Altivar 61 Modbus + Carel PCOXs Serial Card

Frost

Member
Join Date
Sep 2008
Location
Toronto
Posts
1
Hi there,

I am trying to run a Carel PCOXs based system using a RS485 serial card to talk modbus (9600 @ 8N1) to an Altivar 61 VFD. The VFD is programmed to "listen" at the right baud and parity but I get nothing but CRC errors on the VFD. When I hook it up to my laptop using Modbus Tester, every message polled gets a valid response. I've checked the wiring and it's fine (in fact when I hook up my laptop, I hook it up through the terminals on the PLC with the PLC off).

It's not the drive since I can start it on the laptop.

Any ideas? I tried to simulate the CRC errors and the only time I can duplicate it is if I connect the + and - together. Then I get the same pattern of CRC errors. Could the program be doing this???

Thanks.

K
 

Similar Topics

All, We have a site that has multiple Altivar 66's that are being controlled by an old Square D Modbus+ network. One of the VFD's has failed...
Replies
2
Views
354
Hello, I was having problems finding the correct registers to read some of the registers on a Altivar 630 VFD. I would like to read the following...
Replies
20
Views
9,086
Hello everyone. I'm trying to communicate a Controllogix L36ERM with a 1769-SM2 Modbus module to a Schneider-electric Altivar 312 Modbus motor...
Replies
7
Views
2,451
Hi all, i have a S7-1200 with a CM1241 and i want to control 10 Altivar312 Inverters. Does anyone have a good working sample?
Replies
2
Views
2,495
Hi all, I am trying to control and/or read values from Schneider Altivar12 VFDs. Via Modbus on a AB Micro850 PLC (using the Connected Components...
Replies
1
Views
3,912
Back
Top Bottom