AC-LVDT Controller, Dual Channel Harold G. Schaevitz LLC (DMC-A2 Series)

Description

The DMC-A2 Series Dual Channel AC LVDT Controller is an accurate, high performance, programmable dual channel controller that delivers precise measurement and control for applications using AC LVDT (Linear Variable Differential Transformer) inputs. The 6-digit alphanumeric LED display provides easy to follow setup prompts for all LVDT parameters using the intuitive scrolling text configuration menus.

Used in conjunction with AC LVDTs, DMC-A2 Series Controllers make up a comprehensive, reliable, measurement system. The combination can be applied to a wide variety of demanding measurement applications, such as in process gaging in automated assembly machinery, differential measurements in thickness gaging, and other comparative measurements. Utilize the controller's PLC capabilities in conjunction with the standard relays and you have an economical solution when you need control functions for comparative and direct measurements in smaller automated systems.

The DMC-A2 Series Dual Channel AC LVDT Controller is designed to be upgradeable for expansion of capabilities. You can order the controller with the standard features and if at a later time you wish to add an option like Ethernet, to add communication to data acquisition software, it can be done at the factory.

The LVDT input module of the DMC-A2 Series Dual Channel AC LVDT Controller is designed to drive and condition the signals from two AC LVDT transducers. The module contains two high-speed micro controllers and a 16-bit dual channel A/D converter. It communicates with the selected controller internally via the .2C data bus. One of the micro controllers generates the sine wave for the AC LVDT excitation frequency. These frequencies are produced as multiples of the line frequency (either 50 Hz or 60 Hz that is selectable via the scrolling text menus).

Up to 16 excitation frequencies are available and are selected using the scrolling text menu in the controller setup. The 16-bit A/D converter has over 130 dB noise rejection at the excitation frequencies and is capable of 40 Hz averaged output on 45 samples. Scrolling text menus provide quick access to a range of configuration modes for easy AC LVDT application setup.

If you require a single sensor. We also offer a Single Channel LVDT Indicator model number DMI-A1.

Call The Sensor Connection Technical Sales Department at 248-417-2622 for more information and ordering details or send us an e-mail.

GENERAL SPECIFICATIONS
Tech Bulletin

General

Digital Display: 14-segment alphanumeric, 0.56” (14.2 mm) LEDs
Display Color: Red
Display Range: -199999 to 999999.
Display Update Rate: 1, 4, 10, or 20 times per second
Display Dimming: 8 brightness levels. Front panel selectable.
Scrolling Display Text Messaging: Full alphanumeric text characters supported.
Polarity: Assumed positive. Displays – negative.
Annunciators: 6 red LEDs on front panel; one per setpoint.
Front Panel Controls: PROGRAM, UP and DOWN buttons.

Power Supplies

Standard high voltage AC / DC power supply 85-265 V AC /
95-370 V DC
or
optional low voltage AC / DC power supply 18-48 V AC / 10-72 V DC

Environmental

Operating Temperature: 0 to 50ºC (32ºF to 122ºF).
Storage Temperature: -20ºC to 70ºC (-4ºF to 158ºF).
Relative Humidity: 95% (non-condensing) at 40ºC (104ºF).

Mechanical

Case Dimensions: 1/8 DIN, 96x48 mm (3.78” x 1.89”).
Case Depth: 137 mm maximum (5.39”).
Case Material: 94V-0 UL rated self-extinguishing polycarbonate.
Weight: 11.5 oz (0.79 lbs), 14 oz (0.96 lbs) when packed.

Approvals

CE: As per EN-61000-3/4/6 and EN-61010-1

LVDT Input Module

Excitation Voltage: 3 V RMS sine wave, zero DC component THD <2% (1.2 kHz).
Excitation Frequency: x 16 selectable frequencies available (1.2 kHz to 11.5 kHz.) Cristal locked, software driven.
Temperature Coefficient: ± 50 ppm/° C of full scale (typical).
Dual LVDT Inputs: 30 kW input impedance. Synchronous demodulation of excitation carrier. >130 db rejection of excitation carrier.
Frequency Response: 500 Hz (–3 db) low-pass filter.
Analog to Digital: Dual channel SD A/D convertor approaching 19-bit resolution. Ratiometric operation relative to excitation voltage magnitude.
Dual Output Rates: Rapid and average response outputs. 1 Hz, 2 Hz, 10 Hz, 20 Hz, 40 Hz averaged.
Line Frequency Rejection: 50 to 60 Hz noise rejection

Relay Output Modules

Plug into carrier board from rear:

1. Four Relay Module: Available with four 5 A Form A Relays*.
*Form A Relay Specifications: 5 A 240 V AC, 4 A 24 VDC.
Isolation 3000 V. UL and CSA listed.

2. Two Solid State Relay (SSR) Module: Available with two independent (210 mA DC only) or (140 mA AC/DC) SSRs (400 V max).

LVDT Position Sensors by