NORDAC vector mc frequency inverters are microprocessor-controlled, voltage-source d.c. link inverters designed to control three-phase asynchronous motors. Outputs range from 250 W to 2.2 kW (1 AC 220 ... 240 V), and from 0.75 kW to 3.0 kW (3 AC 380 ... 460 V). Many different control modes and options, drive control at highest efficiency, convenient operation, moderate space requirement and high operational dependability are the most distinctive features of these frequency inverters. The no-sensor vectorial current control system (also referred to as ISD mode of control) enables the inverter to calculate, on the basis of a motor operation simulation program, by which amount output voltage and frequency have to be modified for the desired motor speed to remain constant while load conditions are varying.
Basic features
As a result of ISD control, a high starting torque can be provided
High precision of motor speed control owing to slip compensation
Convenient installation, programming, and starting-up
Two differently sized housings, both compact
No clearance required for installation side by side
Ambient temperature up to 50°C allowed
Integrated line filter for limit curve A
Allows for control via serial RS 485 interface
Stator resistance is measured automatically
Two separate parameter sets which are switchable without interrupting the inverter-motor connection
Setpoint setting via 0 to 10 volt, (±10 volt, 0/4 to 20mA optionally), fixed frequencies, or bus
Two programmable relay outputs
D.C. braking programmable
Integrated braking chopper for 4-quadrant operation
Adjustable ramp smoothing
Scalable analogue output, 0 to 10 volt
Detachable parameterisation and display module
Clear text display and data storage function
Single-phase vector mc devices also available in a low leakage current execution
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