WEG CFW300 V1.3X, Руководство по программированию

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SoftPLC
CFW300 | 18-15
18
P929 – PID Controller Operation Mode
Adjustable
Range:
0 = Manual
1 = Automatic
2 = Control Selection to Manual (0) or Automatic (1) via digital input
DI2
Factory
Setting:
2
Properties: cfg
Description:
This parameter defines the operation mode of the CFW300 PID controller.
Table 18.10: Description of the PID controller operation mode
P928 Description
0
It defines that the PID controller will always operate in manual mode. In other words, the process variable will not be controlled
according to the control setpoint required by the user, and the PID controller output value will be the setpoint value in manual
mode programmed in parameter P918
1
It defines that the PID controller will operate in automatic mode, that is, the process variable will be controlled according to the
control setpoint required by the user and the PID controller output value will behave according to the settings defined by the user
2
It defines the PID controller will be able to operate in manual or automatic mode according to the state of digital input DI2. In other
words, if the digital input is in logical level “0”, the PID controller will operate in manual mode; if the digital input is in logical level
“1”, the PID controller will operate in automatic mode
NOTE!
The change from an operation mode to another with the motor running may cause disturbances
on the system control. That can be optimized according to the automatic adjustment mode of the
PID controller setpoint defined in parameter P930 together with the bumpless transfer characteristic
from the manual mode to the automatic mode of the PID block of the SoftPLC function.
Bumpless transfer is merely making the transfer from the manual mode to the automatic mode
without causing variation in the PID controller output. In other words, when the transition from the
manual mode to the automatic mode occurs, the PID controller output value in manual mode is
used to start the integral part of the PID controller in automatic mode. That ensures that the output
will start from this value.
P930 – Automatic Adjustment of the PID Controller Setpoint
Adjustable
Range:
0 = P911 inactive and P918 inactive
1 = P911 active and P918 inactive
2 = P911 inactive and P918 active
3 = P911 active and P918 active Factory
Setting:
0
Properties:
Description:
This parameter defines if the PID controller setpoint in automatic mode (P911) and/or in manual mode (P918)
will be automatically changed or adjusted when the PID controller operation mode changes.
NOTE!
The adjustment of the control setpoint in automatic mode is only valid when the control setpoint
source is HMI or communication networks (P920 = 0) or via the Electronic Potentiometer Function
(P920 = 3). For other control setpoint sources, the automatic adjustment is not executed.