Faulty Wiring Diagnostic Function - Omron SYSMAC C500-NC222-E Operation Manual

Faulty Wiring Diagnostic Function

Configuration of Input Circuit
External Interrupt Inputs
Emergency Stop Input
2-3 Faulty Wiring Diagnostic Function
22
+24V
STP
24V
470 W
ORG
DC
EMG
3.4 kW 1/3 W
DC GND
STP, ORG, EMG inputs (X,Y axes)
External interrupt inputs are effective during operation, but their functions
differ for 1) Positioning and searching for the origin and 2) JOG operations.
During positioning or origin searches, setting of positions into the error count-
er is stopped, and the count decreases naturally to cause a deceleration stop
through workpiece momentum. This deceleration differs according to the de-
gree of momentum in the error counter when the external interrupt is turned
ON.
Similarly, during JOG operations the error counter count decreases naturally
to cause a deceleration stop through workpiece momentum. However, during
JOG operations natural deceleration occurs according to the number of
pulses stored in the deceleration-stop parameter (address 418 for the X axis,
818 for the Y axis) whenever the setting of this parameter is larger than the
value in the error counter when the external interrupt is received. In this ca-
pacity an external interrupt can be used to stop the workpiece after an estab-
lished number of pulses.
If the emergency stop input is received while an axis is moving, pulse string
input to the error counter will be stopped, the error counter will be cleared,
positioning will stop immediately, and a servo lock will be set. When an emer-
gency stop is executed, the current position will also be cleared.
To restart operation after an emergency stop has been executed, turn OFF
the emergency stop input, reset the error (ERST), and redefine the origin.
In a semiclosed-loop servo system, faulty wiring may cause the servomotor
to run out of control. The Position Control Unit prevents this by its faulty wir-
ing diagnostic function.
Error
counter
Amp
D/A
(2)
AG
CW
Direction
CCW
circuit
(1) Faulty wiring at phase feedbacks A and B.
(2) Faulty wiring at ground and positive lines of speed voltage output.
Photocoupler
Servomotor
driver
Servomotor
Voltage
(1) Phase A feedback
Phase B feedback
Encoder
Section 2-3