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10 Options
10-1 Built-in Options
There is an optional built-in card for RS485 RTU serial communication. Ask at the distributer for details.
10-2 External Options
Table 10-2-1 External Options
Molded case circuit
breaker
The molded case circuit breaker (MCCB) is connected for protecting the main
circuit wiring to the drive and for turning power on and off. The rated current or
the rated interrupting capacity varies according to the power supply specifica-
tions.
For input power-factor
correcting
AC reactor (ACR)
DC reactor (DCR)
This is connected in the following cases.
When the power transformer capacity is more than 500 kVA.
When the imbalance ratio between phases of source voltage exceeds 2% (The
value is equivalent to our conventional allowable value.)
Imbalance ratio between phases = ——————————————————— x 67 [%]
To reduce input harmonic current
The input power factor is improved to 0.75 to 0.85 (ACR).
The input power factor is improved to 0.9 to 0.95 (DCR).
If there is a thyristor load in the same power supply, if the capacitor for power-
factor correcting is turned on or off, or if the surge voltage in the power supply is
large (ACR only)
* The AC reactor is unnecessary when the DC reactor is used.
Magnetic contactor
(MC)
The drive can be operated without connecting the magnetic contactor. When the
drive protective function is activated, this should be connected to turn off the
power for safety.
Surge absorber This is connected to suppress the surge generated by the exciting coil when
switching on or off the magnetic contactor and the control relay.
Reactor for radio noise
suppression
This is used for noise suppression when the drive causes excessive noise in a ra-
dio or electronic equipment around the drive.
Frequency setting POT
(VR)
This is connected when the frequency is set from the control circuit terminal us-
ing drive power.
Maximum voltage [V] - Minimum voltage [V]
Average voltage among three phases [V]