External Dynamic Brake - Mitsubishi Electric Melservo-J4 MR-J4-DU*B4-RJ100 Series Instruction Manual

8.3

External dynamic brake

CAUTION
• Use an external dynamic brake for this drive unit. Failure to do so will cause an accident because the servo motor does not stop immediately but coasts at an
alarm occurrence for which the servo motor does not decelerate to stop. Ensure the safety in the entire equipment. For alarms for which the servo motor
does not decelerate to stop, refer to the following.
Page 41 TROUBLESHOOTING
For drive units, EM2 has the same function as EM1 in the torque control mode.
Configure a sequence which switches off the magnetic contactor of the external dynamic brake after (or as
soon as) servo-on command has been turned off at a power failure or a malfunction.
For the braking time taken when the external dynamic brake is operated, refer to the following.
Page 58 Dynamic brake characteristics
The external dynamic brake is rated for a short duration. Do not use it very frequently.
The specifications of the input power supply for external dynamic brake are the same as those of the
converter unit control circuit power supply.
When an alarm, [AL. E6 Servo forced stop warning], or [AL. E7 Controller forced stop warning] occurs, or the
power is turned off, the external dynamic brake will operate. Do not use external dynamic brake to stop in a
normal operation as it is the function to stop in emergency.
For a machine operating at the recommended load to motor inertia ratio or less, the estimated number of
usage times of the external dynamic brake is 1000 times while the machine decelerates from the rated speed
to a stop once in 10 minutes.
Be sure to enable EM1 (Forced stop 1) after servo motor stops when using EM1 frequently in other than
emergency.
Specifications
Model
Rated capacity [kW]
Rated voltage
Frequency
Load to motor inertia ratio
Environment Ambient
temperature
Ambient
humidity
Ambience
Altitude
Vibration resistance
Mass [kg]
DBU-P55K-4-B
55
380 V AC to 480 V AC, power fluctuation ±10% or less
50 Hz/60 Hz, frequency fluctuation ±3% or less
15 times or less
Operation 0  to 55  (non-freezing)
-10  to 65  (non-freezing)
Storage
Operation 5 %RH to 90 %RH (non-condensing)
Storage
Indoors (no direct sunlight), no corrosive gas, inflammable gas, oil mist, dust, or conductive particle
2000 m or less above sea level
2
5.9 m/s or less
25
8 OPTIONS AND PERIPHERAL EQUIPMENT
8.3 External dynamic brake
8
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