4.3 Basic Functions Settings
4-13
4
Op
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4.3.4
Holding Brakes
A holding brake is a brake that is used to hold the position of the movable part of the machine when the power
supplies to the multi-winding drive unit, SERVOPACKs, and converters are turned OFF so that the movable
part does not move due to gravity or external forces. Holding brakes are built into servomotors with brakes.
The holding brake is used in the following cases.
There is a delay in the braking operation. Set the following ON/OFF timing.
∗1.
The operation delay time of the brake is shown in the following table. The operation delay time is an example when
the power supply is turned ON and OFF on the DC side. Be sure to evaluate the above times on the actual equipment
before using the application.
∗2.
After the SV_ON command has been sent and 50 ms has passed since the brake was released, output the reference
from the host controller to the multi-winding drive unit.
∗3.
Use Pn506, Pn507, and Pn508 to set the timing of when the brake will be activated and when the servomotor power
will be turned OFF.
Pn806
Reverse Software Limit
Classification
Setting Range
Setting Unit
Factory Setting
When Enabled
-1073741823 to
1073741823
1 Reference Unit
-1073741823
Immediately
Setup
Position
• The brake built into the servomotor with brakes is a de-energization brake, which is
used only to hold and cannot be used for braking. Use the holding brake only to hold
a stopped servomotor.
Main Circuit Power
Supply Voltage
Servomotor
Model: SGMVV- Rated Speed
Voltage
Brake Open Time
Brake Operation
Time
Three-phase
400 VAC
7ED
B
1500 min
-1
24 VDC or
90 VDC
500 ms max.
150 ms max.
Servomotor
Vertical Shaft
Holding brake
Shaft with External Force Applied
Movable part of machine
Holding brake
Movable part of
machine
Servomotor
External
force
Prevents the movable part (table)
from moving due to external force.
Prevents the
movable part from
moving due to its
own weight when the
power is OFF.
Rotation
OFF
OFF
OFF
OFF
ON
ON
*
1
*
2
0
*1
*
3
SV_ON
SV_OFF
Servo ON (SV_ON) command or
Servo OFF (SV_OFF) command
Servomotor power
Brake signal (/BK)
Brake contact part
(lining)
Position reference/
Speed reference
Motor speed
Brake release
Brake applied
Brake applied