Options; External Options - IMO VXSM75-1 Instruction Manual

10. Options

10-1 External Options

Molded case
circuit breaker
DC reactor (DCR)
Magnetic contactor
(MC)
Surge absorber
Reactor for radio
noise reduction
Frequency setting
potentiometer
Table 10-1-1 External options
Options
The molded case circuit breaker (MCCB) is connected for the protection of
the main circuit wiring up to the inverter and for turning the power on and off.
The rated current or the rated interrupting capacity varies according to the
power supply specifications.
Connect in the following cases.
(1) When the power supply transformer capacity exceeds 500 kVA.
(2) When a thyristor load is connected to the same power supply or when the
capacitor for power factor improvement is turned on or off.
(3) When the unbalance rate between phases of the source
voltage exceeds 2%.
Unbalance rate
between phases =
(4) To reduce the harmonic current in the input.
The input power factor can be improved to 0.9 to 0.95.
The inverter can be operated without an electromagnetic contactor. Connect
one to turn the power off for the safety after the protective function of the
inverter is activated.
Connect to suppress the surge generated when the electromagnetic
contactors, control relays or other exciting coils are opened or closed.
Use for noise reduction when electric noise interference is caused to radios
or electronic devices near the inverter.
Connect to set the frequency from the control circuit terminals using the
inverter power supply.
(Max. voltage [V] - (Min. voltage [V]
(Average voltage of three phases [V]
x 67[%]
10-1