Chapter 5 Wire Connection
5-2-3
● Risk of damage to the inverter!
Do not turn on or off the magnetic contactor installed on the input (primary)
and output (secondary) sides of the inverter to start or stop operation.
To start or stop operation using external signals, use the RUN command (FW,
RV) of the control circuit terminal block.
Electric
shock
Injury
Failure
● Risk of electric shock, injury and damage to the inverter!
Do not operate the inverter when an input phase is lost.
With the three-phase input model, even if an input phase is missing, the
internal capacitor will be charged, which may cause an electric shock or
injury. In addition, if an input phase is missing, the inverter may be damaged
due to frequent undervoltage and overcurrent errors due to single-phase
operation.
With a single-phase input model, power will not be supplied due to a single-
wire disconnection. However, contact with the power line on the unbroken
side may cause electric shock or injury.
● Risk of damage to the inverter!
Do not use the following types of power supplies. Otherwise, the internal
converter module may be damaged.
(a) Unbalance of the power supply voltage is 3% or more.
(b) The power supply capacity is 10 times or more than the inverter capacity
and 500 kVA or more.
(c) If a sudden power supply change occurs.
(Example 1) If two or more inverters are installed and connected each
other with a short bus.
(Example 2) If the inverter and the thyristor converter are connected to
each other with a short bus.
(Example 3) If a phase advance capacitor is inserted or shut off.
● Risk of damage to the inverter!
Do not turn on and off the power frequently, which should not be done more
than once every 3 minutes.
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