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Introduction to
Getting Started
In the past, AC variable speed drives used an open loop (scalar) technique to control speed. The
Output voltage
V
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Today, with the advent of sophisticated microprocessors and digital signal processors (DSPs),
it is possible to control the speed and torque of AC induction motors with unprecedented accuracy. The L100 utilizes these devices to perform complex mathematical calculations required to achieve superior performance. You can choose various torque curves to fit the needs of your application. Constant torque applies the same torque level across the frequency (speed) range. Variable torque, also called reduced torque, lowers the torque delivered at
The Hitachi L100 Series of inverters includes two
TIP: If your application only has single phase power available, refer to L100 inverters of 3HP or less; they can accept single phase input power.
The common terminology for single phase power is Line (L) and Neutral (N). Three- phase power connections are usually labeled Line 1 (L1), Line 2 (L2) and Line 3 (L3). In any case, the power source should include an earth ground connection. That ground connection will need to connect to the inverter chassis and to the motor frame (see “Wire the Inverter Output to Motor” on page