... 3. Double DSP controller .... Features:1. Three phase in and out system, compatible with utility of ... high overload capability4. Fully digital control with three DSPs including IGBT rectifier, inverter, charger5. Digital ... 3Hz, adjustableFrequency precision (free running)±0.01%Phase tolerance120°±0.5° (balance and unalance ... 20us higher than 6KV/3KA Three Phase High Frequency Online UPS HT33 10-200K