Safety Stop Function - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

NOTE
• Inrush current equal to or higher than the 24 V external power supply specification may flow at power-ON. Confirm that the
power supply and other devices are not affected by the inrush current and the voltage drop caused by it. Depending on the
power supply, the inrush current protection may be activated to disable the power supply. Select the power supply and capacity
carefully.
• When the wiring length between the external power supply and the inverter is long, the voltage often drops. Select the
appropriate wiring size and length to keep the voltage in the rated input voltage range.
• In a serial connection of several inverters, the current increases when it flows through the inverter wiring near the power supply.
The increase of the current causes voltage to drop further. When connecting different inverters to different power supplies, use
the inverters after confirming that the input voltage of each inverter is within the rated input voltage range. Depending on the
power supply, the inrush current protection may be activated to disable the power supply. Select the power supply and capacity
carefully.
• "E.SAF" or "E.P24" may appear when the start-up time of the 24 V power supply is too long (less than 1.5 V/s) in the 24 V
external power supply operation.
• "E.P24" may appear when the 24 V external power supply input voltage is low. Check the external power supply input.
• Do not touch the control circuit terminal block (circuit board) during the 24 V power supply operation (when conducted).
Otherwise you may get an electric shock or burn.
2.6.7

Safety stop function

 Function description
The terminals related to the safety stop function are as follows.
Terminal
symbol
*1
Input terminal as the safety stop channel 1.
S1
*1
Input terminal as the safety stop channel 2.
S2
*1
Common terminal for S1 and S2.
SIC
Outputs when an alarm or failure is detected.
The signal is output when no internal safety circuit
So (SO)
*2
failure exists.
SOC Open collector output (terminal So (SO)) common
*1 In the initial status, terminals S1 and PC, S2 and PC, and SIC and SD are respectively shorted with shorting wires. To use the safety stop function,
remove all the shorting wires, and then connect to the safety relay module as shown in the connection diagram.
*2 An internal safety circuit failure represents that any fault listed on the next page occurs and the corresponding indication is shown on the operation
panel.
NOTE
• Use terminal So (SO) to output a fault and to prevent restarting of the inverter. The signal output from terminal So (SO) cannot
be used to input a safety stop signal to other devices.
80
2. INSTALLATION AND WIRING
2.6 Control circuit
Terminal function description
Between S1 and SIC, and between S2 and SIC
Open: Safety stop function is activated.
Shorted: Safety stop function is not activated.
OFF: Internal safety circuit fault
ON: No internal safety circuit fault
*2
*2