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Festo 8857-1 IGBT Chopper/Inverter

Features

The IGBT Chopper/Inverter, Festo 8857-10, consists of 7 insulated-gate bipolar transistors (IGBT) mounted in a half-size EMS module.

Six IGBTs are used to implement choppers and inverters. These IGBTs are protected against a variety of severe operating conditions, such as short-circuits, overvoltage, over current, and overheat.

The seventh IGBT and an external dumping resistor allow smooth dissipation of excess energy at the DC bus. The dumping circuit can be activated using a toggle switch on the front panel.

The module switching control is performed through a DB9 connector that can directly receive 0-5 V TTL switching levels from any of the two 6-pulse inverter outputs available in OPAL-RT’s OP8219 module.

Six miniature banana jacks are provided as test points to monitor the switching control signals.

Specifications

• DC-bus ratings @ 120/208 V, 60 Hz

  • 420 V max

  • 10 A max

  • C=2520 uF

• Control signals

  • TTL levels 0-5 V

  • 0-20 kHz

• Minimum dead time: 700 ns

• Protections

  • DC bus Overvoltage 440 V, 10 A circuit breaker

  • IGBT Overcurrent 50 A, overheat 90° C

Festo 8540 4-Quadrant Dynamometer

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Features

Festo 8540 can act as a prime mover or as a four-quadrant dynamometer, and it can be coupled through a hard rubber gear to Festo 8505 Wound Rotor Induction Machine.
This dynamometer is based on a robust and reliable squirrel cage machine which is closed loop controlled by a Mitsubishi’s A-800 frequency inverter.

A touch screen panel is available to perform basic control of the dynamometer, i.e. manually setting speed and torque references; starting and stopping the dynamometer; monitoring torque, speed, and current; enabling computer-based control and reading system alarms.

When the computer-based control of the dynamometer is enabled, the user can have control over the Festo 8540 dynamometers through a half-duplex serial interface.
This serial communication allows full access to the basic and advanced configuration of Mitsubishi’s A-800 frequency inverter.
Additionally, users can manually configure the dynamometer through Mitsubishi’s FR-DU07 operation panel.
The reader is referred to Mitsubishi’s A-800 user’s guide included in the documentation CD.

Specifications

• Power requirements: three phases 208 V, 12 A

• Speed range: 0-3600 rpm

• Torque range: 0-12.18 Nm (0 to 8.98 lb·ft)

• Peak torque: 72 N·m (0 to 35.93 lb·ft)

• Rotation direction: clockwise (CW) and counterclockwise (CCW)

• Configuration/communication options: touch screen control panel, serial interface RS-485 (by removing the inverter front panel).

• 5000 W breaking resistor

Important Note

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When coupling the 8505 WRIM with the 8540 dynamometer to run the demos of this guide, make sure that the end of the 8505 having the label “This end to 8540” is coupled to the dynamometer, as shown in the figure.