Mitsubishi FR-E520-0.1KN

INSTALLATION AND WIRING
30
2.2.7 Design information
1) Provide electrical and mechanical interlocks for MC1 and MC2 which are used for
commercial power supply-inverter switch-over.
When there is a commercial power supply-inverter switch-over circuit as shown
below, the inverter will be damaged by leakage current from the power supply due to
arcs generated at the time of switch-over or chattering caused by a sequence error.
2) If the machine must not be restarted when power is restored after a power failure,
provide a magnetic contactor in the inverter's primary circuit and also make up a
sequence which will not switch on the start signal.
If the start signal (start switch) remains on after a power failure, the inverter will
automatically restart as soon as the power is restored.
3) Since the input signals to the control circuit are on a low level, use two or more
parallel micro signal contacts or a twin contact for contact inputs to prevent a contact
fault.
4) Do not apply a voltage to the contact input terminals of the control circuit.
5) Do not apply a voltage directly to the alarm output signal terminals (A, B, C).
Always apply a voltage to these terminals via a relay coil, lamp, etc.
6) Make sure that the specifications and rating match the system requirements.
1) Commercial power supply-inverter
switch-over
U
V
W
R(L
1
)
S(L
2
)
T(L
3
)
IM
Power
supply
Inverter
Leakage current
MC2
MC1
Interloc
k
3) Low-level signal contacts
Low-level si
g
nal contacts Twin contact