
35
V01 05/2016 1003370
Device
Resistance [Ohm]
Peak performance [W]
braking chopper switch-on
threshold [VDC]
YukonDrive®-1021-xxx
550
400
390
YukonDrive®-1022-xxx
7500
200
650
1)
1)
based on 3 x 400 V mains voltage
Table 35.1 Data of the integrated braking resistor
If the drive is not permanently operated at its power limit, the saved power dissipation of the drive can be used
as braking power.
Note:
Further calculation assumes that the drive controller is used at maximum permissible ambient temperature. This
means that any additional energy input from the internal braking resistor caused by low ambient temperature will
be neglected.
Method to calculate the continuous braking power:
Calculation of effective drive controller loading
in a cycle T:
Determination of permissible continuous
braking power based on unused drive power:
dt
i
T
I
T
eff
∫
=
0
2
1
1
1
K
I
I
P
N
eff
DBr
×
−
=
Br
T
PBr
DBr
dt
P
T
P
∫
×
≥
0
1
∫
×
=
T
Br
DBr
PBr
dt
P
P
T
0
T
P
P
T
DBr
PBr
BrSum
×
=
dt
i
T
I
T
eff
∫
=
0
2
1
1
1
K
I
I
P
N
eff
DBr
×
−
=
Br
T
PBr
DBr
dt
P
T
P
∫
×
≥
0
1
∫
×
=
T
Br
DBr
PBr
dt
P
P
T
0
T
P
P
T
DBr
PBr
BrSum
×
=
Marginal conditions:
A single braking action must not exceed the
maximum pulse energy of the braking resistor.
W
IBr
≥ P
PBr
x T
Br
The continuous braking power calculated for
the device must be greater than the effective
braking power of a device cycle.
This results in the minimum permissible cycle
time T with calculated continuous braking
power:
The maximum total on-time of the braking
resistor over a specified cycle time T with
calculated continuous braking power
results as:
dt
i
T
I
T
eff
∫
=
0
2
1
1
1
K
I
I
P
N
eff
DBr
×
−
=
Br
T
PBr
DBr
dt
P
T
P
∫
×
≥
0
1
∫
×
=
T
Br
DBr
PBr
dt
P
P
T
0
T
P
P
T
DBr
PBr
BrSum
×
=
dt
i
T
I
T
eff
∫
=
0
2
1
1
1
K
I
I
P
N
eff
DBr
×
−
=
Br
T
PBr
DBr
dt
P
T
P
∫
×
≥
0
1
∫
×
=
T
Br
DBr
PBr
dt
P
P
T
0
T
P
P
T
DBr
PBr
BrSum
×
=
dt
i
T
I
T
eff
∫
=
0
2
1
1
1
K
I
I
P
N
eff
DBr
×
−
=
Br
T
PBr
DBr
dt
P
T
P
∫
×
≥
0
1
∫
×
=
T
Br
DBr
PBr
dt
P
P
T
0
T
P
P
T
DBr
PBr
BrSum
×
=