8.12 Additional Adjustment Function
8.12.3 Gravity Compensation
8-70
8.12.3
Gravity Compensation
When the Servomotor is used with a vertical axis, gravity compensation prevents the moving
part from falling due to the machine’s own weight when the brake is released.
SERVOPACKs with software version 0022 or higher support gravity compensation.
A timing chart for when the moving part is raised then lowered is provided below.
Refer to the following section for details on brake operation timing.
Required Parameter Settings
The following parameter settings are required to use gravity compensation.
Parameter
Description
When Enabled
Classification
Pn475
n.
0
(default setting)
Disable gravity compensation.
After restart
Setup
n.
1
Enable gravity compensation.
Pn476
Gravity Compensation Torque
Setting Range
Setting Unit
Default Setting
When Enabled
Classification
-1,000 to 1,000
0.1%
0
Immediately
Tuning
Holding brake
When the brake i
s
relea
s
ed, the gravity
compen
s
ation torque prevent
s
the
moving part from moving due to gravity.
Moving part of machine
S
ervomotor
0
0
0
S
ervo ON
Torque reference
Gravity compen
s
ation torque (Pn476)
S
ervo OFF
OFF
Brake
applied.
S
ervo ON
Power
s
upplied.
ON
Brake relea
s
ed.
S
ervo OFF
Power not
s
upplied.
OFF
Brake applied.
Power not
s
upplied.
Motor power
s
tatu
s
/BK (Brake)
s
ignal
Brake contact
s
ection
(lining)
Po
s
ition/
s
peed reference
Motor
s
peed
Speed
Position
Torque