Lenze i55 Series User Manual

11.5.1 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
brake 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.
Precondions
In order that the integrated brake chopper is acvated in the braking operaon, one of the
following braking methods must be set in 0x2541:001 (P706.01):
•
"Brake resistor [0]"
•
"Brake resistor + RFGS [2]"
•
"Brake resistor + IMB + RFGS [4]"
In the default seng of 0x2541:001 (P706.01), the integrated brake chopper is not acvated
in the brake operaon!
Details
•
The brake resistor required is to be connected to terminals R
B1
and R
B2
of the inverter.
•
In 0x2541:001 (P706.01), addionally the stopping funcon for the deceleraon ramp
funcon generator can be set when the brake resistor is controlled, in order to avoid over-
voltage disconnecon in the case of lower deceleraon mes.
•
In the default seng and with a disabled inverter and an error status ("Error acve"), the
brake chopper is switched o. This behaviour can be changed in 0x2541:006 (P706.06).
Example: In a DC-bus connecon with several inverters, only one brake resistor is used. It
is connected to the most powerful inverter in the DC-bus connecon. This inverter then
serves to change the behaviour so that inverter disable and/or an error does not cause a
switch-o of the brake chopper.
Internal protecve funcon
The following protecve funcon prevents the brake chopper from being switched on perma-
nently, e.g. due to too high voltages or wrong sengs:
•
The brake chopper is switched o if it was switched on over a period of 4 s.
•
If the DC-bus voltage again falls below the voltage threshold for braking operaon, the
brake chopper can again be switched on for maximally 4 s without interrupon.
Addional funcons
Brake energy management
Use of a brake resistor
445

Lenze i55 Series Specifications

General

Brand	Lenze
Model	i55 Series
Category	Inverter
Language	English