Impulse MAQ20-940 User Manual - Manual (Page 58)

ReDAQ
®
Shape Software for MAQ
®
20 User Manual
58
6.0 Quick Start Examples
6.1 Closed Loop Control
This closed loop control example demonstrates the implementation of
a “bang-bang” temperature
controller. It sets the temperature of a material to 75
o
C with a dead band of 2
o
C. The controller uses a
discrete output channel to turn on a heater when the process first starts. When the temperature of the
material reaches 75
o
C, the heater will turn off. Once the temperature cools down to 73C
o
, the heater will
turn on again. As long as the process is running, temperature “bang-bang” control will keep the
temperature of the material between 73 and 75 o C.
Step 1: Install a J-Type Thermocouple Input Module [MAQ20-JTC] configured with -100
o
C to +199
o
C
input range in analog input channel 0, 1_JTC_1_0, to monitor the temperature. Install a Discrete I/O
Module [MAQ20-DIOL] module for output.
The ReDAQ Shape Software for MAQ
®
20 will automatically set up the scale and units for the JTC module
on the Scale Data tab.
Step 2: On the Analyze Panel, Analog Input [AI] tab, set the Control Loop / Alarm Output to Tracking H
(tracking mode and high alarm).
The software will jump to Control Loop / Alarm Output tab to allow the output limit parameters to be set.
Step 3: In the Control Loop / Alarm Output tab, set the following parameters:
Config:
Active L (Tool output active low)
Output to Channel 1_DIO_Out_4_0 (Discrete output channel 0 controls the heater)
High Limit
75 (75
o
C high limit)
High Deadband 2 (2 o C deadband)