Fan Control - Latching Circuit

5min

Cooling and air distribution are essential to ensure a safe and optimal environment for workers. This example illustrates how to implement a latching circuit to monitor and control an industrial fan using the SCALAE AUTO﻿ styled PLC.
Industrial Fan
﻿
Operational Purpose
This example enables the following two objectives:
Toggle the running state of the ceiling fan by pressing START and STOP.
Testing the ceiling fan if it is running normally by pressing TEST.
Hardware
Device
Role
X0
Press START, XSTART=ON
X1
Press STOP, X1 = OFF, FAN = OFF
X2
Press TEST, XTest = ON, FAN = ON
X3
Error signal, = ON, FAN = OFF
Y1
Ceiling-fan motor control signal
﻿
Software
The following example is easily created using LDMicro.
﻿
I/O 
Role
RB0
Start
RB1
Stop
RB2
Err
RB3
Test
RD0
Fan
Program Description
Press Start, and XStart = On, and the fan will receive the start signal, and in the process, the latch on of YFan will active latch the signal on. While there is no error, the fan will continue to run.
When Stop is pressed, the circuit for Xon is broken and then the output signal for the fan is interrupted
If there is an error, the error input is triggered and this interrupts the Fan running signal and the fan will stop
When the Test button is pressed
The fan will receive the running signal, but the signal will not latch and once the button is released, then the fun will stop
The fan will run only if there is no error
All code samples available on GitHub : https://github.com/HavenTech/LDMICRO-Examples---PIC16F887﻿
﻿

Device	Role
X0	Press START, XSTART=ON
X1	Press STOP, X1 = OFF, FAN = OFF
X2	Press TEST, XTest = ON, FAN = ON
X3	Error signal, = ON, FAN = OFF
Y1	Ceiling-fan motor control signal

I/O	Role
RB0	Start
RB1	Stop
RB2	Err
RB3	Test
RD0	Fan

Updated 12 Dec 2024

Did this page help you?

Lighting Example

Advanced Applied Automation