OkiePC
Lifetime Supporting Member
Anyone have some info for how to control a TECO EQ7 series VFD via Modbus RTU?
We originally installed a pair of Yaskawa GA800s at the remote site and one of them failed. A competitor was $200 cheaper and installed a TECO EQ7, so now they're paying us $200 an hour to make it work with the existing Modbus RTU PLC in control.
I think I gleaned from some of the worst manuals ever written where to write the speed command and control word in this drive (not yet tested) and now I would like to know how to monitor some basic operational data like output frequency and amps.
Both my read and write MSGs are completing successfully in a Micrologix 1100, but the data I am reading may not be useful and as yet is unlabeled in my PLC code.
I am writing to Holding Register 41798 the speed reference as Hz x 10 and the command word to 41799
I am reading 14 words starting with Holding Register 42055 after parsing an example from a Fuji Manual using this handy tool https://rapidscada.net/modbus/
We were first told this was a TECO Frenic MEGA series, but my partner who's on site sent a pic that makes no mention of FUJI, and my quest for useful manuals only made me curse the writers of the few I found.
We originally installed a pair of Yaskawa GA800s at the remote site and one of them failed. A competitor was $200 cheaper and installed a TECO EQ7, so now they're paying us $200 an hour to make it work with the existing Modbus RTU PLC in control.
I think I gleaned from some of the worst manuals ever written where to write the speed command and control word in this drive (not yet tested) and now I would like to know how to monitor some basic operational data like output frequency and amps.
Both my read and write MSGs are completing successfully in a Micrologix 1100, but the data I am reading may not be useful and as yet is unlabeled in my PLC code.
I am writing to Holding Register 41798 the speed reference as Hz x 10 and the command word to 41799
I am reading 14 words starting with Holding Register 42055 after parsing an example from a Fuji Manual using this handy tool https://rapidscada.net/modbus/
We were first told this was a TECO Frenic MEGA series, but my partner who's on site sent a pic that makes no mention of FUJI, and my quest for useful manuals only made me curse the writers of the few I found.