ARTDrive V2 series - Instruction Manual
Chapter 4 Wiring Procedure • 63
4.8 Braking Units
In oversynchronous or regenerative operation, the frequency-controlled three-
phase motor feeds energy back to the DC link circuit via the Drive. This leads to
an increase in the intermediate circuit voltage. Braking units (BU) are therefore
used in order to prevent the DC voltage rising to an impermissible value. When
used, these activate a braking resistor that is connected in parallel to the
capacitors of the intermediate circuit. The feedback energy is converted to heat
via the braking resistor (R
BR
), thus providing very short deceleration times and
restricted four-quadrant operation.
Figure 4.8.1: Operation with Braking Unit (Principle)
E
3
M
_
R
B
R
B
U
U
ZK
AVy...-4 (230...480Vac)
Drive models 1007 to 3150 have an internal braking unit as standard (external
resistor required).
Drive models 4220 to 5550 have an internal braking unit as optional.
AVy...-5 (575Vac)
Drive models 2002 to 3020 have an internal braking unit as standard (external
resistor required).
Drive models 4025 to 5075 have an internal braking unit as optional.
All standard ARTDrive devices can be connected via terminals C and D with an
external braking unit (BU-32, BUy-...).
The braking resistors can be subject to unforeseen overloads due to
possible failures.
The resistors have to be protected using thermal protection devices. Such
devices do not have to interrupt the circuit where the resistor is inserted
but their auxiliary contact must interrupt the power supply of the drive
power section.
In case the resistor foresees the precence of a protection contact, such
contact has to be used together with the one belonging to the thermal
protection device.
N
OTE
!
For braking resistor connection (terminals BR1 and C) a twisted cable has to be
used.
In case the braking resistor is supplied with thermal protection (klixon), it may
be connected to the "External fault" drive input.
Содержание ARTDrive Vector V2 400Vac Series
Страница 1: ...Instruction Manual ARTDrive ARTDrive Vector AC Drives V2 series 400Vac Class 575Vac Class...
Страница 14: ...0 14 Chapter 0 Safety Precautions ARTDrive V2 series Instruction manual...
Страница 40: ...40 Chapter 3 Installation Guidelines ARTDrive V2 series Instruction Manual...
Страница 92: ...92 Chapter 5 Quick Start Up Guide ARTDrive V2 series Instruction Manual...
Страница 358: ...358 Chapter 8 Appendix ARTDrive V2 series Instruction Manual...
Страница 376: ...Chapter 9 Pick Lists 376 ARTDrive V2 series Instruction manual...