Sinamics S120 Infeed fault: OFF1 enable missing

Bit Banger

We have another unit we were successfully able to commission in the same way, so I was able to verify the state of the leds, but thanks. The two units are wired up identically, so I have no reason to believe it's a hardware issue, though the unit I'm commissioning now is somewhat different in that it's larger (higher power), and the motor is an induction motor without a brake, versus the lower power unit that has a synchronous motor with a brake.

To run through the steps I've used to turn the unit on:

1. Apply +24V to the EP terminals on the line and motor modules.
2. Go to drive navigator->commissioning->allow motor to run.
3. Assume control priority.
4. Switch infeed on.
5. I can hear the sound of the switching transistors for a second or two, then the unit shuts down with the message "there is a fault in the infeed".

Prior to switching the unit on all of the leds are green, including the RDY led on the CU320-2, and when I look in "diagnostics->missing enables" I see:
Bit
0 OFF1 enable missing
9 Infeed enable missing
30 Speed controller inhibited

After the unit cuts off, the RDY led on the CU320-2 blinks red, and when I look in "diagnostics->missing enables" I see:
Bit
0 OFF1 enable missing
1 OFF2 enable missing
2 OFF3 enable missing
3 Operation enable missing
9 Infeed enable missing
10 Ramp-function generator enable missing
11 Ramp-function generator start missing
12 Setpoint enable missing
30 Speed controller inhibited

When I look at "diagnostics->status word sequence control" I see:
Bit
6 Switching on inhibited active
13 Command close holding brake

It seems to me there's something missing in the configuration logic, something needs to be hooked up in BICO, but I can't figure out what.

Thanks for your help.

 Hello ,

For let say the same problem for me ,

It was an under sizing of the 24 VDC

Regards

Bit Banger

The problem was that the default setting for the input voltage on the infeed was 400V rms, our input is 480V rms. When we changed it, it worked.

Thanks again for your input.

 dear sir 

cold you show me , how can i get these date " the input voltage in the infeed "

does it by using the scout or by what ? 

Hi Ahmed,

the user BitBanger isn't a part of the community anymore, so you won't receive any answer. Please start your own topic with your question to get some help. What's your issue exactly, which hardware and software are you using? 

BR,

Noodles