Engine and Transmission Test Stand

Machine with an opposing motor used to test engines or tranmissions by loading them at different speeds.

Fast Facts



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Required Drive Features    Motor Control Type    Regulation Type   

Required Drive Features

4 Quadrant Line Regeneration (Movie) (swf, 0.02 MB)

Some applications have significant inertia that 'overhauls' the motor or layouts that allow gravity to accelerate the load faster than the commanded speed, causing energy to be sent back to the drive. The Line Regeneration feature allows the drive to send that energy back to the incoming line supply.
Requires: A 4-Quadrant Drive.

Closed Loop

Applications often require a precise measurement of load speed. Typically, an encoder is mounted to the motor shaft and its signal is used to indicate shaft speed. The drive can then adjust its output to the desired condition. Closed loop offers the highest accuracy and performance.
Requires: A drive with feedback capability, either as standard or as a plug-in option card.

Common Bus

Applications that involve multiple drives in a coordinated system often benefit from a common bus configuration. Drives are connected via their DC bus rather than the AC line. It allows energy to be shared between drives and reduces the number of components.
Requires: A drive that has the DC link terminals available and have been tested for common bus.


Applications that involve multiple drives or drives controlled by PLC or other supervisory device often require communications via a defined network.
Requires: A drive that has a standard or optional connection to the desired network.

Critical Avoidance

Some applications have mechanical resonance points that cause the mechanics (shafts, belts, etc.) to oscillate. These oscillations can rapidly cause mechanical failure.
Requires: A drive that, through programming, can assure that these critical speeds are 'skipped' over and avoided.

Digital I/O

Each application has specific requirements for I/O. Digital I/O is generally used to control the drive (Start, Stop, Jog, etc.) and annunciate the drive status.
Requires: A drive that offers sufficient I/O and needed flexibility to perform all required func¬tions.

Dynamic Brake

Applications that require rapid deceleration or quick stops can regenerate energy back to the drive. A dynamic brake dissipates this energy through a resistor as heat.
Requires: A drive that has an internal DB chopper and connectable resistor or has an external DB kit.

Dynamic Response

High performance applications often demand nearly instant response to changes in speed or torque commands or input status changes. The higher the dynamic response, the more capable the drive is in meeting these demands.
Requires: A drive that meets the response demands.

Overload Torque

Applications may require varying degrees of overload capacity for starting, accelerating, or intermittent duty. This overload capacity must be supplied by the drive as current and by the motor as torque.
Requires: A drive that has sufficient overload capacity.

PID Loop

An internal function provides closed loop process control with proportional, integral and derivative (PID) control. The PID function reads an analog input to the drive and compares it to a desired setpoint. The PID loop adjusts the drive output frequency (and therefore the process) to make the input value equal the setpoint.
Requires: A drive with one or more internal PID loops to eliminate the need for external hardware.

Position Regulation

A feedback device on the motor or machine, typically an encoder or resolver, feeds position information to the drive. The drive compares this information to a desired setpoint and adjusts its output to place the load in the desired position.
Requires: A drive that offers this control method when positioning without a separate positioning controller is needed.

Slip Compensation

A squirrel-cage motor slips under load. To compensate for this, the frequency can be increased as the motor torque increases.
Requires: A drive that provides adjustable slip compensation.

Speed Range (100:1)

All applications operate over a given speed range, defined as the ratio of maximum continuous speed to minimum continuous speed.
Requires: A drive that can produce the needed torque and speed torque regulation (accuracy) over the required speed range.

Torque Proving

Some applications, like cranes, hoists and elevators, use mechanical brakes to hold the motor and driven machinery stationary while the drive is stopped. Prior to the release of this brake, the drive senses adequate current supplied to the motor to prevent dropping the driven machinery when the mechanical brake is released.
Requires: A drive that provides torque proving.

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Motor Control Type

Flux Vector Motor Control

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Regulation Type


Applications that depend on accurate torque to accomplish the task require a drive that can control or 'regulate' torque. These applications typically control tension or force to produce a high quality product. The motor slip plus magnitude and phase angle of the output current are controlled to produce the commanded torque.
Requires: A drive that offers this motor control method when torque control is required.

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