Operating Instructions

Descriptions of Parameter Settings
Descriptions of Parameter Settings
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In some cases, it is only possible for the PID to control the set point and the feedback to the same status when the
PID output frequency is negative (the motor runs in reverse). However, an excessively high reverse frequency is
not allowed in some cases, and Pr.08-67 is used to determine the upper limit of the reverse frequency
Pr.
Explanation
Settings
Default
08-68
PID deviation limit
0.00 to 100.00%
0.00
When Pr.08-68 is not set to 0, the PID deviation limit function is enabled.
When PID deviation ≤ PID deviation limit, PID stops adjusting, which means the PID output frequency maintains
the value at last status. This function is effective for some closed-loop control applications.
Pr.
Explanation
Settings
Default
08-69
Integral separation level
0.00 to 100.00%
0.00
Reduces overshoot when overshoot occurs in the PID feedback at start-up.
When Pr.08-69 is not set to 0, the integral separation function is enabled.
The benchmark for the integral separation level is the PID error%.
The integral separation function activates only once at start-up.
When PID deviation ≥ Pr.08-69, the integral effect is cancelled to avoid the increasing system overshoot due to the
integral effect. When PID deviation is smaller than Pr.08-69, the integral effect is activated to eliminate the steady-
state error.
Pr.
Explanation
Settings
Default
08-70
Smart start-up level
0.00 to 100.00%
5.00
08-71
Smart start-up frequency
command
0.00 to 599.00 Hz
0.00
08-72
Smart start-up acceleration time
0.00–600.00 sec.
3.00
When Pr.08-71 is not set to 0, the smart start-up function is enabled.
The benchmark for the smart start-up level is the percentage of PID deviation.
Use the smart start-up function to reduce overshoot when overshoot occurs in the PID feedback at start-up. The
smart start-up activates only once at start-up.
When the smart start-up function is enabled, it starts with the Pr.08-71 frequency and Pr.08-72 acceleration time
(Pr.08-72 acceleration time is the time that it accelerates to Pr.08-71). When the PID deviation is smaller than
Pr.08-70, it switches to the normal PID control (the smart start-up frequency is filled into the PID integral when
switching to PID control to avoid discontinuous frequency).