I PE-1
Electrical Power & Machines
Powerframes - Power Electronics
The study of power electronic devices, drives
and circuits is an essential part of any course
on modern electrical systems. The Series 70
Power Electronics trainers and modules
cover the principles, characteristics and
operation of single and three phase electronic
motor and power control devices and circuits
and have been designed to provide a
comprehensive course on modern theory and
practice.
The Series 70 Power Electronics trainers
and modules form part of the Powerframes
System: a flexible and cost-effective way to
build a Power and Machines laboratory facility.
Three products are available that can be
chosen to provide a course of study that fits
your training requirements. These are:
Thyristor Control Principles
70-002
Thyristor & Motor Control
70-003
dc Motor Control
70-005
The system is so designed that the Thyristor
Control Principles Trainer 70-002 can be
used to teach dc Motor Control by the
inclusion of additional units available in an
upgrade package 70-004.
The systems operate from Three Phase
supplies, five wire connection including Earth,
of 230V/400V @ 50/60Hz 800VA max.
Similar systems operating at 120V-208V and
60Hz are also available. See Ordering
Information for details.
Electrical Power & Machines
Series 70 Power Electronics Trainers
Thyristor Control Principles
70-002
This trainer comprises a Firing & Bridges panel, a Three Phase Supply Panel and all of the loads,
instrumentation, etc to enable the study of the principles and operation of Single and Three Phase
thyristor circuits.
Curriculum Coverage
The Thyristor Control Principles trainer provides
extensive training in the principles of thyristor
control circuits. The trainer can be used as the
basis of a programme, starting with the principles
of uncontrolled rectification to simple control
using thyristors, then progressing through Single
and Three Phase controlled rectification with their
associated firing requirements.
The characteristics of various loads: inductive,
capacitive and resistive, are studied under half
and full-wave, Single and Three Phase
rectification, both controlled and uncontrolled.
Equipment List
Three phase supply
Variable Resistive Load 200 Ohms
Switched 3 Phase Resistive Load
Switched Capacitive Load
Variable Inductive Load 700mH
Moving Iron Voltmeter & Ammeter
ac/dc Digital Voltmeter/Ammeter
4mm Patch Lead Set
Firing Circuits & Bridges
System Frame
Oscilloscope/Computer Housing
Lead Storage Bin
The range of assignment work that can be carried
out with the trainer includes:
Uncontrolled Rectification Circuits
· Single Phase half wave
· Single Phase full wave
· Three Phase half wave
· Three Phase full wave
Controlled Rectification Circuits
· Single Phase half wave
· Single Phase full wave
· Three Phase half wave, star connected supply
· Three Phase full wave, full controlled bridge
Output from the various converters are
measured for average and rms values in
conjunction with the various RLC load
combinations.
Basic Firing Circuits
· firing circuit requirements
Advanced Firing Circuits
· thyristor phasing
· multipurpose firing circuits
Single and Three Phase
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Electrical Power & Machines
Series 70 Power Electronics Trainers
Thyristor & Motor Control
70-003
This Trainer comprises a Firing & Bridges panel, a Motor Control Circuits panel, a Three Phase Supply
Panel, SCR & Diodes Panel, and all of the loads, instrumentation, etc to enable the study of the
principles of Single and Three Phase rectification applied to passive loads and to apply these thyristor
circuits to the control of dc motors.
Curriculum Coverage
In addition to all of the work covered by the
Thyristor Control Principles trainer, the Thyristor
and Motor Control trainer enables the study of
dc motor control. Motor speed and current
control circuits may be investigated with various
types of feedback, including PI control and 4
Quadrant control. Zero crossing and burst firing
circuits are also covered. The range of
assignment work that can be carried out with the
trainer includes:
Uncontrolled Rectification Circuits
· Single Phase half wave
· Single Phase full wave
· Three Phase half wave
· Three Phase full wave
Controlled Rectification Circuits
· Single Phase half wave
· Single Phase full wave
· Three Phase half wave, Star connected supply
· Three Phase full wave, full controlled bridge
Output from the various converters are
measured for average and rms values in
conjunction with the various RLC load
combinations.
Basic Firing Circuits
· firing circuit requirements
Basic Motor Control
· Single Phase full wave, uncontrolled bridge
· Single Phase full wave, controlled bridge
· the flywheel diode
Advanced Firing Circuits
· thyristor phasing
· multipurpose firing circuits
Advanced Motor Control
· feedback measurement
· full wave controlled bridge with speed
feedback
· PI control
· full wave controlled bridge with armature
voltage feedback
· full wave controlled bridge with VI feedback
4 Quadrant Control
· dual converter - Single Phase
· dual converter - Three Phase
· converter selection by control signal
· converter selection by load current
· converter selection by control signal & load
current
· continuous & discontinuous current operation
· bi-directional speed & current control
· bi-directional control time behaviour
· regenerative braking
· effects of inertia on system performance
ac Power Control
· Single Phase ac control
· Three Phase ac control
· burst fire control
Equipment List
Three Phase Supply
dc Shunt Machine
Variable Resistive Load 200 Ohms
Switched 3 Phase Resistive Load
Switched Capacitive Load
Variable Inductive Load 700mH
Inertia Load
Friction Brake
Moving Iron Voltmeter & Ammeter
ac/dc Digital Voltmeter/Ammeter
dc Tachogenerator
Optical/Contact Tachometer
4mm Patch Lead Set
5 Way DIN-DIN Lead
SCR & Diodes
Firing Circuits & Bridges
Motor Control Circuits
System Frame
Oscilloscope/Computer Housing
Lead Storage Bin
This panel provides at its outputs the working
supplies for the power devices on the Firing
Circuits and Bridges panel. Three transformers,
one for each Phase, are used to provide Three
Phase outputs of 200VA for each Phase or they
can be combined to produce a Single Phase
output of 600VA.
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Electrical Power & Machines
Series 70 Power Electronics Trainers
dc Motor Control Trainer
70-005
This Trainer comprises a Firing & Bridges panel, a Motor Control Circuits panel, a Three Phase Supply
Panel, SCR & Diodes Panel, and dc motor, instrumentation, etc to enable the study of the principles of
Single and Three Phase thyristor circuits and their application in the control of dc motors.
Assignment Courseware
The assignment work is covered in a teaching
manual. These include background, practical
work, questions and answers. This manual can
be used as the basis of a complete course on
power electronics.
Curriculum Coverage
The dc Motor Control trainer enables the study
of dc motor control in both Single and Three
Phase circuits. Motor speed and current control
circuits may be investigated with various types
of feedback, including PI control and 4
Quadrant control.
The range of assignment work that can be
carried out with the trainer includes:
Basic Firing Circuits
· firing circuit requirements
Basic Motor Control
· Single Phase half and full wave, controlled bridge
· Three Phase half and full wave, controlled bridge
· the flywheel diode
Advanced Firing Circuits
· thyristor phasing
· multipurpose firing circuits
Advanced Motor Control
· feedback measurement
· full wave controlled bridge with speed feedback
· PI control
· full wave controlled bridge with armature
voltage feedback
· full wave controlled bridge with VI feedback
Equipment List
Three Phase Supply
dc Shunt Machine
Variable Resistive Load 200 Ohms
Variable Inductive Load 700mH
Inertia Load
Friction Brake
ac/dc Digital Voltmeter/Ammeter
dc Tachogenerator
Optical/Contact Tachometer
5 Way DIN-DIN Lead
4mm Patch Lead Set
SCR & Diodes
Firing Circuits & Bridges
Motor Control Circuits
System Frame
Oscilloscope/Computer Housing
Lead Storage Bin
Thyristor Control Upgrade
70-004
The Thyristor Control Upgrade is available to
customers who have Thyristor Control Principles,
70-002, and wish to extend the work covered to
all that of Thyristor & Motor Control, 70-003.
Equipment List
dc Shunt Machine
Inertia Load
Friction Brake
ac/dc Digital Voltmeter/Ammeter
dc Tachogenerator
Optical/Contact Tachometer
5 Way DIN-DIN Lead
SCR & Diodes
Motor Control Circuits
4 Quadrant Control
· dual converter - Single Phase
· dual converter - Three Phase
· converter selection by control signal
· converter selection by load current
· converter selection by control signal & load current
· continuous & discontinuous current operation
· bi-directional speed & current control
· bi-directional control time behaviour
· regenerative braking
· effects of inertia on system performance
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Electrical Power & Machines
Series 70 Power Electronics Equipment
Three Phase Supply
dc Shunt Machine
Supply requirements
· Three Phase five wire connection
· L1, L2, L3, Neutral and earth
· 380-415V @ 50Hz 800VA
Mounted on a prefabricated base equipped
with quick-release catches and locating pins
allowing easy coupling with other motor/
machines, drives and loads in the 60 series
range. Each machine is fitted with a mimic
schematic plate and connections are made
using shrouded 4mm safety connectors.
A mimic diagram on the front panel depicts the
transformers circuit and supply connection.
Transformers have two secondary windings,
each of 100V ac @ 1A.
They are connected in series of parallel, Star or
Delta to provide a range of output voltages.
A separate dc output of 220V @ 1A is available.
Four bus bar connections are available for
transformer interconnection and supply
distribution purposes.
Connections
· Three Phase supply input by 14 way socket
on a 2m lead, to be terminated to customer
supply.
· Single Phase output on IEC socket, 230V @ 2A
at the rear panel
· Interconnection of transformer supplies by
4mm plug leads.
· Two protective earth terminals are available
for connection to external equipment.
Controls/Circuit protection
· Three Phase thermal/magnetic breaker with
ON/OFF push buttons.
· Primary power switch to select Three Phase or
Single Phase operation with off position.
· Three power on indicators, one for each
Phase.
· Single Phase outlet fused at @ 2A(T)
20mm×5mm on an IEC socket on the rear
panel.
· Rated at 250W with separately wound
shunt field
· Nominal supply 180/220V dc armature and
field
· Suitable for operation with separately excited
or self-excited connections
· Can be used as a dc generator
· Nominal speed 3000 rev/min
Variable Resistive Load 200W
W
High power variable resistance element for use
where high power dissipation is required in
applications such as:
· Generator Loading
· Motor starting
· Motor speed control applications
Three Phase switched resistive load
Three switched resistive load banks
· 7 resistive values per bank
· 550 - 3770 ohm per bank
· Rated at 100w per bank @ 230V
· Total resistive range 183 - 11,310 ohms
Capacitive load
· Single Phase switched capacitive load
· Five possible capacitance values
· 10µf, 20µf, 30µf, 40µf and 50µf
Optical/Contact Tachometer
· Versatile measuring of shaft speed
· Non-contact by photo sensing
· Direct shaft contact through conical rubber
drive
· Measurement range 99,999 rev/min
non-contact, 20,000 rev/min contact
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Electrical Power & Machines
Series 70 Power Electronics Equipment continued
Inertia Wheel
Designed for use with the electrical machines this
unit fits onto the non drive end of the dc shunt
motor. It provides an additional inertia load when
investigating control system behaviour in 2, 4 ,8
or 12 pulse convertor drives.
A cover is also provided to restrict access and
protect from hazards.
The dimensions of the wheel are
100mm×25mm of material, mild steel, with a
mass of 1.5kg.
Friction Brake
· Fits directly onto the shaft of the machine
· Provides direct loading with integral
measurement of the torque output of the
motor assemblies under test
· Indicates torque output in either direction up
to ±2Nm
Moving Iron Voltmeter
& Ammeter
For use on ac or dc circuits
· Voltages ranges up to 500V
· Current range to 3A
· Ammeter is fuse protected
· Meters are to DIN standard 96x96mm
ac/dc Digital Voltmeter/Ammeter
· Panel mounted to fit into frame
· Multi-range voltage, amperes, ac/dc on one
rotary switch
· Separate on/off switch maintains range
setting.
· Battery powered
· Uses standard safety plug leads
· Fused current ranges
dc Tachogenerator
For use with 60 series electrical machines.
· Attaches to motor base and shaft to provide a
dc voltage or current output for connection
to electronic systems or speed indicators.
· Output 2V dc/1000 to 6000 rev/min
· Connection 5 pin 180º DIN connector.
Variable Inductive Load
· A load consisting of variable 700mH inductive
components rated at 1A 220V 50Hz
· Variation is by means of an infinitely variable
iron core.
· Total loading is rated at 220VAR
· Rates at 250V ac
· Fuse protected against excessive overload
4mm Patch Leads
For interconnections between panels and
bench mounted equipment,the leads are fitted
with 4mm stackable shrouded safety
connectors made from double insulated cable.
All front panel power connections on the
equipment are made with shrouded plug leads.
5Way DIN-DIN Lead
1m long, this lead is used to connect between
the tachogenerator unit (68-430) and the motor
controller or speed indicator.
SCR & Diodes
The unit extends the use of the Firing Circuits and
Bridges panel by providing a second set of power
diodes and thyristors. From these, a thyristor
converter can be interconnected to form, with
the Bridges panel, a dual converter, either Single
Phase or Three Phase, to control power to a
passive or active load such as a dc motor.
The front panel mimic shows six diode and six
thyristors together with voltage and current probes.
Supply requirements
· Three Phase five wire connection at the rear
panel, L1, L2, L3, neutral and earth supplied
via the Bridges panel from the Three Phase
Supply 60-132
· Operating voltage- nominally 170V 50/60Hz
Three Phase
Isolated voltage probe with an output of 1/50th
and an output limit of ±10V
Isolated current probe with an output of 1:1
and an ouput limit of ±10V
Circuit protection
· Power devices protected from current over
load by fast acting fuses in the Three Phase
supply lines
· 3×8A (FF) Size ‘0’ (1¼”×¼”)
Connections
· Three Phase connection at the rear panel by
14 way plug and socket lead to the Three
Phase power supply 60-132
· 4mm shrouded plug leads for
interconnection of the power devices and
probe inputs
· 2mm shrouded plug leads for probe outputs
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Electrical Power & Machines
Series 70 Power Electronics Equipment continued
Firing Circuits & Bridges
The Firing & Bridges panel contains the diode
and thyristor devices required for Single and Three
Phase uncontrolled and controlled rectification
together with the firing circuits for the thyristors.
The panel also contains the power supplies
required for operating the firing circuits, and
isolated voltage and current probes for use in
waveform observation and control purposes.
Supply Requirements
Two supply connections are required
1) 230-250V ac 50/60Hz or 100-125V
50/60Hz, 60VA for electronic circuits
2) 170V ac 50/60Hz, 3-phase with neutral
conection @ 600VA max from Three
Phase Power Supply 60-132
The unit contains
· Front panel mimic diagram of circuits and
devices
· Six power diodes and six thyristors that can
be connected into various circuit
configurations with 4mm plug leads
· Three individual firing pulse circuits that can
be connected to produce firing pulses for
Single and Three Phase circuits; one, two,
four and six pulse options, ac or dc
· Firing pulse selector, 0-180º or 180º and 360º
or overlap firing pulses can be selected
· Reference voltage output control, 0-10V,
±10V or off by selector switch
· Isolated voltage probe output of 1/50th
Associated variable output control
Max output ±10V
· Isolated current probe with 1:1 ratio
· Associated variable output control
Max output ±10V
· dc output for motor field supply applications,
220V @ 1A
Circuit protection
· Power devices protected with fast acting fuses
in the Three Phase supply lines
· 3×8A (FF) size ‘0’ (1¼ inch×¼ inch)
· Single Phase mains fuse (20mm×5mm)
250mA(T)
Motor Control Circuits
Designed to be used with Firing Circuits and
Bridges panel, this unit provides the control
circuits for motor control and zero crossing burst
fire study. A mimic diagram depicts the overall
available circuits for motor control and these can
be interconnected to perform various different
control scenarios. A second circuit is shown for
burst fire control that is interconnected to the
bridge circuits for study of ac power control.
Monitor sockets are provided at various points in
the circuits to enable a voltmeter or an
oscilloscope to be used for measurement.
Burst fire circuit controls
· Set power level
· Error amplifier gain
· Pulse interval time control
Motor control circuit controls
· Reference voltage control 0-10V, ±10V
or OFF by selector switch
· Acceleration/deceleration time
· Speed controller proportion gain
· Speed controller Integral action time
· Current controller proportional gain
· Current controller Integral action time
· Current limit variable control
· Separate variable attenuator
Inputs with filters are provided for dc
tachogenerator and armature voltage.
Non filtered inputs are available for current and
external sources.
Electronic Circuit blocks
· P+I Speed controller
· P+I current controller
· Precision full wave rectifier, positive output
· Precision full wave rectifier, negative output
· Summing amplifiers for speed and current
circuits
· Variable time ramp circuit
· Comparator and decision logic with polarity
indicating LED’s
Connections
· Patching leads are 2mm and 4mm shrouded
types
· Single Phase mains by IEC 3 pin socket
· Three Phase supply by 14 way socket to 4mm
plug lead (supplies from 60-132)
· Three Phase output, connection for use with
SCR & Diodes panel 70-100
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Electrical Power & Machines
Series 70 Power Electronics Equipment continued
Motor Control Circuits
A separate variable free running oscillator
produces triangle and square wave outputs to
drive the system continuously when evaluating
the system response.
Protective circuits
The speed, current and ramp circuits are clamped
to zero when the power to the Bridge Circuits
panel is switched on or off. This hold condition
is indicated by a LED on the front panel.
Connections
Power is supplied to the unit from the bridge
circuits panel via a 16 way ribbon socket
interconnecting lead.
All circuit monitor points and interconnections are
made with shrouded 2mm plug leads.
System Frame
· Easy ‘lift-in/out’ panel removal
· Maximises bench space
· Provides clear view of multi-panel experiments
Oscilloscope/Computer Housing
· Suitable for conventional desktop computer
and oscilloscope cases
· Can be positioned anywhere in the A4 area
of the frame
· Aperture opening: Width 410mm, Height
200mm, Depth 495mm
· Used in conjunction with 91-230 VDU &
Keyboard Mount when installing a complete
computer system
Universal Lead Storage Bin
· Holds items associated with the Powerframes
System
· Can be used in either landscape or portrait
format
Ancilliary Equipment
Dual trace oscilloscope 20MHz, preferably with
digital storage or with a long persistance tube.
A suitable oscilloscope is available from
Feedback and can be ordered under the
number 9999-01440.
Ordering Information
Please quote the following product names & numbers when ordering equipment:
Systems operating at 230V/400V @ 50/60Hz
Thyristor Control Principles
Thyristor & dc Motor Control
dc Motor Control Upgrade
dc Motor Control Trainer
Digital Storage Oscilloscope
with PC interface
70-002
70-003
70-004
70-005
9999-01440
Systems Operating at 120V/208V @ 60Hz
Thyristor Control Principles
Thyristor & dc Motor Control
dc Motor Control Upgrade
dc Motor Control Trainer
Digital Storage Oscilloscope
with PC interface
70-032
70-033
70-034
70-035
9999-01440
For further information on these and other equipment in the Feedback range please contact . . . . . . .
ParkRoad,Crowborough,
East Sussex, TN6 2QR, England.
Telephone: +44 (0) 1892 653322.
Fax: +44 (0) 1892 663719.
E-mail: feedback@fdbk.demon.co.uk
Website: http://www.fbk.com
Feedback reserves the right to change these specifications without notice.
Registered in England number 990620.
A subsidiary of Feedback plc.