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Page 9.1 - 4
COMBIVERT F5-A, -E, -H
© KEB, 2012-10
General design
9.1.2
Design of braking resistors
The
KEB COMBIVERT fitted with an external braking resistor or an external braking option is suitable for a
limited 4-quadrant operation. The braking energy, refeed into the DC-bus at generatoric operation, is dissipated
over the braking transistor to the braking resistor.
The braking resistor heats up during the braking process. If it is installed in a control cabinet sufficient cooling
of the control cabinet interior and sufficient distance to the KEB COMBIVERT must be observed.
Different braking resistors are available for the KEB COMBIVERT. Please refer to the next page for the corre-
sponding formula and restrictions (valid range).
1. Preset desired braking time.
2. Calculate braking time without braking resistor (t
Bmin
).
3. If the desired braking time shall be smaller than the calculated time, it is necessary to use a braking resistor.
(t
B
< t
Bmin
)
4. Calculate braking torque (M
B
). Take the load torque into account at the calculation.
5. Calculate peak braking power (P
B
). The peak braking power must always be calculated for the worst case
(n
max
to standstill).
6. Selection of braking resistor:
a) P
R
> P
B
b) P
N
is to be selected according to the cycle time(ED).
The braking resistors may be used only for the listed unit sizes. The maximum cyclic duration of a braking re-
sistor shall not be exceeded.
6 % ED =
maximum braking time 8 s
25 % ED =
maximum braking time 30 s
40 % ED =
maximum braking time 48 s
For a longer cyclic duration time special designed braking resistors are necessary. The continuous output of the
braking transistor must be taken into consideration.
7. Check, whether the desired braking time is attained with the braking resistor (t
Bmin
).
Restriction:
Under consideration of the rating of the braking resistor and the brake power of the motor, the braking torque
may not exceed 1.5times of the rating torque of the motor (see formula).
When utilizing the maximum possible braking torque the frequency inverter must be dimensioned for the higher
current.
Braking time DEC
The braking time
DEC
is adjusted at the frequency inverter. If it is chosen too small the KEB COMBIVERT
switches off automatically and the error message
OP
or
OC
appears. The approximate braking time can be
determined according to following formula.
Содержание COMBIVERT F5-A
Страница 1: ...KEB COMBIVERT F5 A E H 4 4 APPLICATION MANUAL Mat No Rev 00F5AEA K440 1A...
Страница 2: ...Page 1 1 2 COMBIVERT F5 A E H KEB 2008 02 Table of contents...
Страница 4: ...Page 1 1 4 COMBIVERT F5 A E H KEB 2008 02 Table of contents...
Страница 14: ...Page 1 1 14 COMBIVERT F5 A E H KEB 2008 02 Table of contents...
Страница 20: ...Page 2 1 6 COMBIVERT F5 A E H KEB 2012 10 Product Overview...
Страница 28: ...Page 3 1 8 COMBIVERT F5 A E H KEB 2012 10 Control Units...
Страница 34: ...Page 4 1 6 COMBIVERT F5 A E H KEB 2012 10 Fundamentals...
Страница 40: ...Page 4 2 6 COMBIVERT F5 A E H KEB 2012 10 Password input...
Страница 42: ...Page 5 1 2 COMBIVERT F5 A E H KEB 2012 10 Selection of Operating Mode...
Страница 46: ...Page 5 1 6 COMBIVERT F5 A E H KEB 2012 10 Selection of Operating Mode...
Страница 70: ...Page 6 2 20 COMBIVERT F5 A E H KEB 2012 10 Start up...
Страница 140: ...Page 7 3 44 COMBIVERT F5 A E H KEB 2012 10 Digital in and outputs...
Страница 200: ...Page 7 5 38 COMBIVERT F5 A E H KEB 2012 10 Motor data and controller adjustments of the asynchronous motor...
Страница 207: ...Motor data and controller adjustments of the synchronous motor KEB 2012 10 COMBIVERT F5 A E H Page 7 6 7 7...
Страница 238: ...Page 7 7 12 COMBIVERT F5 A E H KEB 2012 10 Speed control...
Страница 254: ...Page 7 8 16 COMBIVERT F5 A E H KEB 2012 10 Torque display and limiting...
Страница 260: ...Page 7 9 6 COMBIVERT F5 A E H KEB 2012 10 Torque control...
Страница 292: ...Page 7 11 26 COMBIVERT F5 A E H KEB 2012 10 Speed measurement...
Страница 432: ...Page 7 14 14 COMBIVERT F5 A E H KEB 2012 10 Parameter sets...
Страница 466: ...Page 7 15 34 COMBIVERT F5 A E H KEB 2012 10 Special functions...
Страница 478: ...Page 7 16 12 COMBIVERT F5 A E H KEB 2012 10 CP Parameter definition...
Страница 480: ...Page 8 1 2 COMBIVERT F5 A E H KEB 2012 10 Troubleshooting 8 1 1 General 8 1 3 8 1 2 Error Messages and their Cause 8 1 3...
Страница 488: ...Page 8 1 10 COMBIVERT F5 A E H KEB 2012 10 Troubleshooting...
Страница 496: ...Page 9 1 8 COMBIVERT F5 A E H KEB 2012 10 General design...
Страница 538: ...Page 11 1 28 COMBIVERT F5 A E H KEB 2012 10 Parameter...
Страница 540: ...Page 12 1 2 COMBIVERT F5 A E H KEB 2008 02 Annex 12 1 1 Index 12 1 3...