36
ServoA
Operation Manual
ID no.: LDS-O-SA-EN-202103
Electrical installation
Method to calculate the continuous braking power:
•
Calculation of effective drive controller
loading in a cycle T:
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
×
=
•
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
×
=
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 ef-
fective braking power of a device cycle
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
×
=
This results in the minimum permissible
cycle time T with calculated continuous
braking 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
×
=
The maximum total on-time of the brak-
ing 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
×
=
ATTENTION!
No additional external braking resistor may be connected to
drive controllers with integrated braking resistor.
!
sense when the effective drive controller load is ≤ 80 % or the braking resistor is de-
signed for one-off emergency stop. In the event of an emergency stop, only the heat
capacity of the braking resistor can be used for a one-off braking action. The permis-
sible energy WIBr can be taken from the following table
Device
Rated resist-
ance
Peak braking
power W
Pluse energy
Ws
K1
SA52.0075
500(PTC)
640
x
x
SA54.0075
7500(PTC)
160
x
x
SA52.0100
500(PTC)
640
x
x
SA52.0150
500(PTC)
640
x
x
SA54.0100
7500(PTC)
160
x
x
SA54.0150
7500(PTC)
160
x
x
SA52.0200
90(Optional)
1600
6000
x
SA54.0200
90(Optional)
6000
6000
x
SA54.0300
90(Optional)
6000
6000
x
SA54.0550
90(Optional)
6000
6000
x
SA54.0750
90(Optional)
6000
6000
x
SA54.0900
90(Optional)
6000
6000
x
Table 3.8 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 tem-
perature will be neglected.
Содержание ServoA SA52.0100
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