Learning Advanced Features
Longer pipes cause the actual pressure to decrease, which in turn increases the difference
between the pressure reference and the actual pressure. When the pipe lengths are equal
in two different systems, more pressure loss is caused in the system with greater flow. This
explains the pressure difference between (A) and (B) in the figure (when the flows are
different). To compensate for the pressure loss above, the value of AP1-31 is set to the
maximum volume of compensation when the inverter has the maximum frequency, and
adds to the PID reference after calculating compensation volume based on the output
frequency.
The final PID reference=PID-11+Compensation amount, and compensation amount is
shown below.
PID-53: PID Output Maximum value
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