Lenze I95AE240F User Manual

18 Addional
funcons
18.1 Brake energy management
When braking electrical motors, the kinec energy of the drive train is fed back regeneravely
to the DC bus. This energy causes a DC-bus voltage boost. If the energy fed back is too high,
the inverter reports an error.
Several dierent strategies can serve to avoid DC-bus overvoltage:
•
Stopping the deceleraon ramp funcon generator when the acve voltage threshold for
the brake operaon is exceeded
•
Use of the "Inverter motor brake" funcon
•
Combinaon of the above named opons
Details
The voltage threshold for braking operaon results on the basis of the rated mains voltage set:
Rated mains voltage Voltage thresholds for braking operaon
Braking operaon on Braking operaon
o
230 V DC 390 V DC 380 V
400 V DC 725 V DC 710 V
480 V DC 780 V DC 765 V
Parameter
Address Name / seng range / [default seng] Info
0x2541:003 Brake energy management: Reduced threshold
0 ... [0] ... 100 V
The voltage threshold for the braking operaon is reduced by the volt-
ag
e value set here.
18.1.1 Use of a brake resistor
For braking operaon,
oponally the brake chopper integrated in the inverter (brake transis-
tor) can be used.
NOTICE
Incorrect dimensioning of the brake resistor may result in the destrucon of the integrated
br
ake chopper (brake transistor).
▶
Only connect a brake resistor complying in terms of performance to terminals R
B1
and R
B2
of
the inverter.
▶
Avoiding thermal overload of the brake resistor.
Parameter
Address Name / seng range / [default seng] Info
0x2550:001 Brake resistor: Minimum resistance
•
R
ead only: x.x Ω
Display of the minimum brake resistance value that can be used.
0x2550:002 Brake resistor: Resistance value
0.0 ... [180.0] ... 500.0 Ω
Resistance value of the brake resistor connected.
•
The value to be entered can be obtained from the brake resistor
nameplate.
0x2550:003 Brake resistor: Rated power
0 ... [5600] ... 800000 W
Rated power of the brake resistor connected.
•
The v
alue to be entered can be obtained from the brake resistor
nameplate.
0x2550:004 Brake resistor: Maximum thermal load
0 ... [485] ... 1000000 kW
s
Thermal capacity of the brake resistor connected.
•
The value to be entered can be obtained from the brake resistor
nameplate.
0x2550:006 Brake resistor: Reference resistance Selecon of the reference value for the brake resistor.
0 Minimum resistance
1 Resistance value
0x2550:007 Brake resistor: Thermal load
•
Read only: x.x %
Display of the ulisaon of the brake resistor connected.
Addional
funcons
361

Lenze I95AE240F Specifications

General

Brand	Lenze
Model	I95AE240F
Category	Inverter
Language	English