Delta MMC120 Manual do Utilizador descarregar pdf (Página 71)

Insufficient pump and/or accumulator capacity will cause the system response to degrade

during a move because the effective pressure drops.

Pressure transients due to insufficient accumulator volume cause jerky motion,

particularly during starts and stops.

NOTE: Even systems with ‘fast’ pumps usually require at least a small accumulator

near the cylinder to maintain the constant pressure needed to get smooth

motion.

Insufficient pump capacity can result in inadequate control when moving many axes

simultaneously or when making long moves. In these cases pressure can drop so much a

fully open valve cannot maintain the requested speed.

Identification and Correction

To identify and correct these problems, make a move with very low (or zero) gains

except the FEED FORWARD terms. Graph the move. The graph (ignoring the Position

terms) should show:

If the actual speed and target speed show:

Your valve probably has overlap. Replace the valve with a linear one or try increasing

the DEAD BAND ELIMINATOR value.

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Delta MMC120 Manual do Utilizador Página 71