Wenglorz - Dipl. Ing. Helmut Wenglorz GmbH

DC BRAKING EQUIPMENT


Thyristor - Braking Unit BGT
Braking Current IB and Braking Time tB adjustable

Diode - Braking Unit BGD
Braking Time tB adjustable

Long flow times of machines are often inadmissible because of danger to persons. Thus the German trade association for wood determined in its regulations VBG 7j that all the tools by hand are reached must come stop after switching off within 10 sec. Long outflow times cost money as unproductive dead times and are often reason for damage if is not waited till to deadlock for new engine starts. A logic program automates the release of the braking unit for a new start. Another problen f.e. is the unwanted resonance frequency, when unbalance motors, which are used for driving vibration and swing equipment, are stopped without brake. With a DC brake the complete drive system is slowed down so quickly that the resonance frequency does not become effective.

 
Application area Criteria of the logic program
Pumpen, Kompressoren, Lüfter, Transportbänder, Rollgänge, Rüttelsiebe, Brecher, Mühlen, Rührwerke, Zentrifugen, Holzbearbeitungsmaschinen, Schleif- und andere Bearbeitungsmaschinen
  • Braking contactor leads only the braking current, it does not switch the power
  • Braking initiation after optimal time depending on the size of moment of inertia
  • Braking initiation depending on the motor data
 
Mode of operation General
BGD and BGT braking devices are used for electronic braking of 3-phase and 2-phase AC motors with direct current. The stator winding of the motor is disconnected from the network and is connected to a adjustable DC produced in the brake unit. This creates a physically unchanging DC field that induces an alternating voltage in the rotating motor, whose frequency is proportional to the decreasing speed speed. 12.5. The generated rotor current forms with the above mentioned DC field a braking torque that brakes the drive system up to very small speeds and becomes only with the stop zero. The engine cannot run up in opposite direction. The braking torque is not constant during the braking process because the size of the rotor current is determined by the ohmic winding resistance and speed-dependent reactance.
  • Bremskreisabsicherung, ausschließlich superflink
IB/A253570110150200300350450
Si/A253570110150200300350450
  • Prüfvorschriften: VDE/DIN 0160 und 435a
  • Luft- und Kriechstrecken: VDE/DIN 0113 Gr. C
  • EMV-Richtlinie (CE-Kennzeichen)
  • Umgebungs-/ Lagertemperatur 0 bis +45°C / -20 bis +65°C
  • Platinen: gedruckte Schaltung mit Lötstoplack >
  • Option für alle Geräte: erhöhte Schutzart
  • Größere Bremsleistungen auf Anfrage (Standard bis 450A)
Type Code

 
Breaking profile Documentation
The braking happens according to a defined logic program generated in the braking equipment to guarantee a drive-optimal and a timely braking course. The runnning-up of the motor is detected and stored for types BGT 35 and BGT 40 when the braking is initiated by the EMF. After switching off the motor the braking operation is initiated only when the remanence voltage of the motor has dropped to a non-critical value related to the power semiconductor. The EMF-dependent braking initiation can also be used for positioning of drive units when the required tolerance limits are not too ambitious; among other things the repeatability depends on the constancy of the centrifugal moment of the complete drive system you have
00.1 a. o. Application, mode of operation, braking profile
00.1 Technical data and planning notes
01.1 BGD > Generally, mounting, commissioning
01.2 BGD > Basic circuit, wiring diagram, dimension
02.1 BGT 31 > data, mounting, commissioning, troubleshooting
02.2 BGT 31 > basic circuit, wiring diagram, dimension, diagr.
03.1 BGT 35 and BGT 40 > basic circuit, wiring diagram
03.2 BGT 35 and BGT 40 > functional diagram
03.3 BGT 35 and BGT 40 > commissioning
03.4 BGT 35 and BGT 40 > troubleshooting
04.1 BGT 35 > Dimension 35A-150A without display
04.2 BGT 35+40 > Dimension 150A-250A with display
04.3 BGT 40 > Dimension 300A-450A with display