Power Supply Module.

Suitable for supplying fixed and variable alternating current and fixed and variable rectified direct current, in order to easily carry out all the tests on electrical machines of the UNILAB laboratory and in general in an electric measurement laboratory.

code

Description

Technical specifications

DL 10055

MECHANICAL POWER DIGITAL MEASURING UNIT

Didactic equipment:   Housed in metallic box with PVC label. For direct measurement of motor output torque through load cell and of rotating speed through optical transducer with mechanic power display; provided with direct current variable power supply for the excitation of the brakes or of the dynamometer. Digital readout of measured quantities and their conditioning  to voltage levels that must be directly compatible  for data acquisition of the electromechanical characteristics of the machines. Supplied with connector for overspeed protection of the motors through the connection to power supply module.
Technical features:  Tachometer section
The section must be composed of a 4-digit digital meter, allowing to measure the speed of the machine under test when this is provided of a transducer and of a variable threshold circuit which switches the supply off when the dangerous speed limit is exceeded.-
Measuring range: 0 to 6000 rpm
- Meter accuracy: ±1 digit ±0.5%  (±10 rpm)
- Auxiliary contact: 1A, 220V, 30W
Torque meter section
The digital meter for measuring the torque, coupled to the load cell mounted on the brakes or braking dc generators, must allow the direct reading of the torque in Nm.
- Measuring range:  150N (15 kg) cell: the reading is 0 to 9.99 Nm Accuracy: 0.5%
Wattmeter section
The wattmeter section must be composed of a 4-digits digital meter and must show the axis power of the machine under test
Power supply section
The module must be  provided with a variable dc power supply unit to be used for the excitation of either machines or brakes.
Output voltage: dc, 0 to 220 V
Maximum current: 2 A
Protection: magnetothermic

Item

Spec's

Q.ty

DL 10065N

ELECTRICAL POWER MEASURING MODULE - didactic equipment:

Housed in an aluminium box with PVC label and provided with a panel with safety terminals showing schematic diagram.  Measurement in direct current of: voltage, current, power and energy.

Measurement in alternate current of: voltage, current, power, active energy, reactive energy, apparent energy, cosphi and frequency.

Main technical features: DC voltage: 300 Vdc - DC current: 20 Adc - AC voltage: 450 Vac

AC current: 20 Aac  -Power: 9000 W

Power supply: single‐phase, 90‐260 V,50/60 Hz

Communication: RS485 with MODBUS RTU protocol

The unit must be supplied with manual in English language.

code

Description

Technical specifications

DL 2006E

LOAD CELL

Didactic equipment. Resistance electronic strain-gauge with 150 N range must be mounted on the braking system to measure the mechanical torque. The load cell shall consist in a precise bridge transducer, which will use special materials in order to get the best  performances.
The cell shall work by flexure, and the outgoing electric signal shall be proportional to the applied force and to the supply voltage. The cell shall be made up by special steel and must be OIMLR60 directive compliant.
Combined error: ≤ ±0.05%.
IP65 compliant
Technical Features:
Rated output 3mV/V ±5%
CREEP at nominal load in 30 minutes 0.05 %
Max supply voltage without damage 10 Volt
Input resistance 410Ω ±40
Output resistance 350 Ω ±5
Zero balance ± 2 %
Insulation resistance >2000 M Ω
Safe overload (% of Full Scale) 150 %
Ultimate overload (% of Full Scale) > 200 %
Deflection at nominal load 0.5 mm
Temperature:
Temperature effect on zero 0.005% °C
Temperature effect on span 0.005% °C
Compensated temperature range -10°C/ + 40°C
Operating temperature range -20°C/ + 60°C
The unit must be supplied with a manual in English language.

Item

Spec's

Q.ty

DL 1019M

EDDY CURRENT BRAKE - didactic equipment: Smooth roll rotor and salient pole stator.

Provided with two arms, one of which with graduated scale water level, weight and balance weight for measuring the output torque of the motor.

Housed in an aluminium box with PVC label and provided with a panel with safety terminals showing schematic diagram.

Possibility of assembling a load cell.

Technical features: Maximum supply voltage:  250 Vdc -  Maximum speed : 4000 rpm -

Maximum power in S3:  1.4 kW

It must be possible to couple the electrical machine with other electrical machines through a hub and spider elastic gear ring in polyurethane It must be supplied with a hooked module with safety terminals for the electrical connection.  

Each machine must be mounted on the base and must be provided with:

- Plate that brings its axis height to the standard measure (112 mm).

- Two plates for fixing to the base of the machine

- Four screws for fixing of the machine

 InterRail Distance of the plates:160mm

Coupling Joint: Diameter: 40mm, length 40mm

The unit must be supplied with a manual in English language.

Code

Description

Technical specifications

DL 8330SW

SOFTWARE AUTOMATIC DATA ACQUISITION

This system shall permit to execute, in an automatic or semi-automatic mode, under the control of the computer, all the tests normally executed inside the Electrical Machines Laboratory.
The system must  include:
Control Software
Acquisition Unit
Electrical Instruments
Electrical measurement modules
Mechanical measurement modules
DC and AC power supply
Electric loads
This software shall  be designed to detect electrical machines parameter in many working condition, through the data acquisition  interface; it must allow the data export, graph tracing and the computation of main parameters not directly acquirable.

It must be possible to perform the following experiments for asynchronous machines:
No load test of the Three-phase Asynchronous Motor
Short circuit test of the Three-phase Asynchronous Motor
Measurement of the internal resistance of a Three-phase  Asynchronous Motor
Measurement of the transformation ratio of the Three-phase Asynchronous Motor
Direct test of the Three-phase Asynchronous Motor with electro-magnetic brake
Direct test of the Three-phase Asynchronous Motor with D.C. Generator Brake
It must be possible to perform the following experiments for synchronous machines:
Magnetization Characteristic of a Synchronous Machine
Short-circuit Characteristic of a Synchronous Machine
Measurement of the Winding Resistance of a Synchronous Machine
External Characteristics of the Synchronous Machine
Regulation Characteristic of a Synchronous Machine
No load Test of a Synchronous Machine as a Motor
Parallel of the Synchronous machine with the Main
"V" curve plot of a Synchronous Machine

It must be possible to perform the following experiments for direct current  machines:
Measurement of the internal resistance of a Direct Current Machine
Computation of the conventional efficiency of a D.C. Generator
Magnetization characteristic of a D.C. Generator
External characteristics of the D.C. Generator
Regulation characteristic of the DC Generator
No load test of the Direct Current Motor
Direct test of the Direct Current Motor with Electromagnetic Brake
Direct Test of a D.C. Motor with D.C. Generator Brake
This eTraining Package must cover all the study subjects and the experiment activities to be performed in a computer controlled electrical machines laboratory.
It must work with the following types of machines:
•Single-phase and three-phase transformers
•Direct current machines
•Synchronous machines
•Asynchronous machines

code

Description

Technical specifications

DL 1893

INTERFACE UNIT

Didactic equipment: data acquisition unit with 8 analogue channels. Equipped with 2 relays and 2 analogue outputs. It must be possible to acquire continuous signals or slowly variable up to 100Hz.
Description: robust metal construction, USB interface for maximum PC compatibility
Clear interface for easy connection understanding
Technical Features
Direct power supply from USB, total consumption less than 120mA.
Nr. 2 relay outputs.
Nr. 2 analogue outputs, with:
                 12 bit D/A converter
                 Output levels: -10/+10 V
Nr. 8 analogue inputs, with:
                 Input levels: -10/+10 V
                 High impedance input amplifier: > 1MOhm
                 12 bit A/D converter
                 zero autotuning
                 Max sample rate: 10 kHz
Driver for Windows 2000,  XP, Vista, 7
The unit must be supplied with a manual in English language.