Description; Standard - gefran BUy-1020 Manuel D'utilisation

The BUy-... braking unit consists of a static switch (IGBT) controlled by the voltage in the
inverter intermediate circuit (DC Link).
When a fixed voltage threshold is exceeded (it can be selected using the switches, not for
the BUy-1075-5 and BUy-1065-6 models), the static switch is closed connecting a resistor
across the DC link dissipating the developed energy. It is possible to obtain faster deceler-
ations and to avoid the tripping of the inverter "overvoltage" protection caused by a sudden
increase in the DC Link voltage.
You can obtain maximum configuration of several parallel braking units that operate simul-
taneously by connecting the units in parallel using terminals C and D, and arranging the
braking command in a cascade connection (master/slave function).
A protection circuit has been implemented in order to protect the IGBT against possible short
circuits of the braking resistor connections.
Other protections are:
- Heatsink thermal protection.
- Power supply voltage control.
The trip can be reset, after the alarm condition has been cleared, via a button on the unit or
via a remote dedicated command.
A command allows a quick discharge of the inverter intermediate circuit.
Such command must be directly interlocked with the contactors supplying energy
to the inverters.

1.1. Standard

Climatic conditions
Clearance and creepage
Vibration
Approvals
Protection degree:

1. Description

IEC 68-2 Part 2 and 3
EN 50178, UL508C (*), UL840 degree of pollution 2 (*)
IEC68-2 Part 6
CE; UL, cUL (*)
IP20
(*) not for the BUy-1065-6 model.
—————— Braking Unit —————— 36-GB