9.2 Details of Function Codes
9-43
Chap. 9 FUNCTION CODES
Dynamic torque vector control
To get the maximal torque out of a motor, this control calculates the motor torque matched to
the load applied and uses it to optimize the voltage and current vector output.
Selecting this control automatically enables the auto torque boost and slip compensation
function and disables auto energy saving operation.
This control is effective for improving the system response to external disturbances and the
motor speed control accuracy.
When using the dynamic torque vector control, be sure to match F05 (Rated voltage at base
frequency 1) and F06 (Maximum output voltage 1) with the motor rated values. For the 2nd
motor, set A03 and A04. When F05 = 0 (Factory default), the inverter runs based on 200 V
/400 V.
V/f control for PMSM drive
Under this control, the inverter drives a permanent magnet synchronous motor (PMSM).
Refer to Section 9.3 "Notes in Driving PMSM" for details.
F43 Current Limiter (Mode selection)
F44 Current Limiter (Level)
When the output current of the inverter exceeds the level specified by the current limiter
(F44), the inverter automatically manages its output frequency to prevent a stall and limit the
output current. (Refer to the description of function code H12.)
The current limiter mode should be selected with F43. If F43 = 1, the current limiter is
enabled only during constant speed operation. If F43 = 2, it is enabled during both of
acceleration and constant speed operation. Choose F43 = 1 if you need to run the inverter at
full capability during acceleration and to limit the output current during constant speed
operation.
Mode selection (F43)
F43 selects the motor running state in which the current limiter becomes activated.
Running states that enable the current limiter
Data for F43
During acceleration During constant speed During deceleration
0 Disable Disable Disable
1 Disable Enable Disable
2 Enable Enable Disable
Level (F44)
F44 specifies the operation level at which the output current limiter becomes activated, in
ratio to the inverter rating.
• Since the current limit operation with F43 and F44 is performed by software, it
may cause a delay in control. If you need a quick response, also enable the
instantaneous overcurrent limiting by hardware (H12 = 1).
• If an excessive load is applied when the current limiter operation level is set
extremely low, the inverter will rapidly lower its output frequency. This may
cause an overvoltage trip or dangerous turnover of the motor rotation due to
undershooting.
• For the single-phase 100 V class series, the current limiting level should be
calculated based on the reference current as shown below.
Inverter type FRN_ _ _ _C2S-6U 0001 0002 0003 0005
Nominal applied motor (HP) 1/8 1/4 1/2 1
Reference current (A) 0.8 1.5 3.0 5.0
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