1. OVERVIEW
The MICROMASTERS are a range of frequency inverters for controlling the speed of three phase AC motors.
Various models are available, ranging from the compact 120 W single phase input MICROMASTER up to the 7.5
kW three phase input MICROMASTER.
The inverters are microprocessor-controlled and use state of the art IGBT technology for reliability and
flexibility. A special pulse-width modulation method with selectable ultrasonic pulse frequency permits
extremely quiet motor operation. Inverter and motor protection is provided by comprehensive protective
functions.
Features:
• Easy to install, program and commission.
• Closed loop control using a Proportional, Integral (PI) control loop function.
• High starting torque with automatic starting boost.
• Remote control capability via RS485 serial link using the USS protocol with the ability to control up to 31
inverters.
• A comprehensive range of parameters is provided to enable the inverters to be configured for use in
almost any application.
• Membrane-type front panel controls for simple operation.
• Built-in non-volatile memory for storing parameter settings.
• Factory default parameter settings pre-programmed for European and North American requirements.
• Output frequency (and hence motor speed) can be controlled by one of five methods:
(1) Frequency setpoint using the keypad.
(2) High resolution analogue setpoint (voltage input).
(3) External potentiometer to control motor speed.
(4) Fixed frequencies via binary inputs.
(5) Serial interface.
• Built-in DC injection brake with special COMPOUND BRAKING.
• Integral RFI filter on single phase input inverters (MM12 - MM300).
• Acceleration/deceleration times with programmable smoothing.
• Fully programmable single relay output incorporated.
• External Options connector for optional multi-language Clear Text Display (OPM2) or optional PROFIBUS
module.
• Automatic recognition of 2, 4, 6 or 8-pole motors by software.
• Integral software-controlled cooling fan.
• Fast Current Limit (FCL) for reliable trip-free operation.
• Compact design and the ability to mount inverters side by side provides greater space saving.
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