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3. Example of safety system configuration
Example 1
Fig.3 Safety system example 1 – STOP asynchronous with EM and fault detection through A-C output.
For safety stop, configure the wiring as shown in Fig.3 above.
Note: the above wiring is configured to prevent restart in case of a fault.
The parameter No.192 must be set to ‘199’. This setting makes the A-C output to open in case of failure.
After the power-up, to reset the safety stop mode, press the START switch, and also press the STF switch,
then start the motor rotation.
In the above configuration, after reset of EM switch, drive will be in safe-state until START switch is
pressed.
ATTENTION
To prevent restart in case of recovering from input power loss of drive, 3-wired connection for STF/STOP
control is recommended.
In case of 2-wire connection and using latching type switch to short between STF and SD/PC for starting,
ensure the compliance with safety requirement for the restarting when the drive recover from input power
loss.
S2
S1
SC
FR-D700
START
+24V
EM
QS90SR2SN-Q
K1
A
CPU
X0 X1
COM0 COM1
24G
Safety
Logic
Circuit
XS0 XS1 Z10 Z00 Z20
Z11 Z01 Z21
K2
DC24V
RY
B
C
RST
UVW
MITSUBISHI MELSEC Safety relay unit
Gate
Driver
Gate
Driver
IGBTs
IM
STF
PC
SOURCE
STOP
STOP
STF