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Does ATV28 range of variable speed drives has +/- speed function ?

The ATV28 is very old drive and the option of increase and decrease the speed through push button is not available in ATV28. 
You can use Analog Input (AI1) or preset speed command in ATV28 for changing the motor speed. it may require to change the drive to latest drive series (can use ATV630) drive, if the increase / decrease speed is mandatory for customer's application requirement. 
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