller and therefore only has control
I/O and TEC output connections.1
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 1
1Please refer to AppendixB for details on the Power Booster Modules (PBM).

SPECIFICATIONS FOR THE SERIES 800 THERMOELECTRIC COOLER
CONTROLLER
Two yearsWarranty
0°C to 50ºC (32°F - 122°F)Operating Temperature
Thermoelectric Cooler, AC Power, Power Booster ModuleI/O Connections
Thermoelectric Cooler, Temperature Sensor, AC Power, Power Booster
Module (PBM), optional EIA/RS-232/485 (using MODBUS1protocol)
I/O Connections
4.9” H X 7.2“ W X 10.6” LDimensions
12 pounds maximum (150 watt instrument)Weight
Two (2) FansInternal Cooling
115/230 Volts AC, internally selectable, 47 - 63 Hz.AC Power
Thermistor 100 Kohm range, 0 to 99.99K or 10 ohms
1 Megohm range, 0 to 999.9K or 100 ohms
For other sensors, such as RTDs, thermocouples, AD590/592 and
LM35/135/335 sensors, the resolution is 0.1 ºC.
Display Resolution
Thermoelectric Cooler temperature and set-point temperature in ºC or ºF
(user-selectable) with an RTD, thermocouple, AD590/592 and LM135/335.
For a thermistor, the display is in Kohms.
Display
Two 4 digit LED displays, RED - for actual temperature
GREEN - for set point temperature
Front Panel Displays
< 1 mANoise and Ripple
< 0.002º CLong Term Stability
Higher and lower temperatures can be measured depending upon the
sensor type. Please refer to Appendix A for details on the
temperature ranges available for each sensor type and an example of
a custom sensor type.
Thermistors can operate on one of two ranges (0 to 99.99 Kohms and 0 to
999.9 Kohms). Integrated temperature sensors (AD590/592 and
LM35/135/335) operate from: -50ºC to 150ºC.
Sensor Temperature Ranges for
Standard Sensors
100 ohm RTD, Types E, J, K, N, and T thermocouples, thermistor,
AD590/592, and LM35/135/335 as well as external voltage and current
inputs.
Temperature Sensors
30 W, 60 W, 90 W, 120 W, and 150 W.Maximum Output Power for
Controllers & Power Boost Modules
2, 4, 6, 8, or 10 amperes.Maximum Output Current
+15 Volts DC.Compliance Voltage
Uni-polar or Bi-polar, constant current, PID (Proportional, Integral,
Derivative) with Auto-tuning. User can select P, or P&I control only.
Control
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 2
1MODBUSis a registered trademark of Modicon, Inc., Industrial Automation Systems.

SERIES 800 FRONT VIEW (SHOWN WITH POWER BOOSTER MODULE)
SERIES 800 REAR VIEW (SHOWN WITH POWER BOOSTER MODULE)
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 3

SPECIFICATIONS FOR THE SERIES 850 THERMOELECTRIC COOLER CONTROLLER1
Two yearsWarranty
0° to 50 ºC (32° - 122°F)Operating Temperature
Thermoelectric Cooler, Temperature Sensor, AC Power, PBM, optional
EIA/RS-232/485 (using MODBUS protocol) and GPIB
I/O Connections
5.25” H X 19“ W X 15.9” LPower Booster Module Dimensions
5.25” H X 19“ W X 15.9” L (3U chassis height)Controller Dimensions
18 pounds maximum (300 watt instrument)Weight
Up to two (2) fansInternal Cooling
115/230 VAC, Internally selectable, 47 - 63 Hz.
AC Power
Thermistor 100 Kohm range, 0 to 99.99K or 10 ohms
1 Megohm range, 0 to 999.9K or 100 ohms
For other sensors, such as RTDs, thermocouples, AD590/592, and
LM35/135/335 sensors, the resolution is 0.1 C
Display Resolution
Thermoelectric Cooler temperature and set-point temperature in ºC or ºF
(user selectable) with an RTD, thermocouple, AD590/592 and
LM35/135/335. For a thermistor, the display is in Kohms.
Display
Two 4-digit LED displays - red for actual temperature, and green for
set-point temperature
Front Panel Displays
< 1 mANoise and Ripple
< 0.002ºCLong Term Stability
Higher and lower temperatures can be measured depending upon the
sensor type. Please consult the factory.
RTD’s thermocouples, thermistors (0 to 100 Kohm and 0 to 1 MEgohm),
and active sensors AD590/AD592, and LM35/LM135/LM335 (-50ºC to
150ºC typical)
Range of Sensors
100 ohm RTD, Types E, J, K, N, and T thermocouples, thermistor,
AD590/AD592, and LM35/lm135/lm335 as well as external voltage and
current inputs
Temperature Sensors
Up to 300 wattsMaximum Output Power For
Controllers & Power Boost Modules
Up to 20 amperesMaximum Output Current
15 VDCCompliance Voltage
Uni-polar or Bi-polar, constant current, PID with Auto-tuning. User can
select P, or P&I control only.
Control
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 4
1The Series 850 Thermoelectric Cooler Controller can also be configured as a Power Booster Module

SERIES 850 FRONT VIEW
SERIES 850 REAR VIEW
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Series 800/850 Thermoelectric Cooler Controller Page 5

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ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 6

SECTION 2.0
THERMOELECTRIC COOLER CONTROLLER DESCRIPTION
Both the Series 800 and Series 850 Thermoelectric Cooler Controllers represent a
significant advance in the state-of-the-art of thermoelectric cooler (TEC) controllers. It
is no secret that in the past, TEC controllers required a significant amount of hands-on
operation to provide satisfactory performance, particularly when variations in the load
and/or environmental conditions existed. The Series 800 / 850 TEC Controllers utilize
advanced control technology in combination with auto-tuning capabilities to provide
un-precedented performance. The Series 800 is designed for bench-top use with the
Series 850 is configured for use in a 19” rack.
Ease of Use
The eloquence of the Series 800 / 850 TEC Controllers are their ease of use. The
Series 800 / 850 TEC Controllers feature a user-friendly front control panel containing
four (4) switches that allow access to the instrument’s control settings. In addition,
there are two (2) LED digital displays that simultaneously display both actual
temperature and set-point temperature. Each controller features proportional, integral,
and derivative (PID) control that provides exceptionally tight control over a wide
temperature range, as well as rapid response to changes in operating conditions. The
auto-tuning feature helps to insure maximum performance over a broad spectrum of
operating conditions. Auto-tuning sets the critical PID terms to match the conditions of
the application and provides fast response while minimizing overshoot and
undershoot. From the user’s perspective, the need to make frequent manual
adjustments has been virtually eliminated. For unique applications, users have the
option to manually adjust the instrument’s control parameters as desired.
Maximum Versatility
The Series 800 and Series 850 TEC Controllers accept a variety of temperature
sensors including 3-wire, 100 ohm RTDs. Use of a 3-wire RTD helps to eliminate
measurement error caused from unaccounted changes in sensor cable lengths.
Another feature of the Series 800 / 850 TEC Controllers is that users can choose to
operate in either the bipolar (heat and cool) or unipolar (heat or cool) mode. In the
bipolar mode, heating and cooling limits can be set independently of each other,
helping to ensure that temperature limits are not exceeded. In addition, the controllers
incorporate current limit adjustment to protect TEC modules from damage due to
excess current. Current levels for the heat and cool modes can be set independently,
thus offering maximum protection to TEC modules and peripheral equipment. The
front panels contain LEDs to indicate when the instruments are in the heat or cool
mode.
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 7

POWER
Series 800
The Series 800 TEC Controller has five (5) standard output power ratings:
10 A @ 15 VDC150 Watts
8 A @ 15 VDC120 Watts
6 A @ 15 VDC90 Watts
4 A @ 15 VDC60 Watts
2 A @ 15 VDC30 Watts
Series 850
The Series 850 TEC Controller has six (6) standard output power ratings
20 A @ 15 VDC300 Watts
10 A @ 15 VDC150 Watts
8 A @ 15 VDC120 Watts
6 A @ 15 VDC90 Watts
4 A @ 15 VDC60 Watts
2 A @ 15 VDC30 Watts
Power Booster Module
Alpha Omega Instruments has gone beyond the conventional approach to powering
TECs by developing a unique Power Booster Module for each of its TEC controllers.
Users can increase the output power of their Series 800 / 850 TEC Controller by
adding one or more Series 800 or 850 Power Booster Modules. Depending upon the
number of Power Booster Modules added, the output power of the controllers can be
doubled, tripled, or even quadrupled. The additional power available through the
Power Booster Modules can go into the kilowatts. And, regardless of the number of
booster modules used, they along with the controllers, are driven from one
temperature sensor, thus ensuring uniform temperature control. The Series 800 and
850 Power Booster Modules can be easily installed in the field.
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 8

STANDARD FEATURES
Temperature Alarm Relay
The Series 800 / 850 TEC Controllers are equipped with a temperature alarm relay,
configurable by the user as a high alarm, low alarm, or both a high and low alarm.
This capability is important when the user needs to insure that the temperature of the
TEC being controlled does not exceed specific limits. Section 5.0 provides details on
setting the alarms.
Soft Start
The Series 800 / 850 TEC Controllers are equipped with soft start so that upon
power-up, potentially dangerous current spikes that could be delivered to the TEC are
eliminated.
SERIAL COMMUNICATIONS OPTIONS
The Series 800 / 850 TEC Controllers can be equipped with optional EIA/RS-232 or
EIA/RS-485 Serial Communications utilizing the MODBUSprotocol.
GPIB INTERFACE OPTION (SERIES 850 CONTROLLER ONLY)
The Series 850 TEC Controller can be equipped with an optional General Purpose
Interface Bus (GPIB) interface in accordance with the IEEE-488-2 specification.
Standard Commands for Programmable Instruments (SCPI) are also supported.
TECVIEW SOFTWARE OPTION
When a user chooses one of the available serial communications options, the user can
purchase Alpha Omega Instrument’s proprietary TECView software that is compatible
with most Microsoft®Windows®operating systems. TECView provides a user-friendly
graphical interface for remote operation of the Series 800 / 850 TEC Controllers via a
personal computer (PC). Date storage, formatting for use with spreadsheet programs,
etc., can be easily done from a PC using TECView.
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ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 10

Section 3.0
SERIES 800/850 TEC CONTROLLER CONNECTIONS
The following section explains the hardware connections on the Series 800/850
temperature controllers.1
REAR PANEL ITEM DESCRIPTIONS
Heat Sink Do not block the flow of air coming out of the holes in the heat sink on the
rear of the controller.
çHigh temperatures may result from poor load
matching or a short on the output while calling for
full output. Be careful not to hold the fins on the
heat sink too long in these situations.
There are two heat sinks on the rack mounted controllers if the power of
the instrument exceeds 150 Watts.
Control I/O Located on the rear of all controllers and Power Booster Modules (PBM) are two
six conductor RJ-11 connectors. Use the “CTRL OUT” connector to control the
“CTRL IN” of a PBM.2When using a PBM, the connecting cable will be supplied
EIA/RS-232/-485 Use this connector to access additional options such as EIA/RS-232 or
EIA/RS-485 communications. Please refer to Appendix J, Technical
Information, for wiring details.3
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 11
3For special applications please contact the factory.
2At this time the main controller does not support the “CTRL-IN” connector. This is for future use and should not be used.
1Please note: There are a number of possible connections to theSeries 800/850 temperature controller. Refer to Appendix J,
Technical Information for more details if necessary.

AC power input The AC power connector is located on the rear panel with the fuses
located in the receptacle. Check the ratings on the fuse for the correct
ratings, and only install replacement fuses with the correct rating. A six
(6) foot modular power cable is supplied with each instrument
Power Switches The power switch is located on the rear of the Series 800 TEC
Controller. The Series 850 TEC Controller has the power switch located
on the front panel.
Connecting the Sensor Input Connector
The first connection to make is the sensor mating connector. The wiring and
controller setup procedure is detailed in the next section of this manual
(Section 4.0).
Locate the sensor input mating connector supplied with the instrument labeled
SENSOR and push the sensor mating connector into the 3 holes. The connector is
polarized - one pin is larger than the other two, and allows three connections to be
made between the sensor and the instrument. To access the screw terminals simply
remove the cover to expose the terminals of the connector.
This is a pictorial of the connector looking down while connected into the SENSOR
input connector of the TEC controller. The connector is shown partially engaged to
show the larger polarizing terminal. A thermistor is show here as an example.
NEG
POS
GND
Thermistor
Mating Connector
Cover
TEC
Controller
Optional GPIB Interface Connector
See Appendix I for more information on the GPIB Interface.
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 12
Fuse(s)

TEC Power Output Connector
The Second connection to be made is to the TEC.
çMake sure that the sensor is properly wired, the
controller is properly programmed, and the power is
OFF before connecting the TEC. See Section 4.0 for
details on the sensor setup.
Make sure the Series 800/850 temperature controller is OFF before connecting the
TEC to the TEC power output connector.
After locating the TEC power output connector on the rear panel of the Series 800/850
temperature controller, locate the mating connector supplied with the instrument. This
mating connector has screw terminals that allow the TEC leads to be clamped down
within the connector.
Connect the TEC to the mating connector.
There are two “+”’s and two “-”’s. Each pin can carry a maximum of 10 amperes. With
the Series 850 TEC Controller, if the current rating is over 10 amperes, then both pins
must be used to carry the current (the Series 800 is designed to deliver a maximum of
10 amps). Please remember that for currents over 8 amperes, AWG #14 size wire is
recommended. See diagrams below for various configurations:
10 amperes MAX
TEC
Keyed Connector
10 amperes MAX
10 amperes MAX
TEC
Keyed
10 amperes MAX
10 amperes MAX
Connector
20 amps
20 amps
10 amperes MAX
10 amperes MAX
TEC 1
Keyed
10 amperes MAX
10 amperes MAX
Connector
20 amps
20 amps TEC 2
Once the TEC leads are securely fastened into the mating connector, plug this
connector into the TEC Power Output connector. If the Sensor is configured according
to Section 4.0 and the TEC is properly connected, all that’s left is to turn on the Series
800/850 temperature controller.
Caution: Before applying power to the TEC, the user is responsible for ensuring that
the TEC(s) have proper heat sinking. If questions arise regarding heat sinking, it is
strongly advised that you contact the supplier of the TEC module for further guidance.
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 13

TEC WIRING
If the temperature should go in the “wrong” direction, check to make sure that the TEC
is configured as shown below:
Also, if using a thermistor as shown, the Series 800/850 temperature controller will
display Kohms on the display. This means that when the temperature increases, the
Kohms will decrease. Hence, the reason they call it a “NTC” (negative temperature
coefficient) thermistor.
Definitions
The Series 800/850 thermoelectric cooler controller is designed so that Channel 1
output is always supplying cooling power. This means that positive voltage will appear
at the positive output of the Series 800/850 TEC Controller when cooling. To avoid
any misunderstanding or problems, the following terms have been defined (please
refer to Figure 2.2):
+ CoolingPositive voltage is applied to the positive terminal of the
thermoelectric cooler (TEC) originating from the positive
output terminals of the Series 800/850 TEC Controller.
+ HeatingPositive voltage is applied to the negative terminal of the (TEC)
originating from the negative output terminals of the Series
800/850 TEC Controller.
+ Cold Side The side of the TEC that is opposite the side where the
leads are attached to the ceramic plate. This is the
controlled side where the temperature sensor should be
located.
+ Hot Side The side of the TEC where the leads are attached to
the ceramic plate. This is the side which should be mounted
to a heat sink (consult the manufacturer of the thermoelectric
cooler if selection of a heat sink is required).
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 14
Thermisto
r
Heat Sink
TEC

CHECKLIST
;Never connect either of the thermoelectric cooler leads to ground! This results in excessive current to flow
causing possible damage to the cooler. Note: slightly overrated fuses have been installed in the Series
800/850 TEC Controllers that should protect the TEC against most faults. However, there is no guarantee.
See Chapter 3 for details on the fuse.
;Never put a direct short across the thermoelectric cooler leads when power is applied. This will cause
excessive currents to flow and could generate a significant spark.
;Always set the output Current Limit(s) of the Series 800/850 TEC Controllers to approximately 10% less than
that specified by the manufacturer of the thermoelectric cooler.
;Caution: If a thermoelectric cooler melts down due to excess current in all likelihood it will become a direct
short. Note: Current to the thermoelectric cooler can be adjusted by using the Current Limit settings:
[IL`A], [IL`b] and [ILSP]. See Chapter 5 under “Detailed Parameter Descriptions” for details.
INSTRUMENT FUSES
Series 800
The Series 800 TEC Controller is equipped with a 5 Ampere 250 Volt AC Line fuse
within the modular AC Input receptacle. If the Instrument does not power up when the
power switch is turned ON, or ceases operation while powered ON, place the power
switch in the OFF position and remove the modular AC Power Cord. Access the fuse
holder by prying the fuse holder open gently with a small screwdriver. Once the fuse
is removed, measure the continuity of the fuse with an ohmmeter. If the fuse is failed
(open), be sure to replace it only with a fuse of the same rating (5 Ampere 250 Volt,
Instrument rating). If the fuse continues to fail in operation, please contact the factory
about returning the unit for service.
The Series 800 TEC Controller is also equipped with a fuse mounted at the rear of the
analog controller PCB, providing protection for the TEC load. Since each Series 800
TEC Controller can be configured for different amounts of load current, this fuse will be
different for each configuration. If power is not being delivered to the TEC and this
fuse is suspected, place the power switch in the OFF position and remove the modular
AC Power Cord. Then remove the instrument cover, and access this fuse by rotating
the fuse cover 180 degrees with a small straight bladed screwdriver. Please be sure
to replace a failed fuse only with a value consistent with the load rating of the
instrument and the TEC you are using. Replace the instrument cover, and insert the
modular AC power cord into the receptacle. Check your instrument connections, and
turn the power ON. If this fuse continues to fail under load, insure that the
replacement fuse you insert is equal to or slightly greater than the rated load of the
instrument, and check the current limit programming of the instrument controller. If the
problem persists, please contact the factory.
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 15