WEG CFW700 User Manual - page 34
CFW700 | 29
Keypad (HMI) and Basic Programming
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extension type) or a market standard Null-Modem cable. Maximum length of 50 m (164 ft). It
is recommended the use of the M3 x 5.8 standoffs supplied with the product. Recommended
torque: 0.5 N.m (4.5 lbf.in).
Use the keypad frame accessory to assembly the keypad on the panel door or control table
(see
section 7.2 ACCESSORIES on page 58
, or perform the drilling as shown in
NOTE!
A list of parameters is supplied with the product, for additional information on
each parameter refer to the CFW700 programming manual provided in the
CD-ROM that accompanies the product or it can be downloaded at the WEG
homepage - www.weg.net.
4.2 APPLICATIONS
The CFW700 has some features that allow better matching the inverter commands to the
application. These features were grouped into a set of applications and can be as simple as the
forward and reverse command, or more elaborated such as a PID controller.The applications
were implemented using the SoftPLC function, in other words, ladder programming applicative
built-in to the CFW700 inverter. It allows the user that has the WLP and the built-in implemented
applicative to change it and use it as an user applicative.
Parameter P1003 allows selecting an application and uploading it to the CFW700. The CFW700
has following applications built-in:
PID Regulator.
Electronic Potentiometer (E.P.).
Multispeed.
3-Wire Start/Stop.
Forward/Reverse Run.
4.2.1 PID Regulator Application
The CFW700 has the PID REGULATOR application that can be used to control a closed loop
process. This application sets proportional, integral and derivative regulator superimposed to
the regular speed control of the CFW700 inverter.
The CFW700 will compare the setpoint with the process variable and control the motor speed
trying to eliminate any error and keeping the process variable equal to the setpoint. The setting
of the P, I and D gains determines how fast the inverter will respond to eliminate this error.
Application examples:
Flow control or pressure in a pipe system.
Temperature of a furnace or oven.
Dosing of chemicals in tanks.