Alpha 6000 User Manual page 132

 P7.01 is used to define the input method of PID feedback. If P7.01 is set to 9, speed
PID is selected as PID feedback. If the feed is analog input, the analog signal should
be set according to full-scale of the maximum speed (The max of signal should be
corresponding to the maximum frequency speed). The other setting of P7.01 means
analog PID feedback selection.
 AI1/AI2, serial communication: The same description as PID feed selection
(P7.00).
 PG or Single-phase speed measuring input: Uses pulse encoder (PG) as the speed
PID control. At this time, terminal X7 or X8 must be set to speed measuring.
 |AI1-AI2|: Sub the PID feed analog input signal and the PID feedback input signal,
the absolute value is treated as the final feedback value. This function can be used
control temperature difference, pressure difference and so on.
to
P7.02 Analog PID digital feed
Note:

When analog feedback is used (P7.01=0~8), this function can realize digital setting
of reference by keyboard. The setting must match the range of the actual physical
value.
P7.03 Speed PID feed
Note:

If PG pulse feedback is used (P7.01=9), the speed reference can be set by keyboard.
If the range of speed PID input over 10000, the keyboard will display as "1000.".
P7.04 PID direction alteration permission
0: Not allowed
Note:
 P7.04 is only suitable for analog PID(P7.01!=9)；Speed PID(P7.01=9) only
outputs positive frequency(P7.01=9);
 When the setting is 0, switching is not allowed. If the PID output frequency is
calculated by the given frequency and the feedback frequency, the final setting
frequency is negative after the process of frequency setting selection P0.03, do not
switch the running direction. Moreover, if the final frequency is 0, the inverter's
output frequency is 0. When the frequency is not set by combination, the PID
output frequency cannot be negative; when it is set by combination, the frequency
is decided by the combination type and frequency 2.
 When the setting is 1, switching is allowed. If the PID output frequency is
calculated by the given frequency and the feedback frequency, the final setting
frequency is positive after the process of frequency setting selection P0.03, keep
Chapter 5 Parameter Introductions
Range: 0.0~P7.14【0.0】
Range: 0~24000rpm【0 rpm】
Setting range: 0,1【0】
1: Allowed
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