Mitsubishi Electric 800 Series Instruction Manual page 45

Control circuit
2.6.6
Safety stop function
Function description
The terminals related to the safety stop function are shown below.
Terminal
symbol
S1 For input of the safety stop channel 1.

S2 For input of the safety stop channel 2.

SIC Common terminal for terminals S1 and S2.

Outputs when an alarm or failure is detected.
So (SO)
The signal is output when no internal safety circuit failure
SOC Terminal So (SO) (open collector output) common

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.

At an internal safety circuit failure, the operation panel displays one of the faults shown on the next page.
NOTE
• Use the terminal So (SO) to output a fault and to prevent restarting of the inverter. The signal cannot be used as safety stop
input terminal 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 (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
/ Safety programmable controller
44
INSTALLATION AND WIRING
Terminal function description
So (SO)
SOC
Fuse
PC
24 VDC
S2
S1
SIC
SD
Safety relay module
Between S1 and SIC, S2 and SIC
Open: In safety stop mode
Short: Other than the safety stop mode.
OFF: Internal safety circuit failure
exists. ON: No internal safety circuit failure

Inverter
Logic
+24 V
CPU


R/L1 S/L2 T/L3
IGBTs
Gate
Gate
ASIC Driver
Driver
G G
U V W
M