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3. SIGNALS AND WIRING
3 - 32
3.10 Servo motor with an electromagnetic brake
3.10.1 Safety precautions
CAUTION
Configure an electromagnetic brake circuit so that it is activated also by an
external EMG stop switch.
Servo motor
Electromagnetic brake
B
U
RA
Contacts must be opened when ALM (Malfunction
)
or MBR (Electromagnetic brake interlock) turns off.
24 V DC
Contacts must be opened with the
EMG stop switch.
The electromagnetic brake is provided for holding purpose and must not be used
for ordinary braking.
Before performing the operation, 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.
POINT
Refer to the Servo Motor Instruction Manual (Vol. 3) for specifications such as
the power supply capacity and operation delay time of the electromagnetic
brake.
Refer to the Servo Motor Instruction Manual (Vol. 3) or section 11.19 for the
selection of a surge absorber for the electromagnetic brake.
Note the following when the servo motor with an electromagnetic brake is used.
1) The brake will operate when the power (24 V DC) turns off.
2) Turn off the servo-on command after the servo motor stopped.
(1) Connection diagram
B2
B1
Servo motor
24 V DC
ALM
(Malfaunction)
Servo amplifie
r
DICOM
MBR
DOCOM
MBR
RA1
RA1
U B
(Note 1)
(Note 2)
24 V DC
Note 1.
2.
Create the circuit in order to shut off by interlocking with the emergency stop switch.
Do not use the 24 V DC interface power supply for the electromagnetic brake.
(2) Setting
In [Pr. PC02 Electromagnetic brake sequence output], set the time delay (Tb) from electromagnetic
brake operation to base circuit shut-off at a servo off time as in the timing chart in section 3.10.2.
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