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Design Information
1.15 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 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 (e.g. STF) of the control circuit.
5) Make sure that the specifications and rating match the system requirements.
1) Commercial power supply-inverter
switch-over
R
Power
supply
S
T
Inverter
6) For use in the following application where speed control is performed using a sensor
input-based conveyor program with the signals of sensors
into the STF, STR and RL terminals, respectively, and the built-in PLC function set
for terminal function disable (D9148), the built-in PLC function is not set for terminal
function disable but for STF, STR and RL terminal function enable in the factory
setting status (Pr. 507=0) when the built-in PLC function is in a STOP status or there
is no program, and the inverter operates if any of the sensors is blocked. (Refer to
page 138 for Pr. 507 "inverter operation lock mode setting".)
A
B
Conveyor
MC1
Interlock
U
IM
V
MC2
W
Leakage current
C
A
Start sensor
Deceleration
B
sensor
C
Stop sensor
IM
Motor
Inverter
3) Low-level signal contacts
Low-level
ignal contacts
<Connection diagram>
A
B
C
40
Twin contact
,
and
entered
A
B
C
Inverter
R
U
IM
S
V
T
W
STF
STR
RL
SD
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