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Accessories
Description
Mains voltage three-phase at Corner-
grounded-Delta mains
Mains voltage three-phase at IT mains
Tolerance U
(UL)
LN
Input frequency (UL)
Nominal current
Calculation of leakage current
Required wire size according to IEC
60364-5-52; at I
L_cont
Required wire size according to UL 508
A (internal wiring); at I
L_cont
Tab. 15-18: 3P 200 / 3P 380 VAC electric data
15.11 External Brake Resistor
15.11.1 Braking Ratio
Brake resistors with different power ratings are available to dissipate braking en-
ergy when the frequency converter is in generator mode.
The tables below list the optimal combination of frequency converter, brake re-
sistor and the number of components required to operate one frequency con-
verter with respect to a given moderating ratio OT.
OT (On Time percentage) Braking ratio
Tb
Fig. 15-43: Braking ratio
Bosch Rexroth AG R912005854_Edition 09
Symbol
U
LN
U
LN
–
f
LN
I
L_cont
I
leak
A
LN
A
(UL)
LN
Braking time
Rexroth Frequency Converter EFC x610
0120-
0250-
Unit
A-05
N-05
V
V
–
-15...+10 %
Hz
A
120
250
mA
5
14
35
70
mm
2
AWG
1
4 / 0
Tc
Series
0320-
0400-
N-05
N-05
Not allowed
Not allowed
50...60
320
400
14
14
185.0 /
120
95.0*2
350
500
kcmil
kcmil
Engineering cycle
time in application
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