Download experiment 1 - Portal UniMAP

UNIVERSITI MALAYSIA PERLIS
ELECTRICAL ENGINEERING TECHNOLOGY
EMT 113/4
EXPERIMENT 1
LAB INTRODUCTION
NAME
PROGRAMME
MATRIK #
GROUP
DATE
EMT113/4
Lab Introduction
EXPERIMENT 1
TITLE: LAB INTRODUCTION
1. INTRODUCTION
The familiarization exercise consists of a step-by-step procedure that shows how to use
the Lab-Volt computer-based Metering window and Data Table. The exercise can be
performed using either the actual or virtual Lab-Volt Electromechanical System (EMS).
2. EQUIPMENT
PC with installation of LVVT software.
3. PROCEDURE
a) Setting up the equipment.
1. Turn on the PC.
2. Click the LVVT icon on the desktop.
3. Install the ;
a.) Mobile Workstation (must be installed in the Lab-Volt Laboratory before any
other equipment.
b.) Power Supply
c.) Resistive Load
d.) Data Acquisition Interface
in the EMS Workstation.
4. Make sure the Power Supply is turned OFF and its voltage control knob is set to
the 0 position. Connect the Power Supply to a three-phase power receptacle.
Note: The Power Supply is automatically connected to a three-phase power
source when it is installed in the Mobile Workstation.
5. Connect the LOW POWER INPUT Data Acquisition Interface (DAI) module to the
24 V – AC output to the Power Supply. On the Power Supply, set the 24-V AC
power switch to the I (ON) position. Notice that the POWER ON LED in the DAI
module lights up to indicate that power is supplied to the module.
6. Connect the equipment as shown in figure 1-1.
Note: The red terminal of inputs E1 and I1 on the DAI module correspond to the
terminals marked with a plus (+) sign in figure 1-1.
PUSAT PENGAJIAN KEJURUTERAAN MIKROELEKTRONIK
1
EMT113/4
Lab Introduction
AC NETWORK
VOLTAGE (V)
240
R1 (Ω)
1200
Figure 1-1: Simple resistive circuit.
Connect the DAI module to the computer.
Note: The DAI module is automatically connected to the computer when it is
installed in the Mobile Workstation.
On the Resistive Load module, set the resistance of resistor R1 to the value
shown in Figure 1-1.
b) Measuring Electrical Parameters Using the Metering Window.
7. Open the Metering window by choosing the corresponding command in the
Instruments menu. ( Instruments  Metering )
8. In the Metering window, make sure that the Extended Sampling Window is
selected. The metering window is now ready for measuring parameters in the
electrical circuit of Figure 1-2.
9. In the Metering window, set meter E1 as a DC voltmeter and meter I1 as a DC
ammeter. Turn ON meter PQS1 and set it as an active power (P) meter. Turn
OFF meters E2, E3, I2, and I3.
10. In the Metering window, select the Continuous Refresh mode by choosing the
corresponding command in the View menu. Turn ON the Power Supply. Observe
that meter E1 displays the DC source voltage, I1 displays the DC current
flowing in the circuit, and meter PQS1 displays the active power dissipated in
the resistor R1. Decrease the value of resistor R1 by closing the other two resistor
switches on the Resistive Load module.
PUSAT PENGAJIAN KEJURUTERAAN MIKROELEKTRONIK
2
EMT113/4
Lab Introduction
While doing this, observe that the values displayed by meters E1, I1 and PQS1
change to reflect the decrease in value of resistor R1, because the meter displays
are refreshed at regular time intervals when the continuous refresh mode is
selected.
11. Turn OFF the Power Supply. Replace the fixed-voltage DC power source with a
variable-voltage AC power source, as shown in Figure 1-2.
AC NETWORK
VOLTAGE (V)
240
R1 (Ω)
1200
Figure 1-2: Simple resistive AC circuit.
On the Resistive load module, set the resistance of resistor R1 to the value shown
in Figure 1-2.
12. In the Metering window, set meter E1 as an AC voltmeter and meter I1 as an AC
ammeter. In the Metering window, open the Meter Settings dialog box by
choosing the corresponding command in the Options menu. Set programmable
meter A as a frequency meter (function f (E1)) and programmable meter B as
an ohmmeter (impedance function RXZ (E1, I1)), turn ON these meters, and
close the Meter Settings dialog box. (Metering  Options  Meter Setting)
13. In the Metering window, select the Continuous Refresh mode. Turn ON the
Power Supply. Slowly turn the voltage control knob of the Power Supply until the
AC source voltage (displayed by voltmeter E1) is approximately equal to the AC
power network voltage. While doing this, observe that the meters are refreshed
continuously to reflect the variation of the measured parameters. Also observe
that programmable meters A and B indicate the AC power network frequency
and the value of resistor R1, respectively. Set the power voltage control knob to
the 0 position to reduce the AC source voltage to zero.
PUSAT PENGAJIAN KEJURUTERAAN MIKROELEKTRONIK
3
EMT113/4
Lab Introduction
c) Recording Data in the Data Table.
14. Open the Data Table window by choosing the corresponding command in the
Tools menu. ( Tools  Data Table )
15. In the Data Table window, record the values indicate by the meters in the
Metering window by choosing the corresponding command in the Edit menu.
( Data Table  Edit  Record Data )
16. The Record Settings dialog box should appear. This box allows you to select
the parameters whose values are to be recorded in the Data Table window. The
parameters measured by the meters that are turned ON in the Metering window
should be selected in the Record Settings dialog box (a check mark appears
beside each parameter selected). Click the OK button in the Record Settings
dialog box. This close the dialog box and record the values indicate by the
meters in the Metering window in the first row of the Data Table window.
17. On the Power Supply, increase the AC source voltage, in approximately 10
steps, until is approximately equal to the AC power network voltage. For each
voltage step, record in the Data Table window the values displayed by each
meters in the Metering window. Observe that a new row in the Data Table
window is filled up with data whenever a record data command is performed. Set
the Power Supply voltage knob to the 0 position. Turn OFF the Power Supply.
d) Plotting a Graph with the Recorded Data.
18. In the Data Table window, open the Graph window by choosing the
corresponding command in the View menu.
19. In the Graph window, plot a graph of the power delivered to resistor R1 (indicate
by meter PQS1) as a function of the voltage applied to this resistor (indicate by
meter E1). To do so, select voltage E1 as the X-axis parameter and power PQS1
as the vertical-axis parameter. Observe that a curve showing the variation of
power as a function of voltage appears in the Graph window when both
parameters are selected.
20. Close the Graph window. Close the Data Table window without saving the
recorded data.
e) Measuring Mechanical Parameters using the Metering Window.
21. Remove all equipment connections except the cable that connects the LOW
POWER INPUT of the DAI module to the 24 V-AC output of the Power Supply.
Install the Prime Mover / Dynamometer in the EMS Workstation. Connect the
fixed-voltage DC power source to the Prime Mover. To do so, connect terminal s
7 and N of the Power Supply to the terminals labeled PRIME MOVER INPUT 1
and 2 on the Prime Mover / Dynamometer, respectively.
PUSAT PENGAJIAN KEJURUTERAAN MIKROELEKTRONIK
4
EMT113/4
Lab Introduction
22. Connect the TORQUE and SPEED OUTPUTs of the Prime Mover /
Dynamometer to the T (torque) and N (speed) ANALOG INPUTs of the DAI
module, respectively. Connect the common terminal of the Prime Mover /
Dynamometer to the common terminal of the DAI module. These connections
are required to measure torque and speed. Connect the LOW POWER INPUT of
the DAI module to the LOW POWER INPUT of the Prime Mover /
Dynamometer. Notice that the POWER ON LED on the Prime Mover /
Dynamometer lights up to indicate that power is supplied to the module. On the
Prime Mover/ Dynamometer, make the following settings:
MODE selector………………………………….....PRIME MOVER
DISPLAY selector……………………. …………………….SPEED
23. In the Metering window, turn OFF all meters then turn ON the Torque (T) and
Speed (N) meters. Turn ON the Power Supply. Observe that the Prime Mover
starts to rotate. Also observe that meter N indicates the rotation speed of the
Prime Mover and meter T indicates the torque produced by the Prime Mover to
overcome the torque that opposes rotation (this torque is mainly due to friction).
24. Turn OFF the Power Supply. Observe that the Torque and Speed indicate by
meters T and N decrease to zero. In the Metering window, select the manual
refresh mode. Close the Metering window. Remove all equipment connections.
PUSAT PENGAJIAN KEJURUTERAAN MIKROELEKTRONIK
5