Stopping Servomotors After /S_On Turned Off Or Alarm Occurrence - YASKAWA SGMJV User Manual

5.2.5 Stopping Servomotors after /S_ON Turned OFF or Alarm Occurrence

The 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 Pn 001.0 to select the stopping method for the servomotor after the /S_ON signal is OFF.
Parameter
n.
Pn001
n.
n.
Note: Similar to the Coast Mode, the n.
in Dynamic Brake Mode) does not generate any braking force when the servomotor stops or when it rotates 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 with a reference input applied, which may
result in deterioration of the internal elements in the SERVOPACK.
Use speed input references or position references to start and stop the servomotor.
• If the main circuit power supply (L1, L2, and L3) or the control power supply (L1C,
L2C or 24V, 0V depending on the SERVOPACK model) is turned OFF, but the /S_ON
signal is not OFF, the stopping method for servomotor cannot be set by parameters.
Use the following method to stop the servomotor.
If turning OFF the main circuit power supply, but the /S_ON signal is not OFF, the ser-
vomotor will be stopped by dynamic braking.
If turning OFF the control power supply, but the /S_ON signal is not OFF, the stopping
method will vary with the SERVOPACK model. Two stopping methods are available.
• SERVOPACKs stop by coasting
Applicable models: SGDV-330A, 470A, 550A, 590A, 780A, 280D, 370D
• SERVOPACKs stop by dynamic braking
Applicable models: All SERVOPACKs other than those listed for coasting.
• If the servomotor must be stopped by coasting rather than by dynamic braking when
the main circuit power supply or the control power supply is OFF, but the /S_ON sig-
nal is not OFF, arrange the sequence externally so the current will be cut off for wires
U, V, and W.
• To minimize the coasting distance of the motor to come to a stop, 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 stop-
ping method, however, depending on the application.
For example, for multiple axes coupling operation (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.
Mode After
Stop Mode
Stopping
Dynamic
0
Brake
Stop by
dynamic
brake
1 Coast
Coast to a
2 Coast
stop
0 setting (which stops the servomotor by dynamic braking and then holds it
Meaning
Stops the servomotor by
dynamic braking (DB), then
holds it in Dynamic Brake
Mode. [Factory setting]
Stops the servomotor by
dynamic braking (DB), then
places it into Coast Mode.
Stops the servomotor by coast-
ing and continues in Coast
Mode.
5.2 Setting Common Basic Functions
When Enabled Classification
After restart Setup
5
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