Omron 3G3RX Series, User Manual

Page: 229 / 442

4-120
4-3 Functions When Option PG Board (3G3AX-PG01) Is Used
4
Functions
Sensor Vector Control (Speed Control)
To use this function, set V/f characteristics selection A044 to "05" (V2), and V2 control mode selec-
tion P012 to "00" (speed control).
("Sensor vector control" can be selected for 1st control only.)
To use this function, make sure that the motor parameter settings are suitable for your motor. Refer
to Inverter model 3G3RX user's manual "Chapter 4 Functions, 4-2 Function Mode, Motor Parameter
Selection".
Also, be sure to set the number of your encoder pulses.
With V2 control mode selection P012, you can select four types of control modes: Speed control,
Pulse train position control, Absolute position control, and High-resolution absolute position control.
Note the following before use:
• Sufficient characteristics may not be obtained if you select a motor size two or more ranks lower than
the maximum applicable motor size.
• If the Inverter does not normally accelerate, or if overload protection is activated, check the phase order
of the encoder signal.
(If phase A is advanced by 90
°
from phase B during forward run, it is judged as being normal.)
When running the Inverter with V/f characteristics selection A044 set to "00" (VC), you can check
the rotation direction with real frequency monitor d008.
(If positive frequency is detected when the forward command is activated, or if negative frequency
is detected when the reverse command is activated, the rotation direction is judged as being
normal.)
If sensor vector control cannot provide the desired characteristics, adjust the motor parameters de-
pending on the phenomena, as shown in the table below.
Note 1: Make sure that the carrier frequency (b083) is not lower than 2.1 kHz. If the carrier frequency is at 2.1 Hz
or lower, the Inverter does not operate normally.
Note 2: To use a lower rank motor size than the Inverter, set a torque limit value (b041 to b044), while keeping
the value
α
, calculated with the following formula, at 200% or lower. Otherwise, the motor may burn out.
α
= Torque limit set value × (Inverter capacity) / (Motor capacity)
(Example) If the Inverter capacity is 0.75 kW and the motor capacity is 0.4 kW, the torque limit set value
for
α
= 200%, calculated with the above formula, is as follows:
Torque limit set value (b041 to b044) =
α
× (Motor capacity) / (Inverter capacity)
= 200% × (0.4 kW)/(0.75 kW) = 106%
Operation status Phenomenon Adjusting method Adjustment item
During startup
Shock occurs during
startup.
Reduce motor parameter J from the set parameter. H024/H034
During
deceleration
Motor hunting
Reduce the speed response. H005
Reduce motor parameter J from the set parameter. H024/H034
During
torque limit
Insufficient torque at low
frequency during torque
limit
Set a overload limit level lower than that of the
torque. b021
b041 to b044
Low-frequency
operation
Rotation is not constant. Increase motor parameter J from the set parameter. H024/H034
Related functions
A001, A044, F001, b040 , H002, H003, H004 , H020 , H021 , H022 ,
H023 , H050 , H051 , H052 , P011, P012