H&H ACL series electronic AC loads

The ACL series of electronic AC loads

The H&H ACL series electronic loads are suitable for both DC and AC voltages up to a frequency of 1,000Hz. 1-phase and 3-phase models are available. Multiple single-phase units can be configured to a 3-phase in a parallel, star or delta configuration. There are also 3-phase models in one housing.

The clear 4.3″ touch screen makes operation clear and simple. Different waveforms are defined directly through the user interface, from phase angle and crest factor to harmonics and random current waveforms. Phase shift between load current and voltage is possible in combination with crest factor or phase angle control.

The measured values are numerically displayed for all channels/phases or are displayed in an oscilloscope-like way versus time in a graph. The automatic amplitude correction keeps the RMS value of the current constant, even with a variable crest factor.

Specifications of the ACL loads

These ACL series electronic AC loads are suitable for voltages up to 280Vrms or 500Vrms and can be used in CC, CR, CP and CV mode. With alternating current, the set waveform is applied to the charging current independently of the input voltage. In resistance mode, the current level and waveform depend on the level and waveform of the input voltage. In energy and voltage mode, the power or voltage regulated by software by adjusting the input current. Single phase units are available with power ratings from 500W to 22.4kW. The 3-phase models are suitable for power ratings from 3 x 1,400W to 3 x 8,400W.

In all operating modes, the ACL load can emulate charging profiles using the LIST function. Up to 300 setpoints of variable duration with corresponding rise and fall times are possible. Sampling times can be defined separately for each profile. Voltage and current are measured synchronously and stored with a time stamp. Different dynamic load profiles can be programmed in which the waveform itself can also be varied. For example, there is an arbitrary function for the realization of harmonic distortion, phase control currents and Crest factor.

Models ACL series electronic AC loads

All control functions of the ACL series electronic loads are also adjustable or controllable via the optional, galvanically isolated I/O port. The ACL series is standard equipped with RS-232, USB, LAN, GPIB and the CAN System bus for Master-Slave use.