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Verfügbare Sprachen
Verfügbare Sprachen
Servodyn - ASC
Braking Resistor
Braking time DEC
GB
Formulas
K = 0,25 for motors
0,20 for motors
0,15 for motors
0,08 for motors
0,05 for motors
( for standard motors )
On period c.d.f.
GB - 63
The braking time DEC is adjusted on the frequency inverter. If the
selected time is too short the BOSCH ASC automatically switches off
and displays the error message OP or OC. The following formulas
allow an approximate determination of the braking time.
1. Braking time without braking resistor
t
Bmin
Validity range:
(field weakening range)
3. Peak braking power
P
Condition:
J
=
to 1,5 kW
M
J
=
2,2 to
4 kW
L
n
=
5,5 to 11 kW
1
n
=
15 to 45 kW
2
55 to 75 kW
n
=
N
M
=
N
M
=
B
M
=
L
t
=
B
t
=
Bmin
t
=
Z
P
=
B
P
=
R
ON period c.d.f for cycle time t
c.d.f =
(J
+ J
) • (n
- n
)
M
L
1
2
=
9,55 • (K • M
+ M
)
N
L
≤
n
n
1
N
M
• n
B
1
=
B
9,55
≤ P
P
B
R
Moment of intertia of the motor
Moment of intertia of the load
Motor speed before deceleration
Motor speed after deceleration
(Stand still = 0 rpm)
Motor rated speed
Motor rated torque
Braking torque (required)
Load torque
Braking time (required)
Minimum braking time
Cycle time
Peak braking time
Peak power of the braking resistor
- 120 s
Z
t
B
• 100 %
t
Z
f
t
(J
+ J
) • (n
M
L
M
=
B
9,55 • t
Condition:
4. Braking time with braking resistor
(J
+ J
) • (n
M
L
t
* =
Bmin
(
9,55 • K• M
Validity range:
P
• 9,55
R
Condition:
(n
- n
1
2
f ≤ 70 Hz
≤ P
P
B
R
[kgm
2
]
[kgm
2
]
-1
[min
]
[min
-1
]
-1
[min
]
[Nm]
[Nm]
[Nm]
[s]
[s]
[s]
[W]
[W]
ON period c.d.f for cycle time t
t
B
c.d.f =
• 100 %
120 s
t
B
Z
1070066022 - 101
- n
)
1
2
- M
L
B
≤
M
1.5 • M
B
N
≤
f
70 Hz
- n
)
1
2
P
• 9,55
R
)
+ M
+
N
L
(n
- n
)
1
2
≤ n
n
1
N
≤ M
• (1,5 -K)
N
)
> 120 s
Z
t
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