Goodrive300-01A series VFD for air compressor Function code description
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A B C D E F C G H A
Time
Current pressure
P18.05
P18.07
P18.06
0
A B C D E F C G H A
Time
Current running frequency
P00.04
P18.12
0
P18.11
P01.15
In above figure, P18.05 is unloading pressure; P18.06 is loading pressure; P18.07 is the set pressure.
P00.04 is upper limit frequency, P18.11 is lower limit value of load-carrying running frequency, P18.12
is no-load frequency, P01.15 is stop speed. Description of A-H stage control process is shown below:
A: Standby state
B: Starting stage of startup, duration is P18.15 (including part of the acceleration time P00.11);
C: Constant discharge stage of loading, pressure PID regulation is valid;
D: Unloading stage, duration includes part of deceleration time P00.12 and P18.13;
E: Sleep stage, the VFD does not run;
F: Starting stage of wake-up, duration is P18.15 (including part of the acceleration time P00.11);
G: Starting stage of stop, duration includes part of deceleration time P00.12 and P18.14;
H: Restart delay stage after stop, duration is P18.16.
When air compressor control is valid and under automatic loading/unloading mode, the air
compressor enters normal air supply state after starts. When the discharge pressure is higher than
P18.05, automatic unloading will be applied, and the VFD enters sleep state. If sleep function is
invalid, the VFD will continue running at no-load frequency P18.12. When the discharge pressure is
lower than P18.06, automatic loading will be applied, and during load-carrying running, the master
speed is controlled by pressure PID. P18.07 is used to set the air supply pressure when the air
compressor runs stably. The VFD keeps the discharge pressure constant by regulating the master
speed. Constant-pressure control adopts PID algorithm, and the frequency reference source of the
master is set by P00.06=7, the PID reference source selects P09.00 = 10, reference pressure is set
via P18.07. The feedback source of PID P09.02 = 8, which is obtained by detecting the pressure
signal. PID parameter P9.04, P9.05 and P9.06 adopts system default values.
Note: In above figure, the VFD stops as per P01.08, default setting is decelerate to stop.
Normal stop command and unloading stage are deceleration process; the VFD will change to coast to
stop during emergency-stop operation and faults.
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