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5 Operation
5.2.6 Stopping Servomotors after /S-ON Turned OFF or Alarm Occurrence
5-14
5.2.6 Stopping Servomotors after /S-ON Turned OFF or Alarm Occurrence
The servomotor stopping method can be selected after the /S-ON (Servo ON) signal turns OFF or an alarm
occurs.
(1) Stopping Method for Servomotor after /S-ON Signal is Turned OFF
Use Pn001.0 to select the stopping method for the servomotor after the /S-ON signal is OFF.
Note: Similar to the Coast Mode, the n.0 setting (which stops the servomotor by dynamic braking and then holds it
in Dynamic Brake Mode) does not generate any braking force when the servomotor stops or when it moves at very
low speed.
• Dynamic braking (DB) is used for emergency
stops. The DB circuit will operate fre-
quently if the power is turned ON and OFF or
the /S-ON signal is ON and OFF with a
reference input applied to start and stop the servomotor, which may result in deterio-
ration of the internal elements in the SERVOPACK.
Use speed input references or positio
n references to start and stop the servomotor.
• If the main circuit power supply or the control power supply is turned OFF but the
/S-ON signal is not OFF, the stopping method for servomotor cannot be set in the
parameters. Use the following method to stop the servomotor.
If turning OFF the main circuit power supply, but th
e /S-ON signal is not OFF, the ser-
vomotor will be stopped by dynamic braking.
If turning OFF the control power supply, but th
e /S-ON signal is not OFF, the stopping
method will vary with the SERVOPACK model. Two stopping methods are available.
• SERVOPACK models for servomotors that stop by coasting:
SGDV-330A and -550A
• SERVOPACK models for servomotors that stops by dynamic braking:
All SERVOPACKs other than those listed for coasting.
• If the servomotor must be stopped by coa
sting rather than by dynamic braking when
the main circuit power supply or the control power supply is turned OFF but the
/S-ON signal is not OFF, arrange the sequence e
xternally so the current will be cut off
for servomotor wires U, V, and W.
• To minimize the coasting distance of the servomotor to come to a stop when an alarm
occurs, the zero-speed stopping method is factory-set for alarms to which the zero-
speed stop method is applicable. The DB stopping method may be more suitable than
the zero-speed stopping method, however, depending on the application.
For example, for multiple axes coupling operatio
n (a twin-drive operation), machinery
damage may result if a zero-speed stop alarm occurs for one of the coupled shafts
and the other shaft stops by dynamic brake. In such cases, change the method to the
DB stopping method.
Parameter Stop Mode Mode After Stopping When Enabled Classification
Pn001
n.
0
[Factory setting]
DB
DB
After restart Setup
n.
1 Coast
n.
2 Coast Coast
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