Induction Motor Fault Detection using Delta PLC DVP-14SS2
Induction Motor Fault Detection using Delta PLC DVP-14SS2
Grenze International Journal of Engineering & Technology (GIJET), 2024, Vol 10, p1421 · Oct 27, 2023
Research Gate Link : (PDF) PLC based Fault Detection and Protection of a Three Phase Induction Motor
Youtube Video Link : fault detection and protection of 3 phase induction motor
Abstract: Induction motors are widely used in industries as well as some home appliances. It is
therefore necessary to provide protection from likely sources of faults such as overcurrent,
overvoltage, under voltage and high temperature. The continuous and intensive use of squirrel
cage induction motors in modern industry has in some cases caused a serious deterioration of
the electrical insulation in the windings of the machine, generating internal short-circuit
failures. Early detection of the fault is essential due to technical and economic issues. The
classical method of protecting induction motors from faults involves the use of timers,
contactors, and voltage and current relays. Simulation of fault detection is observed using DVP
SS2 series PLC with the ISP Soft and DOP Soft software. The results are validated using the
hardware experimental setup including voltage, current relays with contactors and auxiliary
relays. The method is highly reliable in protection of motor for various conditions.
Summary:
This project aims to develop an automated system for monitoring and safeguarding the
operation of a 3-phase induction motor. Induction motors are widely used in industrial
applications, and their reliable performance is crucial for efficient operations. Therefore, the
detection and protection of faults in these motors play a vital role in ensuring their longevity
and preventing costly breakdowns.
The project proposes the utilization of a Programmable Logic Controller (PLC) as the central
control unit for monitoring and safeguarding the induction motor. The PLC serves as an
intelligent controller that continuously monitors various motor parameters, such as current,
voltage, and temperature. By incorporating programs using ladder logic into the PLC, the
equipment is able to detect any anomalies in the measured values and cuts off the supply
from the motor if the values exceed or fall below a certain limit.
The PLC used is a Delta DVP-14SS2 PLC. It has 8 digital inputs and 6 digital outputs. Delta uses
a proprietary software called ISPSoft which is used to design the program used in this project.
The detection methods used to identify the motor faults by using PLC are listed as follows:
1. Overvoltage and undervoltage detection – using an overvoltage/undervoltage
(OV/UV) relay
2. Overcurrent detection – using a thermal overload relay (OLR)
3. Temperature measurement – using a resistance temperature detector (RTD).
The circuit consists of a 3-phase supply connected to a 3-phase induction motor through a 3
phase AC contactor. The PLC has 5 inputs connected to a thermal overload relay, an
overvoltage/undervoltage relay, a temperature sensor, a start button, and a stop button. The
PLC has its 6 outputs connected to the AC contactor, the ON and OFF indicators, and the three
fault indicators that indicate a current, voltage or temperature fault.
The overvoltage and undervoltage is simulated using a dimmerstat, a device that varies the
input supply voltage.
As the overvoltage/undervoltage relay detects an increase or decrease
in voltage, it sends a signal to the PLC, which turns off the contactor and stops the motor. The
overload fault and temperature faults are obtained by increasing the load to the motor.
Apart from implementing the hardware for motor fault detection, this project also includes a
simulation of the same. This is done by simulating a Delta DVP-14SS2 PLC using the ISPSoft
software and creating a human-machine interface or HMI using the software DOPSoft. Using
a similar code, the circuit is simulated and identical results are obtained.
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