734
YASKAWA ELECTRIC
SIEP C710617 19A YASKAWA AC Drive CR700 Technical Manual
n4-70: Speed Command Comp @ Low Freq
No.
(Hex.)
Name
Description
Default
(Range)
n4-70
(1B8A)
Speed Command
Comp @ Low Freq
Adjust this to improve stability when running at low speeds. Usually it is
not necessary to change this setting.
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.
1
(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
n4-73: PGo Recovery Selection
No.
(Hex.)
Name
Description
Default
(Range)
n4-73
(1B8D)
PGo Recovery
Selection
Sets the restart mode to Without Encoder Mode or the With Encoder Mode
when an encoder is disconnected.
0
(0, 1)
Set
A1-02 = 4 [Control Method Selection = Advanced Open Loop Vector]
and
n4-72 = 1 [Speed Feedback Mode
= With Encoder]
to use this parameter.
Parameter
F1-02 [Encoder Signal Loss Detect Sel]
, sets the drive response when the drive detects a disconnected
encoder. This parameter sets the drive to start up in the Without Encoder Mode or With Encoder Mode when the
drive detects
PGo [Encoder (PG) Feedback Loss]
.
Note:
A PG-B3 encoder option is necessary to use this parameter. When you use a PG-X3 option, it is not necessary to set this parameter.
If the drive detects
PGo
, de-energize the drive and examine the wiring for the encoder.
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
