Specifications

12
WIRING
Safety stop function
3.4 Safety stop function
Function description
The terminals related to the safety stop function are shown below.
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
shortning wires, and then connect to the safety relay module as shown in the following connection diagram.
At an internal safety circuit failure, the operation panel displays one of the faults shown on the next page.
ÒÑÌÛ
! Use the terminal SO to output a fault and to prevent restarting of the inverter. The signal cannot be used as safety stop input signal to other devices.
Connection diagram
To prevent automatic restart after a fault occurrence, connect the reset button of a safety relay module or a safety programmable controller across the terminals
SO and SOC. The reset button acts as the feedback input for the safety relay module or the safety programmable controller.
Safety stop function operation
At an internal safety circuit failure, the operation panel displays one of the faults shown below.
SA is displayed on the operation panel when both of the S1 and S2 signals are in the open status and no internal safety circuit failure exists.
ON: Transistor used for an open collector output is conducted.
OFF: Transistor used for an open collector output is not conducted.
N/A denotes a condition where circuit fault does not apply.
Terminal
symbol
Terminal function description
S1 For input of the safety stop channel 1. Open between S1 and SIC, and between S2 and SIC:
In safety stop mode.
Short: Other than the safety stop mode.
S2 For input of the safety stop channel 2.
SIC Common terminal for terminals S1 and S2.
SO
Outputs when an alarm or failure is detected.
The signal is output when no internal safety circuit
failure exists.
OFF: Internal safety circuit failure
ON: No internal safety circuit failure
SOCTerminal SO ( open collector output ) common
Input
power
Input signal
Internal safety circuit
failure
Output signal
Inverter operation
enable signal
S1-SIC S2-SIC SO
OFF OFFOutput shutoff (Safe state)
ON
ShortShort
No failureONDrive enabled
FailureOFFOutput shutoff (Safe state)
OpenOpen
No failure ON Output shutoff (Safe state)
FailureOFFOutput shutoff (Safe state)
Short OpenN/A OFF Output shutoff (Safe state)
Open Short N/A OFF Output shutoff (Safe state)
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