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* When connecting multiple inverters, use a diode on the each safety input terminal to prevent a malfunction due to
undesirable current.
Fig.4 Example of multiple inverters connected to a safety relay unit
The number of inverters connected to a safety relay unit should be decided under considerations of output
terminal rating of a safety relay unit.
START
EM
+24V
K1
X0 X1
COM0 COM1
24G
Safety
Logic
Circuit
XS0 XS1 Z10 Z00 Z20
Z11 Z01 Z21
K2
DC24V
QS90SR2SN-Q
MITSUBISHI MELSEC Safety relay unit
S2
S1
SC
FR-D700
A
CPU
RY
B
C
RT
U V W
Gate
Driver
Gate
Driver
IGBTs
IM
STF
PC
SOURCE
STOP
STOP
STF
S2
S1
SC
FR-D700
A
CPU
RY
B
C
Gate
Driver
Gate
Driver
IGBTs
IM
STF
PC
SOURCE
STOP
S
RTS
U V W
STOP
STF
*
*
*
*