The Commercial Power Supply-Inverter Switch-Over Sequence Function - Mitsubishi FR-A5AR Instruction Manual

5.THE COMMERCIAL POWER SUPPLY-INVERTER SWITCH-OVER SEQUENCE FUNCTION

If the commercial power supply-inverter switch-over sequence function is activated with the FR-A5AR mounted on
the inverter, the phenomenon where magnet contactor switches alternate between ON and OFF may occur.
To prevent this, adapt either connection shown below.
(1) Recommended connection example 1
Use inverter output terminals (Contact sig-
nal, open collector signal) instead of MG1
signals.
The phenomenon occurs when relay out-
put of the FR-A5AR is used as MC1 signal.
(2) Recommended connection example 2
When using relay output of the FR-A5AR,
set the alarm output signal (ABC) instead
of the MC1 signal and output it from con-
tacts B and C.
CAUTION
For the FR-V500 series, the commercial power supply-inverter switch-over sequence function can not be used.
NFB
MC1
R
Supply
S
open collector
T
R1
S1
NFB
MC1
R
Supply
S
T
R1
S1
8
MC2
MC3
Inverter
U
V
W
or
contacts
MC1
MC1
A and C
FR-A5AR
A
MC2
MC2
C
A
MC3
MC3
C
MC2
MC3
Inverter
U
V
W
FR-A5AR
B
MC1
ABC
C
A
MC2
MC2
C
A
MC3
MC3
C
Motor
IM
Motor
IM