Author Topic: 0-5v 0-10v conversion  (Read 9739 times)

sparks32

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0-5v 0-10v conversion
« on: January 25, 2015, 03:56:19 PM »
Hi Guys have i have a VSD that i want to connect to a fx2424. it has a 0-10v input to control the output frequency. i put a link to the Manuel. on page 22 of 89 is the description I have to work off. is there anyway to make the fx2424's 0-5V outputs compatible ?I'm new to analogue outputs.

http://industrial.omron.com.br/uploads/arquivos/Manual_3G3EV.pdf
thanks for help

garysdickinson

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Re:0-5v 0-10v conversion
« Reply #1 on: January 25, 2015, 07:18:34 PM »
Sorry, there is no diect way to get a 0..10 V analog output from the Fx2424.

The Fx1616-BA does support 0..10 V  analog outputs and would connected to your VSD without external circuitry.

With external circuitry it is possible get a 0..10 V signal from the Fx2424:

1. Use an operation amplifier with a gain of +2 to multiply the 0..5 V signal to 0..10 V
2. Use the PWM (pulse width modulated) outputs with some external circuitry to create a 0..10 V signal.

As you indicated that you have little experience with analog stuff, you will need help from someone with more expertise.

Good luck,

Gary d

sparks32

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Re:0-5v 0-10v conversion
« Reply #2 on: January 26, 2015, 01:11:06 AM »
thanks for your input. i thought about PWM but even filtered wouldn't the ripple be a concern? I'm trying to read up on the times 2 multiplier electronics and also maybe the data acquisition and control
modules none i which i know much about but i'm not sure which way i should be going for atm. all a bit of a learning curve really

garysdickinson

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Re:0-5v 0-10v conversion
« Reply #3 on: January 26, 2015, 03:56:33 AM »
On the PWM approach, managing ripple is handled by the external circuitry. This but one of many issues with analog circuitry.

You should look on page 4-22 of your inverter manual.  You will find an example of how the inverter can be programmed to get the full range of motor speeds with only a 0..5 V signal.

I think that 4-22 will elimate the need for external circuitry and allow direct connect between the PLC a and the inverter.

Best regards,

Gary d
« Last Edit: January 26, 2015, 03:59:08 AM by garysdickinson »

sparks32

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Re:0-5v 0-10v conversion
« Reply #4 on: January 26, 2015, 07:51:12 AM »
Thanks for the advice there. i see now i'll just set F max = 5v on the VSD, at the risk of looking stupid, i'll ask anyway could I make a connection from the fx2424 DB15 pin 14 to VSD FR and pin 9 (0V ) to FC leaving FS unconnected? would that give me a good connection to DAC #1? the FS 12V looks a bit scary. The VSD is already set to Voltage type input.

garysdickinson

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Re:0-5v 0-10v conversion
« Reply #5 on: January 26, 2015, 10:55:03 PM »
I think that you have got it right.

Inverter terminal, FC,is a 12V output. No connection to PLC

Inverter terminal, FR, is the 0..10V input. Connect to D/A #1 output on pin 14 on the DB15 connector.

Inverter terminal, FC, is the analog ground input.  Connect to the Analog ground on pin 9 of the DB15 connecter.

You should use a shielded cable with a pair of wires that are twisted together.  Think cable used for microphones. The cable shield must be connected ONLY to the ground terminal on the inverter.

The precautions on the cabling between the PLC and the inverter is because the VSD and electric motor can create an amazing amount of EMI and RFI that can raze havoc with analog signals.  

A VSD drive/inverter combination can be the basis of a very powerful, and unexpected radio transmitter.  Follow all of the inverter mfg's specs on wiring, shielding, grounding  and the use of RFI filtering to avoid knocking planes out of the air.

 Gary D.

sparks32

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Re:0-5v 0-10v conversion
« Reply #6 on: January 27, 2015, 01:26:36 AM »
thanks for your help once again Gary