Product Intro

The TTD70xx is a network-type 2/4/8-channel TEC temperature controller. It supports 1/2/4/8 channels of NTC thermistor temperature sensor input, 2/4/8 channels of cooling and heating output, and has a rated output current of up to 10-15A. The output is divided into two groups, each supporting 4-30V input, which can easily drive TECs of different power and voltage. It provides one upstream Ethernet interface and supports the standard Modbus TCP protocol.

Product overview

The TEC thermostat is a highly integrated temperature control device that combines temperature acquisition with bidirectional DC temperature control output. It can directly drive DC loads (such as TEC cooling elements), eliminating the cumbersome process of connecting external temperature sensors and solid-state relays. Based on the real-time acquired temperature value (PV) and the user-set target value (SV), the thermostat intelligently calculates PID control ratios and intelligently adjusts the output of the cooling/heating power devices using PWM to achieve precise temperature control. Furthermore, the device is equipped with a 100Mbps high-speed network interface for easy connection to a host computer and supports standard Modbus TCP/RTU communication protocols, ensuring efficient and compatible data transmission.

The device features precise temperature control, excellent stability, strong anti-interference capabilities, and multi-level over-temperature protection. The system includes built-in functions such as output cessation upon over-temperature alarm and output shutdown upon exceeding the control temperature upper limit, effectively protecting the safety of controlled items.

Device model list

Product features

Industrial design

⚫ High-performance industrial-grade 32-bit processor

⚫ Supports long-term stable operation in the -20~85℃ range

⚫ Aluminum alloy housing, resistant to electromagnetic interference

Reliability and stability

⚫ A watchdog timer ensures long-term system stability

⚫ A comprehensive protection mechanism ensures device stability

⚫ Built-in surge and ESD protection on the power input

⚫ Reverse polarity protection on the input power port and short-circuit protection on the load output channel

Ease of use

⚫ Device temperature acquisition uses pluggable terminals for easy maintenance

⚫ Plug-and-play support, eliminating the need for complex configuration

⚫ Communication uses the standard Modbus TCP/RTU protocol

⚫ A Type-C debug port on the front of the host facilitates debugging

⚫ Supports configuration management via host computer software (TSC)

Product features

⚫ Supports 4-channel NTC temperature acquisition and 4-channel control output (can directly connect to TEC cooling DC loads)

⚫ Supports Modbus TCP/RTU standard protocol and function codes 01, 03, 05, 06, 15, and 16

⚫ The thermostat host supports 100M Ethernet uplink communication

⚫ The thermostat's multi-channel design ensures a compact footprint

⚫ The thermostat features open PID parameter settings, supporting independent PID settings for each channel

⚫ The device features multiple over-temperature protection mechanisms and a load output disconnection alarm

⚫ Temperature control accuracy ≤±0.1°C, temperature accuracy ≤±0.5°C, and a resolution of 0.01°C

Technical Parameters

Device interface function.

TEC Thermostat Interface Definition and Description

Device port function

Common faults

During device use, some faults may occur, and the user can restore the normal operation of the

device according to the faults and solutions listed below. If the problem cannot be solved, please contact our company.

Power Failure

Symptom: After powering on, all panel indicators are off.

Troubleshooting:

1. Check the power supply wiring for proper connection and contact with the terminals.

2. Check the power cable for reverse polarity.

3. Use a multimeter to measure the input voltage to ensure it is within the specified range (12-36 VDC).

Communication Failure

Symptom: RS485 communication failure

Troubleshooting:

1. Check the device parameters for correct configuration.

2. Check the panel indicators for correct display.

3. Check the communication wiring for correct configuration. After ensuring the wiring is correct, check the communication parameters for correct configuration.

4. Check the 485 DIP switch address for the correct communication address with the host computer.

Abnormal Temperature Acquisition

Symptom: Abnormal Temperature Acquisition

Troubleshooting:

1. Check the temperature sensor wiring for correct connection.

2. Check the terminal blocks for tightness and no looseness.

3. Check the temperature sensor for proper contact with the object being measured. 4. Check that the connected temperature sensor model matches the device model.

5. Check that the register address and quantity read by the host computer are correct.