This is PLC Program for ensuring sequential operation of Lubrication and gear Box Motor
Problem
Description
In industrial settings, gear box systems often require lubrication
before the main gear box motor mechanism can start. Proper lubrication ensures
smooth operation and extends the life of the gear box. However, operators may
sometimes start the gear box motor without initiating the lubrication process,
leading to potential damage and reduced efficiency. This PLC program aims to
implement a conditional logic circuit that ensures the lubrication system is
activated before the gear box motor can start.
Problem Diagram:-
Solution Overview
To address this problem, we will implement a simple conditional logic example. In this setup, there is one gear box motor that requires lubrication before it can start.
Lubrication System:
We have a lubrication motor that supplies lubrication oil to the main motor or gear box motor.
An interlock system will be put in place to prevent the operator from directly operating the main motor.
Sequential Operation:
The operator must first switch on the oil pump (lubrication motor) before being able to operate the main motor. This system ensures the gear box motor is well-maintained and can operate for a longer time.
Operator Controls:
The operator can start/stop the oil pump using dedicated start and stop push buttons for the oil pump. The main motor can also be controlled by its own start and stop push buttons.
Separate Push Buttons:
We will provide separate push buttons for each motor to ensure clear and independent control.
This approach ensures the gear box motor is always lubricated before operation, thereby protecting the motor and extending its lifespan.
Program
Here is the PLC program for the
conditional control circuit, along with a detailed program explanation.
List of Inputs/Outputs
Inputs List:
- Oil Pump Start Push Button: I0.0
- Oil Pump Stop Push Button: I0.1
- Main Motor Start Push Button: I0.2
- Main Motor Stop Push Button: I0.3
Outputs List:
- Oil Pump Motor:
Q0.0
- Main Motor:
Q0.1
Ladder diagram for Ensuring Sequential Operation of Lubrication and Gear Box Motor.
Detailed Program Explanation
Network 1
Starting the Oil Pump:Use a Normally Open (NO) contact for the oil pump start push button
(I0.0). Include a NO contact of the oil pump (Q0.0) coil for latching the coil.
Stopping the Oil Pump: Use a Normally Closed (NC) contact of the oil pump stop push button
(I0.1) in series to unlatch the circuit. Pressing the oil pump stop push button
(I0.1) will stop the oil pump (Q0.0).
Network 2
Starting the Main Motor: Use a NO contact for the main motor start push button (I0.2). Include
a NO contact of the main motor coil for latching the main motor (Q0.1).
Stopping the Main Motor: Use a NC contact of the main motor stop push button (I0.3) in series to
unlatch the circuit. Pressing the main motor stop push button (I0.3)
will stop the main motor (Q0.1).
Interlocking: Place a NO
contact of the oil pump (Q0.0) in series with the main motor start push button
(I0.2). This ensures that the operator must start the oil pump (Q0.0) before
they can start the main motor (Q0.1).
By following this logic, the oil pump must be
activated before the main motor can start. This ensures the gearbox motor is
properly lubricated before operation, reducing the risk of damage and
prolonging the life of the motor. Operators control the system using dedicated
start and stop push buttons for both the oil pump and the main motor, with an
interlock to enforce the correct operational sequence.