Usage Precautions; Terminal Wiring; Safety Stop Function (Sto) Related Precautions - Fuji Electric Alpha7 VV User Manual

2.7.2 Usage Precautions

2.7.2.1

Terminal Wiring

 The [EN1+], [EN1-], [EN2+], and [EN2-] terminals are used for safety circuit wiring. When carrying
out terminal wiring, use shielded wire, and wire in such a way as to ensure no shorting between
terminals.
 For terminal input, performing switching with devices such as safety switches or safety relays
certified for safety level of EN ISO13849-1 PL=e Cat.3 or higher to ensure that inputs can be
properly opened.
 The machine manufacturer must take responsibility for ensuring that there is no shorting or other
faults in the wiring of external safety devices connected between the [EN1+] and [EN2+] terminals
and 24 V power supply.
Example:
 Current may continue to flow to the [EN1+] and [EN2+] terminals, hindering the safety function,
even if the [EN1+] or [EN2+] terminal wiring becomes trapped in the control panel doors,
causing a short circuit, and safety components turn OFF.
 Current may continue to flow to the [EN1+] and [EN2+] terminals, hindering the safety function
if the safety circuit wiring comes into contact with other wiring.
2.7.2.2

Safety Stop Function (STO) Related Precautions

 If constructing a product safety system with the safety stop function (STO), the machine
manufacturer is responsible for carrying out a risk assessment not of external devices and wiring
connected to the [EN1+] and [EN2+] terminals, but of the entire machinery including other
equipment, devices, or wiring for product safety systems required by the manufacturer, and for
ensuring that the entire machinery is compatible with the product safety system. Furthermore, a
periodic inspection must be carried out to determine whether the product safety system is
functioning properly for the purpose of preventive maintenance.
 To comply with functional safety, install the servo amplifier inside a control panel offering protective
construction of IP54 or higher.
 To comply with functional safety, it is also necessary to comply with European standards
EN61800-5-1 and EN61800-3.
 The safety stop function (STO) is designed to slowly stop motors (free-run stop).
 Input a test pulse to the [EN1+] and [EN2+] terminals for less than 1 ms when performing a
diagnosis with the safety PLC.
 Turn input terminals OFF for 20 ms or longer to activate the safety stop function (STO) properly.
CHAPTER 2 WIRING
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Safety Function
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