GEFRAN-SIEI ARTDrive Vector V2 400Vac Series, Instruction Manual

Page: 67 / 387

ARTDrive V2 series - Instruction Manual Chapter 4 Wiring Procedure • 67
CASE B)
If
T
BR
> E
BR
/
P
NBR
that is to say, in case of very long braking time, it
must be dimensioned
P
MB
≤ ≤ ≤ ≤ ≤
P
NBR
Figure 4.8.2.3: Generic Braking Cycle with Triangular Profile
T
C
n,P
P
PBR
T
BR
t
P
MB
If none of the rules are met, it is necessary to increase the rated power of the
resistor, respecting the limit of the internal braking unit (reported in table 4.8.2.3),
or an external BU if necessary.
In order to protect these resistors from dangerous overload, software overload
control logic is also available (
STARTUP / Drv & Mot config / BUconfig
menu).
The default parameters in this menu match the recommended resistor pairing
as per table 4.8.2.1.
See chapter 7,
STARTUP / Drv & Mot config / BUconfig
menu, to set values
for a non-standard pairing.
Table 4.8.2.2: Braking Thresholds
Mains voltage Braking threshold
V
BR
[V]
230Vac 400
400Vac 680
460Vac / 480 Vac 780
575 Vac 965
av y 4200
When the duty cycle exceeds the data entered, the
BU overload
alarm
automatically occurs in order to prevent possible damages to the resistor.
The following table can be used to choose an external resistor, different from
the standard series.