Mitsubishi Electric 800 Series Instruction Manual page 543

5.13.4 Excitation current low-speed scaling factor
Magnetic flux Magnetic flux Magnetic flux
Under Advanced magnetic flux vector control, the excitation current scaling factor in the low-speed range can be adjusted.
Pr.
14 Load pattern selection
G003
85 Excitation current break
G201 point
86 Excitation current low-
G202 speed scaling factor
617 Reverse rotation excitation
G080 current low-speed scaling
factor
565 Second motor excitation
G301 current break point
566 Second motor excitation
G302 current low-speed scaling
factor
*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.14 setting
RT signal OFF
0, 1 Pr.86
12 Pr.86
13 Pr.617
14 Pr.86
15 Pr.617
542
5. PARAMETERS
5.13 (G) Control parameters
Name Initial
value
1
9999
9999
9999
9999
9999
Excitation current scaling factor
Pr.86
(Pr.566)
100%
0
During forward rotation
RT signal ON
Pr.566
Pr.566
Pr.617
Pr.566
Pr.566
Setting
range
0 Excitation current low-speed
scaling factor: Pr.86
1
Forward rotation excitation current low-speed scaling factor: Pr.86
*2
12
Reverse rotation excitation current low-speed scaling factor: Pr.617
Forward rotation excitation current low-speed scaling factor: Pr.617
*2
13
Reverse rotation excitation current low-speed scaling factor: Pr.86
Forward rotation excitation current low-speed scaling factor: Pr.86
*2
14
Reverse rotation excitation current low-speed scaling factor: Pr.617
*2 Forward rotation excitation current low-speed scaling factor: Pr.617
15
Reverse rotation excitation current low-speed scaling factor: Pr.86
0 to 400 Hz Set the frequency at which increased excitation is started.
9999 10 Hz is applied.
0 to 300% Set an excitation current scaling factor at 0 Hz.
9999 130% is applied.
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.
0 to 400 Hz Set an excitation current break point when the RT signal is ON.
9999 10 Hz is applied.
0 to 300% Set an excitation current low-speed scaling factor when the RT signal
is ON.
9999 130% is applied.
Pr.85
Output frequency
(Pr.565)
During reverse rotation
RT signal OFF RT signal ON
Pr.86 Pr.566
Pr.617 Pr.617
Pr.86 Pr.566
Pr.617 Pr.566
Pr.86 Pr.566
Description
*1
For constant-torque load
*1
For variable-torque load