Table of Contents
Advertisement
Design information to be checked
1.13 Design information to be checked
1)
When performing commercial power supply-inverter switchover operation for the motor other than the vector
control dedicated motor, securely provide electrical and mechanical interlocks for the MC1 and MC2 used for
commercial power supply-inverter switchover.
When the wiring is wrong or there is a commercial power supply-inverter switchover circuit as shown below, the
inverter will be damaged by a sneak current from the power supply due to arcs generated at the time of
switchover 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 that will not turn 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)
When the power supply used with the control circuit is different from the one used with the main circuit, make
up a circuit which will switch off the main circuit power supply terminals R, S, T when the control circuit power
supply terminals R1, S1 are switched off.
4)
Since the input signals to the control circuit are on a low level, use two parallel low-level signal contacts or a
twin contact for contact inputs to prevent poor contact.
5)
Do not apply a voltage to the contact input terminals (e.g. STF) of the control circuit.
6)
Do not apply a voltage directly to the alarm output terminals (A, B, C). Always apply a voltage to these
terminals via a relay coil, lamp, etc.
7)
Fully make sure that the specifications and rating match the system requirements.
Commercial power supply-inverter switchover
(other than the vector control dedicated motor)
R
Power
supply
S
T
Inverter
MC1
Interlock
U
IM
V
MC2
W
Sneak current
Low-level signal contacts
Low-level signal contacts
40
Twin contact
Advertisement
Table of Contents
Troubleshooting
