Experiment Instructions Four-Quadrant Drive
English

• Electronics technician for operating technology
• Electronics technician for automation technology
• Mechatronics technician

General description

• Power section
• Operating modes of the four-quadrant drive
• The ignition modules Z1 and Z2
• The blocking logic (circular current logic)
• Speed controller
• The current regulators 1 and 2
• The enable signal
• Field voltage generation

The direct current shunt machine

• Valve types (short version of the most important types)

Two-pulse bridge circuits B2

• B2 circuit with resistive load/diodes
• B2 circuit with R and L (ωL>>R)/diodes
• Fully controlled B2 circuit with resistive load/thyristors
• Fully controlled B2 circuit with R and L (ωL>>R)

Principle of a speed control

• Basic principle of a closed-loop control
• The P-controller
• The I-controller
• The PI controller
• Block diagram (principle circuit diagram) of a speed control of a direct current machine

Experiment section

• General information
• Commissioning Instructions

Experiments

• Determination of the field voltage UE of the four-quadrant drive (Type 5255) Measurements on the

Speed controller

• Measurements on the current controllers
• Ignition pulses
• Characteristic curve of the tachogenerator
• Ohmic load of the thyristor bridges
• Maximum speeds in motor operation with different controller settings
• Voltage curve of the armature voltage UA1, A2 of the DC shunt motor at regenerative load
• Dynamic control behaviour of the speed controller in the case of abrupt application of speed changes and disturbance variables
• Generator operation of the DC shunt machine M1 (directly connected to the thyristor), inverter operation, transition behaviour

Experiment instructions "Four-Quadrant Drive" (incl. CD-ROM)