Omron RX Series - Page 448

7 Detailed Functions
7 - 122
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
• This function is enabled when the 1st/2nd Control Method (A044/A244) is set to 03 (Sensorless
vector control), 04 (0-Hz sensorless vector control), or 05 (Sensor vector control). It supplies a flow of
excitation current to the selected input terminal to establish the magnetic flux in advance.
• In addition to establishing the magnetic flux in advance, this function improves the torque
responsiveness during startup and therefore is useful for applications such as the elevating axis.
• To allocate this function, set the Multi-function Input S1 to S8 Selection (C001 to C008) to 55 (FOC).
• Once the FOC function is allocated, the inverter does not accept the RUN command unless the
terminal FOC turns ON.
• If the terminal FOC is turned OFF during operation, the inverter will fall in a free-run state. In this
case, turning ON the terminal FOC again causes the inverter to restart according to the Free-run
Stop Selection (b088) setting.
• This function causes the inverter to hold the result of external analog input to the terminal AHD while
it is ON.
• To allocate this function, set the Multi-function Input S1 to S8 Selection (C001 to C008) to 65 (AHD).
• While the terminal AHD is ON, you can use the UP/DWN function using the analog signal held by this
function as a reference value.
• Setting the UP/DWN Storage Selection (C101) to 01 enables the inverter to store the UP/DWN result.
• If the power supply is turned on, or if the terminal RS (C001 to C008 = 18) turns from ON to OFF, with
the terminal AHD ON, the last held data is available.
Preliminary Excitation Function (FOC)
Parameter No. Function name Data Default data Unit
C001 to C008
Multi-function Input S1
to S8 Selection
55: FOC (Preliminary excitation) – –
Related functions A044/A244
Analog Command Hold Function (AHD)
Parameter No. Function name Data Default data Unit
C001 to C008
Multi-function Input S1
to S8 Selection
65: AHD (Analog command held)
––
Related functions C101
FOC
FW (RV)
Output
frequency
Excitation current flows
Free running Restarts according to b088
Does not operate because
the FOC terminal is OFF