110
Chapter 6 ,P9 Failure and protection
P9-69
Speed deviation
excessive detection value
0.0
%~
50.0
%(
Maximum
frequency
)
Default
:
20.0%
P9-70
Speed deviation too large
detection time
0.0s
~
60.0s
Default
:
0.0s
This function is only available when the drive is running with speed sensor vector control.
When the inverter detects that the actual speed of the motor deviates from the set
frequency, the deviation amount is greater than the speed deviation excessive detection
value P9-69, and the duration is greater than the speed deviation excessive detection
time P9-70, the inverter fault alarm Err42, And according to the fault protection action
mode.
When the speed deviation is too large and the detection time is 0.0s, the speed deviation
excessive fault detection is canceled.
P9-71
Instantaneous stop non-
stop gain Kp
0~100
Default
:
40
P9-72
Instantaneous stop non-
stop integral coefficient Ki 0~100
Default
:
30
P9-73
Instantaneous stop and
stop motion deceleration
time
0~300.0s
Default
:
20.0s
(
1
)
When the bus voltage is constant, when the grid resumes power supply, the
inverter output frequency continues to run to the target frequency. When the grid is
restored, the inverter will continue to decelerate to 0Hz and stop until the inverter issues
the start command again.
(2) The purpose of instantaneous stop is to ensure that when the power supply of the
power grid is abnormal, the motor can be decelerated and stopped normally, so that the
motor can be started immediately after the grid is restored to normal power supply, and
will not suddenly owe because the motor is not properly powered by the grid. In the high
inertia system, the motor can stop for a long time. When the power supply is normal, the
motor can easily cause the inverter to overload or over-current faults because the motor is
rotating at high speed.
PA group process control PID function
PID control is a common method of process control. By proportional, integral and differential
calculation of the difference between the controlled feedback signal and the target signal, the
output frequency of the inverter is adjusted to form a closed-loop system, so that the controlled
quantity is stable. Target value.
It is suitable for process control situations such as flow control, pressure control and
temperature control. Figure 6-25 shows the control principle block diagram of process PID