Encoder position with vfd

[ABlearner]

Hello guys. 

I have a question, i have a mistubishi fr-a800 vfd with an encoder option card. On the motor we have an encoder. 

I can read back the speed with the plc with analog signal. But can i use also for, tracking the distance ? Can i set anyhow the inverter lets say after one round on the encder send some digital signal to the plc. Is there any chance to set it ? 

Lets say this is a conveyor, in this case its better if i put an encoder/counter on the conveyor and it will be directly connected to the plc. 

Thanks ahead

[glavanov]

The model option card inastalled for the encoder is?

Encoder outputs differential or open collector?

Edited April 26, 2023 by glavanov

[ABlearner]

Thanks for the feedback. 

The encoder is sew ES7C/AA.

TTL/HTL encoder.

So actually none of them. Its a push pull output encoder.

The option card type is FR A8AP. 

 

So if i can get position then how ? I already use the inverter to read the speed of the motor. Thanks ahead. 

[glavanov]

With this option card you can't use the encoder with another device/PLC.

If the butget allows you can switch to FR-A8AL.

This card have outputs, that cab be connected to other devices and use A, B and Z pulses from the encoder.

In this case is important what  is the PLC inputs mode (sinc or source).

section 8 from here: https://dl.mitsubishielectric.com/dl/fa/document/manual/inv/ib0600597eng/ib0600597engc.pdf

Other options are to use the A800 PLC function to monitor and compare motor current position and use one or more invetrer digital ouputs for signal to the PLC: https://www.allied-automation.com/wp-content/uploads/2015/02/MITSUBISHI_FR-A800-PLC-FUNCTION-PROGRAMMING-MANUAL.pdf

or monitor it over CC-link IE Field BAsic network if it's available with your inverter and PLC...