6 Options
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AC Drive
Model
Applicable
Motor
(kW)
Braking Unit
125% Braking Torque
(10% ED; Max. 10s)
Remarks
Minimum
Braking
Resistance
(Ω)
Model QTY
Braking Resistor
Specications
QTY
MD880-01S-
0849-4-(L)
400
MDBU-
200-B
3 26000 W 3.4 Ω 3
Input voltage ≤
440 V AC
2.5 × 3
400
MDBU-
200-C
3 26000W 4.3 Ω 3
Input voltage >
440 V AC
3.0 × 3
◆
The minimum braking resistance in the preceding table supports the operating
condition with ED of 10% and the longest time for single braking of 10s.
◆
The default initial braking voltage for built-in braking units is 700 V. For external
braking units MDBUN-60-T, MDBUN-90-T, and MDBU-200-B, the default initial
braking voltage is 670 V when the input voltage is lower than or equal to 440 VAC.
For external braking units MDBUN-60-5T, MDBUN-90-5T, and MDBU-200-C, the
default initial braking voltage is 760 V when the input voltage is higher than 440
VAC. The resistance of the braking resistor can be adjusted with the initial braking
voltage.
◆
The data in the preceding table is for reference only. You can select the resistance
and power of the braking resistor as required. Note that the resistance cannot
be lower than the recommended minimum value, but the power can exceed
the recommended value. Selection of the braking resistor model is determined
by the generation power of motors and is also related to the system inertia,
deceleration time, and potential energy load. For systems with high inertia, and/
or short deceleration time, and/or frequent braking, select a braking resistor with
higher power and lower resistance.
6.3.4 Overall Dimensions and Mounting Dimensions of Braking Unit
■
Overall dimensions of the MDBUN series braking unit (unit: mm)
ď
Figure 6-1 Overall dimensions of the MDBUN series braking unit (unit: mm)
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