MSD Single-Axis System Operation Manual AC-AC Servo Drive
ID no.: CA65642-001 06/2018
moog
47
Electrical installation
4.16.4 Method to calculate the continuous braking power:
y
Calculation of effective servo drive utilisation in
a cycle T:
dt
i
T
I
T
eff
∫
=
0
2
1
Br
T
PBr
DBr
dt
P
T
P
∫
×
≥
0
1
1
1
K
I
I
P
N
eff
DBr
×
−
=
∫
×
=
T
Br
DBr
PBr
dt
P
P
T
0
T
P
P
T
DBr
PBr
BrSum
×
=
y
Determination of permissible continuous braking
power based on unused drive power:
dt
i
T
I
T
eff
∫
=
0
2
1
Br
T
PBr
DBr
dt
P
T
P
∫
×
≥
0
1
1
1
K
I
I
P
N
eff
DBr
×
−
=
∫
×
=
T
Br
DBr
PBr
dt
P
P
T
0
T
P
P
T
DBr
PBr
BrSum
×
=
Boundary conditions
y
A single braking action must not exceed the
maximum pulse energy of the braking resistor.
W
IBr
≥ P
PBr
x T
Br
y
The continuous braking power calculated for the
device must be greater than the effective braking
power for a device cycle.
dt
i
T
I
T
eff
∫
=
0
2
1
Br
T
PBr
DBr
dt
P
T
P
∫
×
≥
0
1
1
1
K
I
I
P
N
eff
DBr
×
−
=
∫
×
=
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
Br
T
PBr
DBr
dt
P
T
P
∫
×
≥
0
1
1
1
K
I
I
P
N
eff
DBr
×
−
=
∫
×
=
T
Br
DBr
PBr
dt
P
P
T
0
T
P
P
T
DBr
PBr
BrSum
×
=
The maximum total on-time of the braking
resistor over a specified cycle time T with
calculated continuous braking power is:
dt
i
T
I
T
eff
∫
=
0
2
1
Br
T
PBr
DBr
dt
P
T
P
∫
×
≥
0
1
1
1
K
I
I
P
N
eff
DBr
×
−
=
∫
×
=
T
Br
DBr
PBr
dt
P
P
T
0
T
P
P
T
DBr
PBr
BrSum
×
=
4.16.5 Connection of an external braking resistor
NOTE:
Be sure to follow the installation instructions for the external braking resistor.
The temperature sensor (bimetallic switch) on the braking resistor must be
wired in such a way that the power stage is deactivated and the connected
servo drive is disconnected from the mains supply if the braking resistor
overheats.
The minimum permissible connection resistance for the servo drive must not
be infringed, for technical data see chapter A.2.
The braking resistor must be connected using a shielded cable.
R
B
L+
U
V
W
L
1
L
2
L
3
*)
K
1
R
B
K
1
M
1)
2)
*)
Depending on how the temperature sensor is connected, the nature and magnitude of the control voltage, the power required by the mains contactor, it
may be necessary to provide an auxiliary contactor.
1)
Temperature switch, temperature sensor, bimetallic switch
2)
Control voltage
Figure 4.21 Connection of braking resistor
Summary of Contents for G305-170
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Page 6: ...6 MSD Single Axis System Operation Manual AC AC Servo Drive ID no CA65642 001 06 2018 moog...
Page 82: ...82 MSD Single Axis System Operation Manual AC AC Servo Drive ID no CA65642 001 06 2018 moog...
Page 88: ...88 MSD Single Axis System Operation Manual AC AC Servo Drive ID no CA65642 001 06 2018 moog...
Page 89: ...89 MSD Single Axis System Operation Manual AC AC Servo Drive ID no CA65642 001 06 2018 moog...
