Hi

We have problem with one of your device, when we start ALM module (and all what is in power circuit before) we have strange 200A 500micros peak on PE cable. The device was sent to us from customer, because their RCD is deployed.

So when we start cabinet everything is OK, until we start ALM power circut via contactors. Then we have a peak. I remember many years ago on exhibition we had similiar issue and messe electrician have to remove RCD

Is this siemens standart? or something is wrong?

p.s. we already exchanged everything

Is the ALM always enabled by control scheme, or do you send a telegram to enable the ALM after energizing the upstream contactor?

I have a smaller but similar sinamics setup.  The main circuit breaker feeding the ALM has to be on some number of seconds before the ALM gets sent the OFF1 (enable) signal via telegram.

I have not had problems with strange faults.  However, I did not use an RCD nor did I measure the RC on PE.  NO drive faults at startup which makes us all quite happy.

When that circuit breaker (RCCB) gets pulled in, it resulted in quite the jolt for the project mechanical engineer the first few times he heard it.  He jumped back the first couple times and the 3rd time he expected it but still winced a little.

I imagine the contactor on your system has to cause quite the disturbance when it pulls in.

You can combine multiple images into a single zip file and upload the zip file.

Kulda_CZ

Drawings

i have no idea how to put more pictures to one post :) :)

there is auxiliary contact on contactor for signal for ALM, when we get the signal on ALM we start ALM by program

Today i want to make measurement on different device, but with same power philosofy and then i will know - yes this is standart siemens :-)

thank you anyway