YASKAWA CR700

11.10 n: Special Adjustment
776 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
■ n4-68: Speed Estimation Filter Time
No.
(Hex.)
Name Description
Default
(Range)
n4-68
(1B88)
Speed Estimation Filter
Time
Sets the primary delay time constant for the speed estimation value. Usually it is not necessary to
change this setting.
0.001 s
(0.001 - 0.010 s)
If the motor speed oscillates in the high speed range, set the value to 0.010 s.
■ n4-69: Flux Control Response
No.
(Hex.)
Name Description
Default
(Range)
n4-69
(1B89)
Flux Control Response
Unifies control of magnetic flux to make motor vibrations more stable.
1.00
(0.00 - 60.00)
If step-out occurs when the load changes, decrease the setting value in 1.00 increments.
Note:
If heavy loads decrease motor speed, increase the setting value in 1.00 increments. If it does not get better, increase n4-74 [Limit of Flux
Loop] in 20% increments.
■ n4-70: Speed Command Comp @ Low Freq
No.
(Hex.)
Name Description
Default
(Range)
n4-70
(1B8A)
Speed Command Comp @
Low Freq
Sets the function to make the drive more stable when it operates at low speeds. Usually it is not
necessary to change this parameter.
1.00 Hz
(0.00 - 6.00 Hz)
This function improves control stability when writing at low speeds. Increase the setting in 0.3 Hz increments at
the time of low-speed references with no load.
Note:
Although the stability of speed references for low speeds is improved when n4-70 is increased, it can sometimes negatively impact
speed control accuracy.
■ n4-71: Flux Estimation Method
No.
(Hex.)
Name Description
Default
(Range)
n4-71
(1B8B)
Expert
Flux Estimation Method
Sets the flux estimation method. Usually it is not necessary to change this setting.
0
(0, 1)
0 : Method 1
1 : Method 2
■ n4-72: Speed Feedback Mode
No.
(Hex.)
Name Description
Default
(Range)
n4-72
(1B8C)
Speed Feedback Mode
Sets the requirement for an encoder option when A1-02 = 4 [Control Method Selection =
Advanced Open Loop Vector].
0
(0, 1)
You can connect a PG-B3 or PG-X3 encoder option in AOLV control. You can use the encoder option for better
speed control precision.
Note:
• When you use an encoder option in AOLV control to operate machinery, specialized tuning of the drive can be necessary. You should
usually set A1-02 = 3 [Control Method Selection = Closed Loop Vector] when you use an encoder option.
• When you set this parameter to 1, also set the number of PG pulses in F1-01 [Encoder 1 Pulse Count (PPR)].
0 : Without Encoder
1 : With Encoder
V/f
CL-V/f
OLV
CLV
AOLV
V/f
CL-V/f
OLV
CLV
AOLV
V/f
CL-V/f
OLV
CLV
AOLV
V/f
CL-V/f
OLV
CLV
AOLV
V/f
CL-V/f
OLV
CLV
AOLV