542
5. PARAMETERS
5.13 (G) Control parameters
5.13.4 Excitation current low-speed scaling factor
Under Advanced magnetic flux vector control, the excitation current scaling factor in the low-speed range can be adjusted.
*1 The setting is applied to the operation under V/F control.
*2 The setting is valid only under Advanced magnetic flux vector control. When Pr.14 = "12 to 15" and V/F control is selected, the operation is the
same as the one for constant-torque load (Pr.14 = "0").
• Under Advanced magnetic flux vector control, excitation current in the low-speed range can be increased to improve
torque. When Pr.14 = "12 to 15", the excitation current scaling factor can be switched for the forward/reverse rotation.
• Increased excitation is applied when the output frequency is equal to or lower than the setting in Pr.85 Excitation current
break point. The excitation current scaling factor at 0 Hz is set in Pr.86 Excitation current low-speed scaling factor.
Use Pr.565 Second motor excitation current break point and Pr.566 Second motor excitation current low-speed
scaling factor for the setting for using the second motor (RT signal-ON).
• An excitation current low-speed scaling factor set in the parameter shown in the table is used according to the Pr.14 setting
and other conditions.
Pr. Name Initial
value
Setting
range
Description
14
G003
Load pattern selection 1 0 Excitation current low-speed
scaling factor: Pr.86
For constant-torque load
*1
1
For variable-torque load
*1
12
*2
Forward rotation excitation current low-speed scaling factor: Pr.86
Reverse rotation excitation current low-speed scaling factor: Pr.617
13
*2
Forward rotation excitation current low-speed scaling factor: Pr.617
Reverse rotation excitation current low-speed scaling factor: Pr.86
14
*2
Forward rotation excitation current low-speed scaling factor: Pr.86
Reverse rotation excitation current low-speed scaling factor: Pr.617
15
*2
Forward rotation excitation current low-speed scaling factor: Pr.617
Reverse rotation excitation current low-speed scaling factor: Pr.86
85
G201
Excitation current break
point
9999 0 to 400 Hz Set the frequency at which increased excitation is started.
9999 10 Hz is applied.
86
G202
Excitation current low-
speed scaling factor
9999 0 to 300% Set an excitation current scaling factor at 0 Hz.
9999 130% is applied.
617
G080
Reverse rotation excitation
current low-speed scaling
factor
9999 0 to 300% Set an excitation current scaling factor when different excitation
current scaling factors are used for forward and reverse rotation.
9999 130% is applied.
565
G301
Second motor excitation
current break point
9999 0 to 400 Hz Set an excitation current break point when the RT signal is ON.
9999 10 Hz is applied.
566
G302
Second motor excitation
current low-speed scaling
factor
9999 0 to 300% Set an excitation current low-speed scaling factor when the RT signal
is ON.
9999 130% is applied.
Pr.14 setting During forward rotation During reverse rotation
RT signal OFF RT signal ON RT signal OFF RT signal ON
0, 1 Pr.86 Pr.566 Pr.86 Pr.566
12 Pr.86 Pr.566 Pr.617 Pr.617
13 Pr.617 Pr.617 Pr.86 Pr.566
14 Pr.86 Pr.566 Pr.617 Pr.566
15 Pr.617 Pr.566 Pr.86 Pr.566
Magnetic fluxMagnetic fluxMagnetic flux
Excitation current scaling factor
100%
0
Output frequency
Pr.86
(Pr.566)
Pr.85
(Pr.565)
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