Safety Stop Function - Mitsubishi Electric 800 Series Hardware Instruction Manual

2.6.8

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
Output terminal used for fault detection and fault indication
display.
So (SO)
The terminal is ON (conducted) while no internal safety circuit
*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 enable the safety stop
function, remove all the shorting wires, and then connect a safety relay module as shown in the connection diagram.
*2 When any fault listed on the next page occurs in the internal safety circuit, the corresponding indication is shown on the operation panel.
NOTE
• Terminal So (SO) can be used to display a fault indication 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.
 Connection diagram
To prevent restart at failure occurrence, connect terminals So (SO) and SOC to the reset button, which are the feedback input
terminals of the safety relay module.
RESET
Emergency
stop button
Safety relay module /
Safety programmable controller
Terminal function description
Status of both the circuit between terminals S1 and SIC and
the circuit between terminals S2 and SIC
Open: Safety stop is activated.
Shorted: Safety stop is not activated
OFF: Internal safety circuit failure
ON: No internal safety circuit failure
So (SO)
Logic
SOC
+24V
Fuse
PC
CPU
24 VDC
S2
S1
SIC
SD
*2
*2
Inverter
R/L1 S/L2 T/L3
Gate
Gate
ASIC
Driver Driver
G G
2. INSTALLATION AND WIRING
1
2
3
4
5
6
7
8
9
10
IGBTs
U V W
M
59
2.6 Control circuit