
I am comparing the currents in the start of a motor that controls a fan. I am going to test DOL, star-delta, softstarter and a Frequency converter. It is a 3-phase motor on 5.5kW, 400V, and takes about 7.3 ampere when it is running.
I have so long only tested DOL and the softstarter, but when I look at the current and the voltage on the softstarter I get a bit confused. It is a Siemens Sirius softstarter, model number 3RW3024-1AB14
https://mall.automat...08-&jumpto=6008
I have read that the soft starter is supposed to reduce the current and the torque. But when i look at the currents my meter shows about 50 ampere, and have a peak about 63 ampere. Thats only about 15 ampere less than the DOL-start. So it doesn't look like it is reducing the currents...? Anyone have a clue why it is like that?
And my second question; Isn't the softstarter suppose to work like in this picture?:

(from a ABB-pdf)
My current looks a bit like it:

But what about the voltage, that is supposed to look like the picture from ABB? Can anyone explain what I see in this picture

