Operating Sequences - Fuji Electric Alpha7 VV User Manual

2.7.3.2

Operating Sequences

The signal ON/OFF definition given in the safety function description refers to the following statuses.
ON: The safety switch is closed, and current is flowing to the signal line.
OFF: The safety switch is open, and current is not flowing to the signal line.
(1) Servo amplifier output status if safety stop function (STO) activated
The servo amplifier will be in the safety stop (STO) condition if [EN1+] and [EN2+] are turned OFF.
Fig. 2.7.3-2 shows the servo amplifier output status if [EN1+] and [EN2+] are turned OFF while
the servo amplifier is stopped. Preparation for servo amplifier operation will be complete when
[EN1+] and [EN2+] input turn ON.
OFF
Servo ON
EN1+/EN2+
OFF
input terminals
Servo amplifier
Safety stop (STO)
status
Fig. 2.7.3-2 Servo amplifier output status if safety stop (STO) occurs while servo amplifier stopped
Fig. 2.7.3-3 shows the timing chart when the EMERGENCY STOP button is pushed during servo
amplifier operation. Input to [EN1+] and [EN2+] turns OFF, the servo amplifier is in the safety stop
(STO) condition, and the motor comes to a slow stop (free-run stop).
Servo ON
EN1+/EN2+
ON
input terminals
Servo amplifier
Running
status
Fig. 2.7.3-3 Servo amplifier output status if safety stop (STO) occurs during servo amplifier operation
ON
ON
Awaiting
Running
operation
command
ON
OFF
Safety stop (STO)
CHAPTER 2 WIRING
OFF
OFF
Awaiting
operation Safety stop (STO)
command
OFF
2-113
Safety Function
2