YASKAWA GA700 Technical Manual page 883

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n4-69: Response of Flux loop
No.
Name
(Hex.)
n4-69 Response of Flux
loop
(1B89)
If step-out occurs when the load changes, reduce the setting value in 1.00 increments.
Note:
If motor speed is reduced with heavy loads, increase n4-69 in increments of 1.00. If there is no improvement, increase n4-74 [Limit of
Flux loop] in increments of 20%.
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n4-70: Speed Command Comp @ Low Freq
No.
Name
(Hex.)
n4-70 Speed Command
Comp @ Low Freq
(1B8A)
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.
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n4-72: PG Mode
No.
Name
(Hex.)
n4-72 PG Mode
(1B8C)
Even when using Advanced Open Loop Vector Control, an encoder option (PG-B3 or PG-X3) can be connected.
Through combining the use of an encoder option, an even higher level of precision over control of the speed can
be obtained.
Note:
• When running machinery using an encoder option together with Advanced Open Loop Vector Control, specialized tuning of the drive
may be necessary. Ordinarily, a setting of A1-02 = 3 [Control Method Selection = Closed Loop Vector Control] should be used when
using an encoder option.
• When set to n4-72 = 1, the number of PG pulses should be set for F1-01 [PG 1 Pulses Per Revolution].
0 : WithOut PG
1 : With PG
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n4-73: PGO ret ope
No.
Name
(Hex.)
n4-73 PGO ret ope
(1B8D)
This function is effective when A1-02 = 4 [Control Method Selection = Advanced OpenLoop Vector Control] and
n4-72 = 1 [PG Mode = With PG] have been set.
The action to take upon detection of encoder disconnection is set with F1-02 [PG Feedback Loss Selection]. n4-
73 determines whether the drive is to start up in the WithOut PG mode, or is to start up in the With PG mode, after
PGo [PG Disconnect] is detected.
Note:
n4-73 is effective only when using an encoder option PG-B3. When using the PG-X3, there is no need to set n4-73.
If PGo is detected, de-energize the drive and inspect the wiring for the encoder.
0 : WithOut PG
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
V/f CL-V/f OLV CLV AOLV
Stabilizes motor vibrations through unified control of magnetic flux.
V/f CL-V/f OLV CLV AOLV
Adjust this to improve stability when running at low speeds. Normally there
is no need to change this setting.
V/f CL-V/f OLV CLV AOLV
Select whether an encoder option is to be connected or not when set to A1-
02 = 4 [Control Method Selection = Advanced OpenLoop Vector Control].
V/f CL-V/f OLV CLV AOLV
If the encoder is disconnected, this determines whether the drive is to restart
in the WithOut PG mode, or is to restart in the With PG mode.
11.10 n: Special Adjustment
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default Setting
(Range)
1.00
(0.00 - 60.00)
Default Setting
(Range)
0.60 Hz
(0.00 - 1.50 Hz)
Default Setting
(Range)
0
(0, 1)
Default Setting
(Range)
0
(0, 1)
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