Goodrive270 series VFD for fan and pump Basic operation guidelines
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Table 5-5 Motor adding logic in fixed variable-frequency run mode
Table 5-6 Motor reducing logic in fixed variable-frequency run mode
5.5.17 PID function only for water supply
The VFD provides two groups of PID only for water supply, only by which HVAC related PID setting
can be implemented. The following takes PID1 as an example to describe the function.
The unit of PID1 reference and PID1 feedback can be specified by P90.00. PID source 1 (P90.06 and
P90.08, that is, PID reference and feedback) can be set for PID1, and PID source 2 (P90.11 and
P90.13, that is, PID reference and feedback) can be set for PID2. P90.16 is the combination method
of PID source1 and source 2.
PID1 reference and PID1 feedback can be set to the actual water pressure values but not a
percentage. P90.01 can specify the number of decimal places of PID1 reference and PID1 feedback.
P90.02 can specify the actual water pressure corresponding to 100% of PID1 reference. P90.03 and
P90.04 can specify the upper limit and lower limit of PID1 reference. In most cases, P90.02 and
P90.03 are set to the same value. P89.09 and P89.10 can be used to view the percentage of PID1
reference and PID1 feedback.
Note: PID2 differs from PID1 because PID2 cannot participate in the running frequency regulation.
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