Yaskawa SGDB - Manual (Page 120)

APPLICATIONS OF Σ-SERIES PRODUCTS
3.4.4 Using Holding Brake
108
J Settings
Set in the following parameter the motor speed level at which zero-clamp is to be per-
formed:
Cn-29
ZCLVL
Zero-Clamp Level
Unit:
min −1
Setting Range:
0 to 10000
Factory
Setting:
10
For Speed Control
Only
If zero-clamp speed control is selected, set the motor speed level at which zero-clamp is
to be performed. If a value higher than the maximum motor speed is set, the maximum
speed value is used.
Conditions for Zero-clamp
Zero-clamp is performed when all the following conditions are met:
• Zero-clamp speed control is selected (Parameter Cn-2B=10).
• /P-CON (1CN-41) is turned ON (0 V).
• Motor speed drops below the preset value.
Speed
V-REF speed reference
Preset value for
zero-clamp
/P-CON input
Zero-clamp being
performed
Open (OFF)
Closed (ON)
Time
3.4.4 Using Holding Brake
Holding brake is useful when a servo drive is used
to control a vertical axis. A servomotor with brake
prevents the movable part from dropping due to
gravitation when the system power is turned OFF.
3
Servomotor
Holding brake
Prevents movable
part from shifting
due to gravitation
when power is
turned OFF