AC DRIVES - 6 OR 12 PULSE UP TO 4000 HP

M&I’s compact designed, AC variable speed Drives
(variable Frequency Drives) utilize a roll out power module design. Air cooled units are provided from 270 Amp to 2200 amp and water cooled through 4000 amps. Some of the features include:

• Advanced AC drive technology utilizing Eaton FX9000
Seventh generation technology
• High speed fiber optic communication between drives
(12 Mbit/second)
• Compact design, 1200 amps only 32” wide, 30” deep
cabinet size
• Over voltage and under voltage stall protection
• Ambient compensated, auto power reduction upon over
temperature and overload
• Communication capabilities include Ethernet, Device
net, Profibus, & CAN bus
• Voltage capability through 690 VAC
• Roll out power module design for quick change out.

Protective Features

• Overvoltage Protection
  • Undervoltage Protection
  • Ground Fault Protection
  • Motor Phase Supervision
  • Overcurrent Protection
  • Unit Overtemperature
  Protection
  • Motor Overload Protection
  • Motor Stall Protection
  • Motor Underload Protection
  • Short Circuit Protection of
  +24V and +10V Reference
  Voltages

Performance Features

• Ratings: 300 to 1500 HP at 460 VAC
  450 to 2200 HP at 690 VAC
  • Overload: 150% for 60 sec
  • Peak Current: Is for 2 sec every 20 sec
  • Output Frequency: 0-320 Hz
  • Control Method:
  Frequency Control V/f
  Open Loop: Sensorless Vector Control
  Closed Loop: Frequency Control
  Closed Loop: Vector Control
  • Ambient Operating Temperature
  -10° C to 40° C: IH
  -10° C to 40° C: IL

M&I’s Drives feature a standard non-regenerative front end that can easily support a multi-pulse configuration for reduced harmonics. A fully-regenerative front end is also available as an option. Our AC Drives are available in both
a single and multiple VFD configurations with common DC bus for multiple inverters.

The inverter mechanically consists of two units, the Power Unit and the Control Unit. The Power Unit contains an inverter bridge which consists
of IGBT switches and produces symmetrical, three-phase PWMmodulated AC voltage to the motor.

The control unit is a high performance
microprocessor with keypad and PC serial interface. The microprocessor controls the motor based on the information it receives through
measurements, parameter settings, control I/O and the control keypad. The motor and application control block controls the motor control ASIC
which, in turn, calculates the IGBT states.

Gate drivers amplify these signals for driving the IGBT inverter bridge. The control keypad constitutes a link between the user and the inverter. The control keypad is used for parameter
setting, reading status data and giving control commands. It is detachable and can be operated externally and is connected via a cable to the inverter. Instead of the control keypad, a PC can be used to control the inverter if connected hrough a similar cable.