10-1
10. Options
10-1 External Options
Table 10-1-1 External options
Molded case circuit
breaker
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.
DC reactor (DCR) 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%.
(4)To reduce the harmonic current in the input.
The input power factor can be improved to 0.9 to 0.95.
Magnetic contactor
(MC)
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.
Surge absorber Connect to suppress the surge generated when the electromagnetic
contactors, control relays or other exciting coils are opened or closed.
S2-A-0 (for electromagnetic contactors), S1-B-0 (for miniature control relays)
Reactor for radio noise
reduction
Use for noise reduction when electric noise interference is caused to radios
or electronic devices near the inverter.
Frequency setting unit Connect to set the frequency from the control circuit terminals using the
inverter power supply.
between phases =
(Average voltage of three phases [V])
(Max. voltage [V]) - (Min. voltage [V])
×67 [%]
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