3 SIGNALS AND WIRING
3.9 Servo motor with an electromagnetic brake
119
3
3.9
Servo motor with an electromagnetic brake
Safety precautions
• Refer to "Servo Motor Instruction Manual (Vol. 3)" for specifications such as the power supply capacity and
operation delay time of the electromagnetic brake.
• Refer to "Servo Motor Instruction Manual (Vol. 3)" for the selection of a surge absorber for the
electromagnetic brake.
Note the following when the servo motor with an electromagnetic brake is used.
• The electromagnetic brake will operate when the power (24 V DC) turns off.
• Turn off the servo-on command after the servo motor stopped.
Connection diagram
*1 Create the circuit in order to shut off by interlocking with the emergency stop switch.
*2 Do not use the 24 V DC interface power supply for the electromagnetic brake.
Setting
In [Pr. PC02 Electromagnetic brake sequence output], set a delay time (Tb) from MBR (Electromagnetic brake interlock) off to
base circuit shut-off at a servo-off as in the timing chart in the following section.
CAUTION
• Configure an electromagnetic brake circuit which is interlocked with an external emergency stop switch.
• The electromagnetic brake is provided for holding purpose and must not be used for ordinary braking.
• Before operating the servo motor, be sure to confirm that the electromagnetic brake operates properly.
• Do not use the 24 V DC interface power supply for the electromagnetic brake. Always use the power supply designed exclusively for the electromagnetic
brake. Otherwise, it may cause a malfunction.
• When using EM2 (Forced stop 2), use MBR (Electromagnetic brake interlock) for operating the electromagnetic brake. Operating the electromagnetic brake
without using MBR during deceleration to a stop will saturate servo motor torques at the maximum value due to brake torque of the electromagnetic brake.
This can result in delay of the deceleration to a stop from a set value.
Servo motor
Electromagnetic brake
B
U
RA
Contacts must be opened
with the Emergency stop switch.
Contacts must be opened when ALM
(Malfunction) or MBR (Electromagnetic
brake interlock) turns off.
24 V DC
B2
B1
Servo motor
24 V DC
ALM
(Malfunction)
Servo amplifier
MBR
DOCOM
MBR
RA1
RA1
U
B
*1
24 V DC
*2
Summary of Contents for MELSERVO-J4 series
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