FR S520S inverter reverse frequency problem

Hi Guys,

I am using FR S520S 0 2k EC mitsubishi and when I run the motor forward, the frequency is the same with my analog output but when I run the motor in reverse, the motor is just constant to 25Hz. I tried just a simple forward and reverse motor program and I just set the analog output in "monitoring watch" and the problem still exists. Motor forward frequency follows the analog output of plc while in reverse the frequency is just constant to 25 Hz. How can I solve this?

It may be that a fixed speed (25hz) is programmed to the reverse control input. This can easily happen since many drives permit multiply terminal assignments.

DickDV said:

It may be that a fixed speed (25hz) is programmed to the reverse control input. This can easily happen since many drives permit multiply terminal assignments.

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That's the first thing that I thought of too.