Mitsubishi Electric FR-A800 Plus Series Installation Manuallines page 28

WIRING
2.5 Safety stop function
2.5.1 Function description
The terminals related to the safety stop function are shown below.
Terminal symbol Terminal function description
*1
S1
For input of the safety stop
*1
S2
*1
Common terminal for terminals S1 and S2
SIC
Outputs when an alarm or failure is detected.
The signal is output when no internal safety
So (SO)
circuit failure
SOC Terminal So (SO) (open collector output) 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 following connection diagram.
*2
At an internal safety circuit failure, the operation panel displays one of the faults shown on the next page.
CAUTION
Use the 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.
2.5.2 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 (SO) and SOC. The reset button acts as the feedback input for the safety relay module or the
safety programmable controller.
RESET
Emergency stop
button
22
Channel 1
Channel 2
*2
exists.
So (SO)
SOC
+24V
PC
Fuse
24VDC
S2
S1
SIC
SD
Safety relay module/
Safety programmable controller
Between S1 and SIC
Open: In safety stop mode
Short: Other than the safety stop mode
Between S2 and SIC
OFF: Internal safety circuit failure
ON: No internal safety circuit failure
Inverter
Logic
Gate
CPU ASIC
Driver
G
*2
*2
R/L1 S/L2 T/L3
IGBTs
Gate
Driver
G
U V W
M