Trainer Set Overview

The training system is designed to demonstrate the construction and functioning of various DC and AC machines, including single-phase and three-phase motors. The system is equipped with the following components:

• Friction brake arrangement

• Dynamometer

• Instrument panel

• Power supply unit

• PC interface with virtual workbench package

• USB/serial Modbus-based software

Power Supply Panel

• Input: 3-phase DOL Starter Panel

  • MCB: 4-pole, 415V/1A

  • Contactor: DOL 9A, with 230V/50Hz/11VA coil

  • Overload Relay: Bimetallic thermal, range 1.4A - 2.3A

Multifunction 3-Phase Meter (2 Nos.)

• Connection: 3-phase, 3/4 wire

• Voltage Input: 400V/230V AC

• Auxiliary Supply: 230V AC, 45-65Hz, 5W

• Display: LCD/LED

• CT Input: 5A, 0.1 VA/Phase

• Measurement Parameters: V, I, Hz, P.F, KVA, KW, KWh

• Termination: SBSS terminal

FWD/REV & Star-Delta Starter Panel

• Switches:

  • 3-pole, 3-way FWD/REV switch with center OFF (6A/440V)

  • 3-pole, 3-way Star/Delta switch with center OFF (6A/440V)

3-Phase Wound Rotor & Synchronous Motor Panel

• Rotor Resistors: 30Ω/5A with 3 taps (0Ω, 15Ω, 21Ω, 30Ω)

• Rotor Resistor Selector Switch: 3-pole, 6-way, 6A/440V

• DC Rotor Excitation Overcurrent Relay: 3A

Single-Phase Motor, Alternator & Synchronous Motor Panel

• MCBs: 2 Nos. (4A/1.6A)

• Selector Switches: 2 Nos. (2P2W) to switch between 1φ alternator and synchronous motor

• Pushbutton Switch: 8A to simulate centrifugal switch

DC Voltmeter and DC Ammeter Panel

• DC Voltmeter: 0-300V

• DC Ammeter: 0-5A with polarity protection diode

• Field Failure Relay: To control armature supply (6A/6B)

SCR Actuator (Variable DC) cum Sensor Signal Conditioning Panels (3 Nos.)

• Type: Half-bridge SCR-based (0V-195V / 5A) with cosine firing and linear characteristics

• Signal Conditioning: Supports circuits for speed and torque (kg wt) to output 0-2.5V DC (FS)

• Required for: DC armature, DC motor field, and AC generator field

Instrumentation Power Supply cum Multichannel Digital Meter Panel

• Power Supplies:

  • +/-12V, 500mA

  • +5V, 300mA

  • Unregulated 17V DC/750mA

  • Line synchronizing signal

  • 13V / 3A

• Digital Display: Multichannel display for parameters like torque, speed, etc.

Resistor Load Panel

• AC Resistors: 10K/200W (3 phases, 6 steps)

• DC Resistors: 750Ω/400W (6 steps)

• Off Position: For no-load operation

LC Load Panels (2 Nos.)

• Inductive Load: 0.15H, 0.3H, 0.45H, 0.6H, 0.75H, 1.5H, 3H, 400mA (3 Nos.)

• Capacitive Load: 1.25μF, 2.5μF, 5μF, 415V (3 Nos.)

Computer Interface Panel

• PC Interface: USB port using USB I/O module via 25-pin D (M) connector and Type A to Mini B cable

• ADC Channels: 4 channels (0 to 2.5V FS), with 1 input simulation potentiometer

• DAC Channel: 1 channel (O/P 2.5V FS)

• Function Block: V-to-I (0-2.5V input, 0-20 or 4-20mA output) and I-to-V (4-20mA input, 0-2.5V output)

• Switchable: I/V and V/I function blocks

Software Required

• Virtual Workbench Package: USB/Serial Modbus-based software compatible with Windows .NET platform

  • Features: Supports multiple control strategies like PID controllers (single/multi-loop), fuzzy controller, graph plotting (XY, XT, and polar modes), Modbus interface, data logging, event trigger, inbuilt function generator, etc.

Motor Specifications

1. DC Integrated Machine

• Voltage: Varm = 180V, Vfield = 180V

• Capacity: 300W, 2-pole machine, 1500RPM, 6 terminals

• Rotor Construction: Standard commutator/brush arrangement with laminated stack

• Stator Construction: Separately excited field winding with laminated pole solid yoke and series winding, brought out on 4 terminals

• Machine Mounting: Chassis mounted with 19mm diameter trunnion, used as dynamometer with torque and speed sensors

• Applications: Can work as shunt/series/compound motor as well as generator

2. Three-Phase AC Integrated Machine

• Voltage: 415VAC, 50Hz

• Capacity: 300W, 4-pole machine, 1500RPM, 10 terminals

• Rotor Construction: Star-connected, with 4 slip rings mounted on the shaft

• Stator Construction: Six terminals to start the machine using Star-Delta starter

• Machine Mounting: Chassis mounted with 19mm diameter trunnion

• Applications: Can work as slip ring wound rotor I.M., synchronous motor, and synchronous generator

3. Single-Phase AC Integrated Machine

• Voltage: 230VAC, 50Hz

• Capacity: 300W, 4-pole machine, 1500RPM, 10 terminals

• Rotor Construction: Die-cast rotor

• Stator Construction: Two windings for main and auxiliary, brought out on 4 terminals (for Split-phase, CSCR, CSIR configurations)

List of Experiments

1. DC Machines:

   • Speed-torque curves of wound rotor induction motor (with rotor shorted and different rotor resistors)

   • DOL/Star-Delta starters, rotor resistance starter

   • Application of synchronous motor as a power factor improvement device (V curve)

2. Generators:

   • Synchronous generator V-I curve

3. Efficiency of 3-Phase AC Machines

4. Single-Phase AC Machines:

   • Speed-torque curves of split-phase induction motor

   • Speed-torque curves of CSIR

   • Speed-torque curves of CSCR