wiring analog control and feedback to a powerflex 525

Hi everyone,

I have a Powerflex 525 VFD that I am wanting to send a analog speed command to and get an analog speed indication back from. I am using a 6ES7134-6GF00-0AA1 for the AI card and a 6ES7135-6HD00-0BA1 for my AO card. They are wired to the VFD in the format shown in the attached image (the +24VDC on the AI card is the UV terminal).

The issue I am having is I keep getting a raw value of -22 on the analog input that doesn't change even though I confirmed the VFD speed is changing and outputting a value if the wire is off.  My analog cards are configured for 4-20mA signals (2-wire transducer for AI cards). I confirmed with Rockwell the wiring is correct on the VFD side of things. 

Anyone have any suggestions on how to get this to work?

For your module, the manual (for me, at Analog input module AI 8xI 2-/4-wire BA (6ES7134-6GF00-0AA1) (siemens.com) ) states for I2+ (terminal 3), the 2nd (Analog common) wire should be connected to I2- (terminal 11).

Perhaps you could use the analog common for both analog input and output by running a wire from the Analog common on the PF525 to a couple of jumpered terminals to make it easier to wire - and to troubleshoot.

AutoGen_9708956

Hi everyone,

I have a Powerflex 525 VFD that I am wanting to send a analog speed command to and get an analog speed indication back from. I am using a 6ES7134-6GF00-0AA1 for the AI card and a 6ES7135-6HD00-0BA1 for my AO card. They are wired to the VFD in the format shown in the attached image (the +24VDC on the AI card is the UV terminal).

The issue I am having is I keep getting a raw value of -22 on the analog input that doesn't change even though I confirmed the VFD speed is changing and outputting a value if the wire is off.  My analog cards are configured for 4-20mA signals (2-wire transducer for AI cards). I confirmed with Rockwell the wiring is correct on the VFD side of things. 

Anyone have any suggestions on how to get this to work?

 I debated that but the terminal 11 on the AI card is a Uv terminal and actually has 24VDC on it from the cards internal bus so we can't put it on the common of the VFD, since that needs to be ground. 

0_Einstein

For your module, the manual (for me, at Analog input module AI 8xI 2-/4-wire BA (6ES7134-6GF00-0AA1) (siemens.com) ) states for I2+ (terminal 3), the 2nd (Analog common) wire should be connected to I2- (terminal 11).

Perhaps you could use the analog common for both analog input and output by running a wire from the Analog common on the PF525 to a couple of jumpered terminals to make it easier to wire - and to troubleshoot.

AutoGen_9708956

Hi everyone,

I have a Powerflex 525 VFD that I am wanting to send a analog speed command to and get an analog speed indication back from. I am using a 6ES7134-6GF00-0AA1 for the AI card and a 6ES7135-6HD00-0BA1 for my AO card. They are wired to the VFD in the format shown in the attached image (the +24VDC on the AI card is the UV terminal).

The issue I am having is I keep getting a raw value of -22 on the analog input that doesn't change even though I confirmed the VFD speed is changing and outputting a value if the wire is off.  My analog cards are configured for 4-20mA signals (2-wire transducer for AI cards). I confirmed with Rockwell the wiring is correct on the VFD side of things. 

Anyone have any suggestions on how to get this to work?