Yaskawa Matrix Converter - Manual (Page 47)

Wiring Main Circuit Terminals
2-
13
Installing a Magnetic Contactor
If the power supply for the main circuit gets shut off during a sequence, a magnetic contactor can be used to
stop the MxC.
When a magnetic contactor is installed on the primary side of the main circuit to forcibly stop the MxC,
regenerative braking does not work and the MxC will simply coast freely until it stops.
• The MxC can be started and stopped by opening and closing the magnetic contactor on the primary side.
Frequently opening and closing the magnetic contactor, however, may cause the MxC to malfunction. The
MxC should not be started and stopped more than once every 30 minutes.
• The unit cannot be restarted automatically following an interruption in the power supply when using the
digital operator to control the MxC.
Connecting Input Power Supply to the Terminal Block
An input power supply can be connected to terminals R, S, or T on the terminal block. The phase sequence of
the input power supply is irrelevant to the phase sequence created by the MxC.
Installing a Surge Absorber
Always use a surge absorber or diode for inductive loads near the MxC. Examples of inductive loads include
magnetic contactors, electromagnetic relays, solenoid valves, solenoids, and magnetic brakes.
Installing a Noise Filter on Power Supply Side
Install a noise filter to eliminate noise transmitted between the power line and the MxC.
• Correct Noise Filter Installation
Fig 2.10 Correct Installation of a Power Supply Noise Filter
• Incorrect Noise Filter Installation
Fig 2.11 Incorrect Installation of a Power Supply Noise Filter
IM
MCCB
MCCB
Power
supply
Noise
filter
MxC
Use a noise filter for inverters.
Other
controllers
IM
Power
supply
Other
controllers
Do not use general-purpose noise filters. No general-
purpose noise filter can effectively suppress noise
generated from the MxC.
MCCB
MCCB
MxC
General-
purpose
noise filter
IM
MCCB
MCCB
Power
supply
MxC
Other
controllers General-
purpose
noise filter