Dyn-Loc IV Digital Dynamometer Controller

Precise, Repeatable Control Since 1982

Front of Dyn-Loc 4 Dynamometer ControllerDyn-Loc 4 remains the engine and motor test industry's favorite single-loop digital dynamometer control

The Dyn-Loc IV is designed to provide precise, repeatable and stable Eddy Current and DC dyno test control. Digital control gives you quick, accurate selection of setpoints and zero percent regulation and drift. Leverwheel switches assure fast input that's always on the numbers, and digital reference and feedback yield 100% repeatability, so your tests are consistent. Crystal oscillator-based setpoint and digital RPM and Torque control allow unmatched adjustment-free operation. Just make one adjustment for Current Limit at start up, and you're off and running.

Integrates With Test Systems

Image of back of Dyn-Loc 4 showing connections for inputs and outputsDyn-Loc IV is DyneSystems' fourth generation single-loop dyno controller and, along with its ancestors, has long been a standard tool for a loyal following of dynamometer users. It integrates seamlessly with automation, data acquisition, and cell safety systems. RS232, parallel, and analog interface options permit easy integration into your test cell computer system. Manual operation and load cell Span and Zero, using the digital setpoint switches and push buttons, offer easy and error-free operation.

Applications

The Dyn-Loc IV control enhances the performance and reliability of your engine and chassis dynamometers. Quick, easy interconnection is guaranteed to your computer (parallel, serial, or analog), DTC-1 throttle control, Eddy-Current dynamometer, or motoring dynamometer (AC or DC). (Or check out our preferred method of AC dyno control.)

Features

  • Crystal Oscillator Based Reference Generator
  • Up to 50 Hz Digital RPM and Torque Data
  • Internal Road Load Calculation Option
  • Precise Digital RPM and Torque Control
  • Up to 115KB RS232 Interface for Precise Control and Data Acquisition
  • Zero Transient Transfer from RPM to TQ to RPM Control
  • RS232 and Hardware Links to DTC-1 Digital Throttle Control for Quick System Integration
  • High Resolution Computer-Controlled Data Displays for RPM, Torque, and Power
  • Rugged, Reliable Servo Loops for Accurate Control with a Minimum of Tuning Time
  • 4SCR "Current Source" Regenerative Field Amplifier Provides up to 16A, 220VDC Eddy-Current Field Output. (Remote amplifiers up to 120 amps available.)

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Specifications

Control

The Dyn-Loc IV is a complete Eddy-Current control package and a "front end" for motoring systems. RPM/Torque setpoint frequency is based on .005% accuracy crystal oscillator. This provides Zero percent RPM or Torque regulation and drift from setpoint.

The Digital LAC (rate of change of setpoint) ranges from 39 to 5,000 units/sec. (optional X 1/10, ranges provide minimum LAC of 4 units/sec.). PID factors adjustable for optimum transient response and fast setup.

Standard range of RPM control from 50 to 9,999 RPM (others available). Torque control from 10 to 9,999 units.

A 4SCR regenerative Eddy-Current Power Amplifier delivers fast response and is field adjustable from 0.5 to 16A. Complete control of dynamometer, dyno status, and test data is achieved through the Dyn-Loc IV serial or parallel communication ports. No analog/digital/analog conversions are required since the Dyn-Loc utilizes digital data directly.

SERIAL COMPUTER CONTROL - Serial port software/hardware allows easier high level programming using easily discernible keywords. Standard RS232 voltage level definitions and ASCII format are used to talk to any computer equipped with a serial port. Standard data format: 1 start bit, 8 data bits, 2 stop bits, and no parity. Baud rates to 115 KB are DIP switch selectable. All Dyn-Loc functions and variables are accessible through this port.

PARALLEL COMPUTER CONTROL - Interconnection via ribbon wire/mass termination, or crimp pins. High Noise Immunity: CMOS input, plus 25 microsecond input filters. Control functions available through two sub D connectors. - 16 bit RPM or torque setpoint, or 8 bit LAC (bit selected) data input. - 16 bit RPM or Torque (bit selected) data output. - 9 output status bits (important mode and condition data). 7 input bits (modes, data input type, data output type).

Dyn-Loc IV Remote Control Unit

Dyn-Loc 4 remote control on pedestelREMOTE CONTROL UNIT - Pedestal-mounted controller same as Dyn-LocIV except does not include Auto Zero and Auto Span functions.

  • Provides mode control, setpoint entry and display
  • Identical to Master Unit in appearance, size, and function except AS, AZ, LAC, and shunt cal are not provided
  • Rack or bench mounting; pedestal floor stand or boom optional
  • Interconnection by 37 pin mass termination connectors, round ribbon

Auxiliary Control Inputs

  • Analog Reference Input: 0 to + 10 VDC = 0 to 10,000 RPM/Torque units; the Dyn-Loc may be jumper programmed to use this signal in Remote mode.
  • Analog Torque Feedback Input: 0 to + 10 VDC = 0 to 10,000 Torque units; the Dyn-Loc may be jumper programmed to use this signal.
  • Frequency Torque Input: 0 to 20,000 Hz = 0 to 10,000 Torque units; signal must be a square wave with maximum 60/40 unbalance.

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Instrumentation

  • Display data update period of 1/4 second
  • RPM, Torque, and Power displayed continuously to 30,000 units on 0.6" LED's. Software Torque filter of 1/2/4/8 seconds, TQ/HP units, and decimal place, configured by dip switch selection
  • Power calculated by microcomputer to 32 bit accuracy, 1 LSD (HP or watts)
  • Standard display units - Torque is displayed in Ft#, In#, and Nm. Power is displayed in HP and kW. Others available as specials
  • RPM Transducer - provisions for standard mag pickup or active digital type
  • Torque Instrumentation system for standard 2 - 3mV/V strain gage Load Cell
    • Load Cell Span and Zero performed by microcomputer from front panel push buttons. NO potentiometer adjustments
    • Integral computer-controlled load cell amplifier for Auto Span/Auto and Zero. Shunt Cal (+/- 50% unbalance), via front panel push button

Dyn-Loc IV Motoring Controls

  • Static regenerative designs to 1,000HP and to 600VDC
  • DYN-LOC IV Master Control Unit provides Operator/ Computer interface to motoring power unit
  • Wall or floor-mounted power amplifiers
  • Automatic switching between motoring and loading
  • Soft start under all conditions and/or setpoint

Manual Operation

Setpoint entry is accomplished with two sets of digital leverwheel switches, with "Active" set (operator "PB" selection) providing desired setpoint input. Front panel leverwheel switches and recessed push button control LAC input. Mode selections are made by using the illuminated momentary push buttons: RPM/TORQUE - Master/Remote/Computer - Dyne ON/OFF.

Enclosure

19" x 8.75" x 13" Rack/Pedestal/Desk Mounted  Color: ivory beige

Power Requirements

  • Input: 120/240VAC @ 0.1A, Control Power
  • 1/2A PCB fuse
  • 240/277VAC @ 16A maximum, Field Coil Power
  • Rear panel fuses, for field power
  • Field Output: 16A @ 220VDC; higher ratings available, using remote Power Amplifier

For More Information

  • View and print product brochures in PDF format
  • Request a no-obligation quote with our online quote form
  • Contact our sales department at the email address or phone number shown at the bottom of this page

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