Fagor BCSD Series - Page 59

Digital Brushless AC Servo Drive system - Ref. 1809 BCSD-59/116
3. Selecting the Servomotor Stop Method.
This is used to set the stop method when an overtravel (P-OT, N-OT) signal is input while the servomotor
is operating.
• Dynamic brake is an emergency stop function, and one of the general methods to cause a servomotor
sudden stop.
• Dynamic brake suddenly stops a servomotor by shorting its electrical circuit.
• If the servomotor is frequently started and stopped by turning the power ON/OFF or using the servo
ON signal(/S-ON), the DB circuit will also be repeatedly operated, degrading the servodrive’s internal
elements.
• Use the speed input reference and position reference to control the starting and the stopping of the
servomotor.
Parameter Stop Mode
Mode After
Stopping
Meaning
Pn004
H.
 0
Stop by
dynamic brake
Coast
Rapidly stops the servomotor by dynamic braking
(DB), then places it into coast (power OFF) mode.
H. 1 Coast to a stop
Stops the servomotor in the same way as when
the servo is OFF (coast to a stop), then places it
into coast (power OFF) mode.
H.
 2
S-OFF
/Overtravel
Stops the servomotor by dynamic braking (DB)
when servo OFF, stops the servomotor by plug
braking when overtravel, and then places it into
coast (power OFF) mode.
H.
 3
Makes the servomotor coast to a stop state when
servo OFF, stops the servomotor by plug braking
when overtravel, and then places it into coast
(power OFF) mode.
H.
 4
Zero Clamp
Stops the servomotor by dynamic braking (DB)
when servo OFF, stops the servomotor by plug
braking when overtravel, and then places it into
zero clamp mode.
H.
 5
Makes the servomotor coast to a stop state when
servo OFF, stops the servomotor by plug braking
when overtravel, then places it into zero clamp
mode.
- After changing these parameters, turn OFF the main circuit
and control power supplies and then turn them ON again
to enable the new settings.
- Stop by dynamic brake: Stops by using the dynamic brake
(with short-circuiting by a circuit of servodrive).
-Coast to a stop: Stops naturally, with no brake, by using
the friction resistance of the servomotor in operation.
- Plug braking: Stops by using plug braking limit torque.
- Zero Clamp Mode: A mode forms a position loop by using
the position reference zero.