● Do not connect brake chopper input terminal -(N ) to the
neutral point of the power supply.
● Confirm the polarities of the brake chopper input terminals +
(P) and -(N), otherwise the brake chopper will break down
immediately at the startup phase of the braking process.
● The wiring distance between the brake chopper and the fre‐
quency converter should be not more than 5 m (16.4 ft). The
wiring distance between brake chopper and brake resistor
should be not more than 10 m (32.8 ft).
The brake resistor connections at the brake
chopper (terminals P1 and PB) have no short
circuit protection! Wrong wiring will cause
damage to the components!
Please ensure the reliable grounding of the brake chopper.
The settings of the brake chopper
Fig. 10-11: Brake chopper settings
Selection of braking voltage
The 400 V class brake chopper has 5 operating voltages (630 V, 660 V, 690
V, 730 V, 760 V), and power supply of the brake chopper is from +(P), -(N) of
the frequency converter. This setting will influence the level of the operating
voltage of the brake chopper, which is an important procedure. Please switch
the jumpers to the needed operating voltage position, the factory default val‐
ue of JP1 is 690 V.
The input voltage of the power supply
to the frequency converter [V]
380 400 415 440
Braking startup voltage [V] 660 690 730 760
Tab. 10-7: Recommended startup braking voltage
● Master/Slave setting:
The brake chopper sets JP2 on “MASTER” as factory setting. The mas‐
ter brake chopper will select “MASTER” and the slave unit will select
“SLAVE” when two or more brake choppers are applied in parallel.
● Fault output selection:
The temperature failure output of the brake chopper is T1-T2; operating
temperature is +85 °C. T1-T2 is set normally open as factory default; if
normally closed is required, please set JP3, and short circuit 1-2.
DOK-RCON02-FV*********-IB08-EN-P Bosch Rexroth AG 199/259
Rexroth Frequency Converter Fv
Accessories
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