GE C11 Manuale Utente

 

- 87 -

 

There is an optional built-in card for RS485 RTU serial communication. Ask at the distributer for details. 

 

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 specific a-

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]