Acromag TT236-0600 - User Manual

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Overview

Technical Specifications
Usage Features
Maintenance Features

The Acromag TT236-0600 is an ANSI/ISA Type II transmitter designed to interface with DC Current (0-20mA/4-20mA) or Low Voltage DC (±0.5V/0-500mV) sensors. Its primary function is to isolate the input signal and modulate a 4-20mA current signal to drive a two-wire current loop. This device is configured and calibrated using dedicated software via a USB connection to a Windows-based PC (Windows XP or later). It offers an adjustable input range, input isolation, and variable input filtering.

Technical Specifications:

Input Types: Supports both process current input and DC voltage input on the same model.
- DC Current Input 1 (TB1): Configurable for 0-20mA, 4-20mA, 0-11.17mA, and ±1mA. Nominal input ranges can be rescaled for smaller ranges. A precision 24.9Ω current sink resistor converts the input current to a voltage for processing by the A/D converter.
- DC Voltage Input 2 (TB2): Configurable for ±0.5V and 0-500mV. This input has no resistive divider and a minimum input impedance of 15MΩ.
- Note: Only one input channel (current or voltage) can drive the output loop at a time.
Output: Transmits a 4-20mA current signal via a two-wire current loop. The output current is linear with the sensor current or voltage.
Accuracy: High measurement accuracy and linearity with 16-bit conversion.
Input Overvoltage Protection: Features Bipolar Transient Voltage Suppressers (TVS) with a typical 5.6V clamp level, differential input diode clamping, capacitive filtering, and series resistance.
Analog to Digital Converter (A/D): Utilizes a 24-bit, Σ-Δ A/D converter, normalizing the signal to a bipolar range count of ±25000.
Output Response Time: For an input step change driving 4 to 20mA into a 250Ω load with a 24V power, the response time varies with digital filter level:
- Low Filter: 50ms
- Medium Filter: 150ms
- High Filter: 1200ms
Output Power Supply: This device is a loop-powered output from 12-32V DC SELV (Safety Extra Low Voltage), 24mA maximum. The supply voltage must be at least 11V minimum to the transmitter, plus any IR drop.
Output Compliance and Load Resistance Equation: 11V minimum, transmitter. Unit will drive 13V typical to the load with a 24V loop supply and 20mA loop current (650Ω), assuming negligible line drop. Compute Rload (Max) = (Vsupply – 11V)/0.020A for 20mA full-scale output current.
Output Load Resistance Effect: Less than ±0.001% of output span effect for a ±100Ω change in load resistance.
Enclosure & Physical:
- Dimensions: 12.5mm (0.5 inches) wide, 99.0mm (3.90 inches) deep, 114.5mm (4.51 inches) high.
- Mounting: Designed for high-density mounting on T-type DIN rails (35mm, type EN50022), side-by-side on 12.5mm centers.
- Connectors: Removable plug-in type terminal blocks rated for 12A/250V; AWG #26-12, stranded or solid copper wire.
- Case Material: Self-extinguishing polyamide, UL94 V-0 rated, color light gray.
- Circuit Board: Military grade fire-retardant epoxy glass per IPC-4101/98.
- Shipping Weight: 0.5 pounds (0.22 Kg) packed.
Environmental:
- Operating Temperature: -40°C to +80°C (-40°F to +176°F).
- Storage Temperature: -40°C to +85°C (-40°F to +185°F).
- Relative Humidity: 5 to 95%, non-condensing.
- Installation Category: Suitable for Installation in Pollution Degree 2 environment.
- Shock & Vibration Immunity: Conforms to IEC 60068-2-6, 10-500 Hz, 4G, 2 Hours/axis, for sinusoidal vibration; IEC 60068-2-64, 10-500 Hz, 4G-rms, 2 Hours/axis, for random vibration; and IEC 60068-2-27, 25G, 11ms Half-sine, 18 shocks at 6 orientations.
Agency Approvals: CE Approved, FCC Conformity Class B, UL/cUL Class 1, Division 2 Approvals. Model TT236-0600 is ATEX/IECEx Certified for Explosive Atmospheres: II 3 G Ex ec IIC T4 Gc -40°C ≤ Ta ≤ +80°C.

Usage Features:

Digital Setup and Calibration: The device is digitally configured and calibrated using Windows-based software via a USB connection. This allows for precise adjustment of input ranges and other parameters.
Adjustable Input Ranges: Users can define specific input ranges, including rescaling nominal ranges for smaller spans, though this may reduce resolution and magnify potential error.
Variable Input Filter Adjustment: Selectable digital filtering levels (Low, Medium, High) can be applied to the input channel to reduce average noise, with a trade-off in I/O response time.
Two-Wire Loop Power: Convenient two-wire loop power with non-polarized output connections.
Namur Compliant Loop Current: Ensures compatibility with Namur standards.
Output Fault Detection: The inherent live-zero 4mA offset current provides built-in output fault detection if an output wire breaks.
Optional Sourced Output Wiring: Extra output connections support optional sourced output wiring configurations.
USB Connection: A USB MiniB socket on the front panel allows connection to a PC for configuration. An Acromag USB-ISOLATOR (or equivalent) is recommended to prevent ground loops and ensure safety, especially when connecting to grounded sensors or PCs.
Configuration Software: The Acromag Agility™ Config Tool App (available on Google Play Store for Android) or Windows-based software (included in the TT-SIP kit) is used for configuration and calibration.
- Device Selection: The software allows selection of the specific transmitter via its model and serial number, especially useful when multiple units are connected via a USB hub.
- I/O Config/Test Tab: Displays the unit's current configuration and allows users to make changes, retrieve current configuration, and test input polling.
- Calibration Tab: Provides controls for input and output calibration, including instructions for applying specific current or voltage levels.
- Factory Settings: Buttons to restore the transmitter to its original factory calibration or initial factory configuration (configuration only, not calibration).
- Input Scaling: Allows users to rescale the input range to drive the 4-20mA output, enabling the use of only a portion of the selected input range.

Maintenance Features:

Troubleshooting Guide: The manual provides a comprehensive diagnostics table to identify and resolve common issues, including:
- Software Detection Issues: Solutions for when the software does not detect the unit or the communication setup screen is blank (e.g., verifying USB cable connections, resetting the USB isolator).
- Communication Failures: Steps to address interruptions in communication or power (e.g., closing and re-opening the connection, rebooting software).
- Output Shifts/Errors with USB Connection: Explains how a missing USB isolator can cause ground loops, leading to output shifts or erratic behavior, and recommends using an isolator or a battery-powered laptop.
- Output Erratic/Wrong Value: Advises verifying loop voltage and ensuring the power supply is adequate for the load and maximum loop current.
- Cannot Calibrate Input Channel: Suggests checking input wiring for correct polarity.
- Loop Power Issues: Provides guidance on ensuring sufficient loop power for calibration and operation.
- Unit Drives Low Current: Steps to verify loop power supply voltage and ensure it can drive the full-scale current into the load.
- Incorrect Input Voltage/Current: Directs users to check input wiring to the correct terminals.
- Step Change Input Issues: Explains that the A/D converter needs multiple samples to charge up to its final value, which can cause a delay in output response.
- Output Goes to Over-Range: Suggests checking input signal respect to its range and reducing the input range if necessary, or investigating potential hardware faults like broken sensors or open output leads.
- Unit Holds Last Value: Recommends rebooting the configuration software or re-enabling the USB port if the unit holds its last value after initialization.
Service & Repair Assistance: Acromag's Application Engineers are available for technical assistance, and repair services are offered. The unit contains solid-state components and requires no maintenance, except for periodic cleaning and transmitter configuration parameter verification. The enclosure is not meant to be opened for repair.