Type 5261

Frequency Converter Type 5261

The Frequency Converter Type 5261 is a training system for three-phase induction motors in the 100 W to 1 kW range. It offers four-quadrant operation, extensive protection functions, integrated measurement and indication, and terminal or PC control via RS 232.

For three-phase induction motors from 100 W to 1 kW
Four-quadrant operation with integrated control and indication
Parameter assignment via terminal or PC through RS 232
Protection against overcurrent, overvoltage, undervoltage, excess temperature, short-circuit and earth fault
Integrated measurement and display of current, voltage and frequency
Operation via membrane keyboard, LCD display or software

Datasheet (PDF) Data sheet (PDF) Experiment manual / contents (PDF) Send Inquiry

Application and operating range

With the Frequency Converter, hps SystemTechnik provides a training system for experiments in the field of speed control and speed regulation of three-phase induction motors.

The unit is designed for use with motors from 100 W to 1 kW and supports four-quadrant operation, integrated display functions and control via terminal or external PC.

Software and control

The included DFUwin software supports the U/f diagram, the travel diagram, current and voltage display, brake and start voltage display, and the simultaneous display of all parameters.

The software runs under Windows XP, Vista and Windows 7 in 32-bit and 64-bit editions.

Recommended accessories

The manual "Frequency Converter Digital" (Type V 0022), a three-phase induction motor Type 2707.1, the load Type 5512, the isolation amplifier Type 8630, the universal power supply Type 2740.1, a storage oscilloscope, the PC software 5261 EVGB, the RS 232 connecting lead Type 9102.50, the DC brake unit Type 2718 and the optional USB/RS 232 converter Type 9102.55 are listed as recommended accessories.

DC brake unit Type 2718

The DC brake unit is intended for use in drive engineering, for example in experiments with a three-phase induction motor and the frequency converter.

It can be used as a motor or as a generator and consists of a shunt-wound DC machine with integrated DC tachogenerator mounted on a base.

The experimental machine is pushed onto the base and held by a single-lever quick-action clamping device; a coupling collar Type 2718.5 is included.

Mechanical design

The front panel of the Frequency Converter is made of 5 mm thick laminate, matte blue in colour and engraved with white symbols representing the built-in function groups.

The additional machine, software screenshots and auxiliary components from the original product presentation are preserved as supporting material for the training system.

Software for U/f curve, travel diagram and live parameter display
Expandable with the DC brake unit and additional measuring accessories

Mains connection (single-phase): Voltage 230 V AC +/- 10 %, current consumption max. 6.3 A, mains frequency 48 Hz ... 400 Hz
Output: Output voltage 3 x 220 V, 0.5 ... 120 Hz; output current max. 4.5 A; limit frequency 120 Hz (adjustable)
Braking and acceleration ramp: 11.5 Hz/s ... 588.1 Hz/s
Pulse width modulation (PWM): Frequencies 2.0 kHz, 3.9 kHz, 7.8 kHz and 15.6 kHz
Protection functions: Overvoltage and undervoltage, overcurrent, excess temperature of the power unit, excess temperature of the motor, short-circuit and earth fault
SUB-D connection (9-pin): For control of the frequency converter with TTL level
Other: Control unit electrically isolated; braking resistor 150 Ohm / 50 W; inputs for setpoint frequency via built-in potentiometer or external 0 ... 10 V
Mechanical data: Front panel made of 5 mm thick laminate, matte blue, with white symbols engraved; dimensions 532 x 297 x 165 mm (W x H x D), weight approx. 6.2 kg
DC brake unit Type 2718: Shunt-wound DC machine with armature voltage and current 205 V / 2 A, field voltage and current 205 V / 0.33 A, power 0.3 kW at 2000 rpm, protection through thermal contact; DC tachogenerator with output 1: 10 V at 1500 rpm and output 2: 10 V at 3000 rpm; base material brushed stainless steel, dimensions 710 x 220 x 250 mm (W x H x D), weight 13.7 kg

1 Fundamentals1
1. 1.1 The three-phase induction motor with squirrel-cage rotor1
  1. 1.1.1 The structure of the motor1
  2. 1.1.2 The speed of the rotary field2
  3. 1.1.3 Torque and slip2
  4. 1.1.4 Characteristic points3
  5. 1.1.5 Speed control4
2. 1.2 Static converter systems for speed regulation of the three-phase induction motor7
  1. 1.2.1 General7
  2. 1.2.2 I-converter7
  3. 1.2.3 U-converter7
3. 1.3 Digital Frequency Converter (Type 5261) from hps10
  1. 1.3.1 General10
  2. 1.3.2 Constructional features of the power unit10
  3. 1.3.3 Function principle of an inverter11
  4. 1.3.4 Constructional features of the control unit14
2 Commissioning and measuring technique21
1. 2.1 Operation of the terminal21
  1. 2.1.1 Parameter, functions and basic settings21
  2. 2.1.2 Error messages of the Digital Frequency Converter (Type 5261)23
2. 2.2 The connection of a three-phase induction motor24
3. 2.3 Speed control, clockwise/anticlockwise rotation of a three-phase induction motor25
4. 2.4 LED rotating field and measuring points25
5. 2.5 Necessary accessories and measuring instruments26
6. 2.6 Safety instructions for handling the system27
3 The frequency converter software DFUwin29
1. 3.1 Software requirements29
2. 3.2 Hardware requirements29
3. 3.3 Software installation29
4. 3.3.1 Installation under Windows 3.1x29
5. 3.3.2 Installation under Windows 9529
6. 3.4 The U/f diagram30
7. 3.5 The travel diagram33
4 Experiments with Rs compensation35
1. Experiment 1: Max. perm. BOOST of a three-phase induction motor35
2. Experiment 2: LED field of rotation36
3. Experiment 3: Direction of rotation37
4. Experiment 4: Digital control signals of the frequency converter38
5. Experiment 5: Maximum deviation40
6. Experiment 6: Analog control signals of the frequency converter42
7. Experiment 7: U/f characteristic45
5 Experiments with the power unit47
1. Experiment 1: Intermediate circuit voltage47
2. Experiment 2: Effect of the brake chopper48
6 Experiments with the frequency control of a three-phase induction motor51
1. Experiment 1: Field of rotation speed, idle speed and idle slip51
2. Experiment 2: Frequency dependence of the idle current55
3. Experiment 3: Motor voltage depending on the PWM frequency57
4. Experiment 4: Speed and slip in sin. PWM59
5. Experiment 5: Speed and slip in trapez. PWM65
7 Experiments with acceleration and braking of a three-phase induction motor71
1. Experiment 1: Acceleration of a three-phase induction motor without load71
2. Experiment 2: Acceleration of a three-phase induction motor with load75
3. Experiment 3: Travel diagram with DFUwin81
8 Experiments with the speed control with a three-phase induction motor83
1. Experiment 1: Speed control independently of the load83
2. Experiment 2: Speed control with setpoint jump86
9 The synchronous machine89
1. 9.1 Fundamentals89
  1. 9.1.1 Structure of the machine89
  2. 9.1.2 Operating behaviour as a motor90
  3. 9.1.3 Connecting the machine92
2. 9.2 Experiments with the synchronous motor93
  1. Experiment 1: Max. perm. BOOST of a synchronous machine93
  2. Experiment 2: Acceleration of a synchronous motor without load94
  3. Experiment 3: Acceleration on load and sinusoidal PWM98
  4. Experiment 4: Acceleration on load and trapezoidal PWM102