SoftPLC
CFW300 | 18-19
18
1
0
1
2
4
5
6
P936 - process variable deviation to wake up
P937 - time to wake up
COMANDS - DIGITAL INPUTS
MOTOR SPEED (Hz)
PROCESS VARIABLE
DI1 - run/stop
P134 - maximum speed reference
P938 - motor speed to activate the sleep mode
P133 - minimum speed reference
P911 - control setpoint
P939 - time to activate
the sleep mode
7
8 9
3
Figure 18.4:
Operation of the PID controller with the sleep mode enabled
1. The Run/Stop command via digital input DI1 enables the starting of the motor. As the wake up condition was
not detected, it remains in sleep mode, and the motor remains stopped.
2. The process variable starts to decrease and becomes smaller than the deviation of the process variable
programmed to wake up (P936); at this moment, the time count to wake up (P937) begins.
3. The process variable remains smaller than the process variable deviation to wake up (P936), and the time
to wake up (P937) elapses; at this moment, the command to start the motor and control the system with its
speed variation is executed.
4. The inverter accelerates the motor up to the minimum speed (P133). After that, the PID controller is enabled
and starts controlling the motor speed.
5. Then it is possible to control the process variable so that it reaches the control setpoint required by the user. To
that end, the PID controller output is incremented, making the motor speed increase until reaching the control
stabilization.
6. The value of the process variable remains above the required control setpoint due to a decrease in demand,
and the motor speed starts slowing down.
7. The value of the motor speed falls below the value to sleep (P938); the time count to activate the sleep mode
(P939) begins.
8. The motor speed remains below the value to sleep (P938), and the time to activate the sleep mode (P939)
elapses; at this moment, the command to switch off the motor is executed.
9. The motor is decelerated down to 0 Hz and remains stopped; at this moment the PID controller goes into the
sleep mode.
Summary of Contents for CFW300 V1.3X
Page 2: ......
Page 8: ...Contents...
Page 46: ...Identification of the Inverter Model and Accessories 6 4 CFW300 6...
Page 60: ...Logical Command and Speed Reference 7 14 CFW300 7...
Page 72: ...V f Scalar Control 9 10 CFW300 9...
Page 80: ...VVW Vector Control 10 8 CFW300 10...
Page 116: ...Digital and Analog Inputs and Outputs 12 24 CFW300 12...
Page 132: ...Reading Parameters 15 6 CFW300 15...
