WEG CFW501 V1.8X Programming Manual page 177

Process Variable
P1011 - Main PID Controller
Automatic Setpoint
MOTOR SPEED
P0134 - Maximum Speed (rpm)
P1036 - Speed to Activate the
Sleep Mode
P0133 - Minimum Speed (rpm)
The analysis of the identified moments follows below:
1. The Main PID controller is controlling the motor speed and begins to reduce its. The motor speed is below
the value to activate the sleep mode (P1036) and the timing for the activation of the sleep mode (P1037)
begins.
2. The motor stays with the speed lower than the programmed (P1036) and the sleep mode activation time
(P1037) elapses. The sleep mode is then activated.
3. The command to stop the motor is executed; the system remains enabled and keeps monitoring the process
variable.
4. The difference between the process variable and the automatic setpoint of the main PID controller is greater
than the value set to activate the wake up mode (P1038) and the time count to activate the wake up mode
(P1039) begins;
5. The difference between the process variable and the automatic setpoint of the main PID controller remains
greater than the programmed value (P1038) and the time to activate the wake up mode (P1039) elapses;
Then, the wake up mode is activated.
6. The command to run the motor is given, and the system controls the process variable again according to
the control logic.
P1038 - Main PID controller wake up
percentage deviation
Figure 18.1: Operation diagram of the sleep and wake up
P1039 - Time to activate
P1037 - Time to activate
the sleep mode
1
2
3 4
HVAC Functions
the wake up mode
6
5
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