Specifications - Fuji Electric ALPHA7 User Manual

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 Employ double [EN1+] and [EN2+] inputs (with redundancy circuit) to ensure that the safety stop

function (STO) is not lost due to a single fault.

If a single fault is detected by the safety cutoff circuit, an alarm is output to external devices, and

the servo amplifier slowly stops the motor (free-run stop), even if the [EN1+] and [EN2+] status is

ON. (The alarm output function does not guarantee that an alarm will be output for all single faults,

however, compatibility with EN ISO13849-1 PL=e Cat. 3 is possible.)

 The safety stop function (STO) is not designed to completely cut off the power supply and motor

electrically. Cut off the servo amplifier input power supply completely, and begin wiring and

maintenance work after 5 minutes or longer have elapsed.

 A motor rotation equivalent to electrical angle of 180° may occur following a servo amplifier fault.

Employ designs that present no danger based on load conditions.

2.6.2.3 Safety Stop (STO) Test

Conduct a check once a day to ensure that the safety stop function (STO) is functioning normally.

2.6.3 Specifications

2.6.3.1 Function Block Diagram

Servo amplifier

Fig. 2.6.3-1 Function block diagram

CHAPTER 2 WIRING

Drive circuit

Safety Function