sh030051g.pdf - 第102页
3 - 47 3. SIGNALS AND WI RING 3.11.2 Timing charts (1) Servo-on command (from controller) ON/OFF Tb [ms] after the servo-on is switched off, the servo lock is released and the servo motor coasts. If the electromagnetic b…
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3. SIGNALS AND WIRING
3.11 Servo motor with an electromagnetic brake
3.11.1 Safety precautions
CAUTION
Configure the electromagnetic brake circuit so that it is activated not only by the
interface unit signals but also by a forced stop (EM1).
EM1RA
24VDC
Contacts must be open when
servo-off, when an alarm occurrence
and when an electromagnetic brake
interlock (MBR).
Electromagnetic brake
Servo motor
Circuit must be
opened during
forced stop (EM1).
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.
POINT
Refer to the Servo Motor Instruction Manual (Vol.2) for specifications such as
the power supply capacity and operation delay time of the electromagnetic
brake.
Note the following when the servo motor with an electromagnetic brake is used.
1) Do not share the 24VDC interface power supply between the interface and electromagnetic brake.
Always use the power supply designed exclusively for the electromagnetic brake.
2) The brake will operate when the power (24VDC) switches off.
3) Switch off the servo-on command after the servo motor has stopped.
(1) Connection diagram
Servo amplifier
Servo motor
B1
B2
Forced
stop
24VDC
Electromagnetic
brake
Trouble
(ALM)
DICOM
MBR RA1
DOCOM
24VDC
(2) Setting
In parameter No.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
3.11.2.
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3. SIGNALS AND WIRING
3.11.2 Timing charts
(1) Servo-on command (from controller) ON/OFF
Tb [ms] after the servo-on is switched off, the servo lock is released and the servo motor coasts. If the
electromagnetic brake is made valid in the servo lock status, the brake life may be shorter. Therefore, when
using the electromagnetic brake in a vertical lift application or the like, set delay time (Tb) to about the same
as the electromagnetic brake operation delay time to prevent a drop.
(95ms)
(95ms)
Electromagnetic
brake interlock
(MBR)
(Note 1) ON
OFF
ON
OFF
0 r/min
Base circuit
Servo motor speed
Servo-on command
(from controller)
ON
OFF
Coasting
Tb
Electromagnetic
brake operation
delay time
Release
Activate
Operation command
(from controller)
Electromagnetic
brake
Release delay time and external relay (Note 2)
(Note 3)
0 r/min
Note 1. ON: Electromagnetic brake is not activated.
OFF: Electromagnetic brake is activated.
2. Electromagnetic brake is released after delaying for the release delay time of electromagnetic brake and operation time of
external circuit relay. For the release delay time of electromagnetic brake, refer to the Servo Motor Instruction Manual (Vol.2).
3. Give the operation command from the controller after the electromagnetic brake is released.
(2) Forced stop command (from controller) or forced stop (EM1) ON/OFF
Servo motor speed
Electromagnetic
brake interlock (MBR)
Base circuit
Forced stop command
(from controller)
or
Forced stop (EM1)
(10ms)
(210ms)
(210ms)
Dynamic brake
Dynamic brake
Electromagnetic brake
Electromagnetic brake
Electromagnetic brake
operation delay time
Electromagnetic brake release
ON
OFF
ON
OFF
Invalid (ON)
Valid (OFF)
(Note)
Note. ON: Electromagnetic brake is not activated.
OFF: Electromagnetic brake is activated.
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3. SIGNALS AND WIRING
(3) Alarm occurrence
Servo motor speed
Base circuit
Electromagnetic
brake interlock (MBR)
Alarm
Dynamic brake
Dynamic brake
Electromagnetic brake
Electromagnetic brake
operation delay time
Electromagnetic brake
(10ms)
ON
OFF
ON
OFF
No
Yes
(Note)
(ON)
(OFF)
Note. ON: Electromagnetic brake is not activated.
OFF: Electromagnetic brake is activated.
(4) Both main and control circuit power supplies off
(10ms)
Dynamic brake
Dynamic brake
Electromagnetic brake
Electromagnetic brake
(Note 1)
15 to 100ms
Electromagnetic brake
operation delay time
(Note2)
Electromagnetic
brake interlock (MBR)
Base circuit
Servo motor speed
Alarm
Main circuit
Control circuit
power
10ms
ON
OFF
ON
OFF
No
Yes
(Note 2)
ON
OFF
(ON)
(OFF)
Note 1. Changes with the operating status.
2. ON: Electromagnetic brake is not activated.
OFF: Electromagnetic brake is activated.