User Manual
136
User Manual
137
Overspeed
detection value
0.0％〜50.0％
(Maximum frequency)
Default:20.0%
Overspeed
detection time
0.0s〜60.0s
Default：1.0s
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 exceeds the
set frequency, the excess value is greater than the overspeed detection value
P9-67, and the duration is longer than the overspeed detection time P9-68,
the inverter fault alarm Err43, and according to the fault protection action
mode deal with.
P9-67
P9-68
Speed deviation
excessive
detection value
0.0％〜50.0％
(Maximum frequency)
Default：20.0%
Speed deviation
too large
detection time
0.0s〜60.0s
Default：0.0s
P9-69
P9-70
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.
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 6-28 shows the control principle
block diagram of process PID
PA: Process control PID Function
PA-00
PID given source
Default : 0
PA-01
PID value given
0.0%～100.0%
Default : 5.0%
Target amount
+
-
Feedback
PID Output control
1 1
Ti
Td*s+1
P
1
1
0: PA-01 setting
1: Ai1 2 : Ai2
3: AI3 (panel potentiometer)
4: Pulse setting
5: Communication give
6: Multi-speed given
If the load-shedding protection function is valid, when the inverter output
current is less than the load-detection detection level P9-64 and the duration
is greater than the load-off detection time P9-65, the inverter output frequency
is automatically reduced to 7% of the rated frequency. During load-shed
protection, if the load recovers, the drive automatically returns to operating at
the set frequency.
Figure 6-28 Process PID block diagram
Chapter 6 Chapter 6
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