E1 Series Servo Drive User Manual Safety Function
HIWIN MIKROSYSTEM CORP. 12-9
12.4.2 Malfunction detection method of STO safety function
If SF1 or SF2 signal remains ON, EDM signal will not be ON. Therefore, the system will not be reset even
when the guard is closed. The machine cannot be in servo ready state. This could be caused by
malfunction of peripheral device, such as disconnection and short circuit of external wiring or malfunction
of servo drive. Find the cause and perform corrective action.
12.4.3 Operating procedure of STO safety function
Step 1: Operation personnel requests to open the guard.
Step 2: If the motor is operating, input a stop command from the controller.
Step 3: Open the guard.
Step 4: When SF1 and SF2 signals are OFF and the servo drive is in STO state, operation is allowed
inside the guard.
Step 5: Operation completes. Operation personnel leaves the guarded area.
Step 6: Close the guard.
Step 7: Input servo on input (S-ON) signal from the controller.
12.5 Examination of STO safety function
If the servo drive or wiring is changed during maintenance, perform the examination of STO safety
function described as below.
(1) Ensure when SF1 and SF2 signals are OFF and the servo drive is in STO state, the motor is stopped.
(2) Monitor SF1 and SF2 signals. If their states are different from the displays, it could be caused by
malfunction of peripheral device, such as disconnection and short circuit of external wiring or
malfunction of servo drive. Find the cause and perform corrective action.
(3) Ensure EDM signal is OFF when the servo drive is in S-RDY state by feedback circuit input display
of the connected device.
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