YASKAWA Sigma-7 SGD7S Series

n To minimize the coasting distance of the Servomotor to come to a stop when an alarm
occurs, zero-speed stopping is the default method for alarms to which it is applicable.
However, depending on the application, stopping with the dynamic brake may be
more suitable than zero-speed stopping.
For example, when coupling two shafts (twin-drive operation), machine damage may
occur if a zero-speed stopping alarm occurs for one of the coupled shafts and the
other shaft stops with a dynamic brake. In such cases, change the stopping method
to the dynamic brake.
6.13.2 Stopping Method for Servo OFF
Set the stopping method for when the servo is turned OFF in Pn001 = n.X (Motor
Stopping Method for Servo OFF and Group 1 Alarms).
Parameter Servomotor Stop-
ping Method
Status after
Servomotor
Stops
When Ena-
bled
Classifica-
tion
Pn001
n.0
(default
setting)
Dynamic brake * Dynamic
brake *
After restart Setup
n.1
Coasting
n.2
Coasting Coasting
* The Servomotor will coast to a stop when the SERVOPACK is not equipped with a built-
in Dynamic Brake Resistor or an External Dynamic Brake Resistor is not connected.
If Pn001 is set to n.  0 (Stop the motor by applying the dynamic
brake) and the Servomotor is stopped or operates at a low speed,
braking force may not be generated, just like it is not generated for
coasting to a stop.
6.13.3 Servomotor Stopping Method for Alarms
There are three types of alarms, group 1 (Gr. 1) alarms, group 2 (Gr. 2) alarms and
"PROFINET module" alarms. A different parameter is used to set the stopping method for
alarms for each alarm type.
Refer to the following section to see which alarms are in group 1 and which are in group
2.
Ä Chap. 16.4.2 ‘List of Alarms’ page 586
When a group 1 alarm occurs, the Servomotor will stop according to the setting of Pn001
= n.X. The default setting is to stop by applying the dynamic brake.
Refer to the following section for details.
Ä Chap. 6.13.2 ‘Stopping Method for Servo OFF’ page 174
When a group 2 alarm occurs, the Servomotor will stop according to the settings of the
following three parameters. The default setting is for zero clamping.
Motor Stopping Method
for Group 1 Alarms
Motor Stopping Method
for Group 2 Alarms
Sigma-7 Series SERVOPACKs
Basic Functions That Require Setting before Operation
Motor Stopping Methods for Servo OFF and Alarms > Servomotor Stopping Method for Alarms
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