QM20TD-H For 3 Phase Inverter

[Dr471e]

does everyone understand about QM20TD-H device?
i use QM20TD-H for my 3 phase inverter. but, i have a problem. the output voltage of my 3 phase inverter is always same with the trigger voltage. it can't increase.
does everyone have a solution?

 

[Hero999]

http://pdf.dzsc.com/QM2/QM20.pdf

What's the trigger voltage?

Post a schematic.