AB7702-B Electrical Details

Ben Longo

• November 01, 2023 14:30

The electrical information provided in the AB7702-B datasheet and manual is insufficient. The only information I see in the manual is:

Power supply: 9–24 V DC or AC, SELV

Power consumption: 2.0 W

But this conflicts with the technical data on the website which claims:

Current consumption: 70 mA@24 VDC (1.7 W)

Which one is correct?

Some questions:

1. Are the RS485 signals isolated?
2. What's the inrush current?
3. What's maximum current @24V and typical current @24V?

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  Kyle Reynolds

  • November 01, 2023 15:40
  • Edited

  Hi Ben, 

  I believe the 2.0W figure is a maximum and should be used for selecting a power supply. The 1.7W is the actual wattage when a 24 VDC power supply is used and the current is 70 mA, but I'm not sure if that amperage is a maximum or average. I will have to check with the product team.  

  I will also check with the product team regarding your other questions.

  Have you already purchased this device or are you researching Modbus RTU to TCP gateways? We also have an Intesis Modbus RTU to TCP router, order code INMBSRTR0320000.

  Best Regards, 

  Kyle

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  Ben Longo

  • November 01, 2023 15:20

  Hi Kyle,

  Thanks for your response. I have not purchased the device yet because I'm not sure it would work in the weird power conditions I have.

  I only have access to a 100mA 24V supply off an existing VFD. Adding an additional 24V supply would be quite difficult in this application so I'd love to just use that 100mA supply but I'm not certain it would work.

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  Kyle Reynolds

  • November 01, 2023 15:30

  Just to clarify, are you asking if the RS485 signal is isolated from the power supply? 

   

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  Ben Longo

  • November 01, 2023 15:30

  Yes.

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  Kyle Reynolds

  • November 01, 2023 15:40

  Yes, the RS485 signal is isolated. 

  Also, I believe that 100 mA will be sufficient as even if the 70 mA is an average, as it should not vary much during operation. As long as it receives a consistent current from the drive, it should work fine. 

  I will let you know when the Product Manager gets back to me with additional info. 

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  Ben Longo

  • November 01, 2023 15:40

  Thanks! And yes that makes sense. The only thing I'm concerned about is the initial inrush current being >100mA and tripping the supply.

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  Kyle Reynolds

  • November 01, 2023 15:45

  Gotcha - it shouldn't ever be much higher than 70 mA, even on start-up. Although I'm 99% sure of this, I will follow up with you when I can confirm it 100%. 

   

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