Energy Saving Control; Adjustable 3 Points V/F - Mitsubishi Electric FR-CS84-012 Instruction Manual

NOTE
• When "2" (adjustable 3 points V/F) is set in Pr.71 Applied motor, "8888" or "9999" cannot be set in Pr.19.
Parameters referred to
Pr.29 Acceleration/deceleration pattern selection
Pr.71 Applied motor page 147

5.12.3 Energy saving control

The inverter will automatically perform energy saving operation without setting detailed parameters.
This control method is suitable for applications such as fans and pumps.
Pr. Name
60 Energy saving
G030 control selection
 Optimum excitation control (Pr.60 = "9").
• Set "9" in to select the Optimum excitation control mode.
Pr.60
• The Optimum excitation control is a control method to decide the output voltage by controlling the excitation current so the
efficiency of the motor is maximized.
NOTE
• In the Optimum excitation control mode, an energy saving effect cannot not be expected when the motor capacity is extremely
small compared with the inverter capacity or when multiple motors are connected to a single inverter.
• When the Optimum excitation control mode is selected, the deceleration time may become longer than the setting value. Also,
it may cause overvoltage more often compared to constant-torque load characteristics, so set the deceleration time longer.
• When the motor is unstable during acceleration, set the acceleration time longer.

5.12.4 Adjustable 3 points V/F

V/F V/F
By setting a desired V/F characteristic from the start up to the base frequency or base voltage with the V/F control (frequency
voltage/frequency), a dedicated V/F pattern can be generated.
The optimal V/F pattern matching the torque characteristics of the facility can be set.
Pr. Name
71
Applied motor
C100
100
V/F1 (first frequency)
G040
101 V/F1 (first frequency
G041 voltage)
102 V/F2 (second
G042 frequency)
103 V/F2 (second frequency
G043 voltage)
104
V/F3 (third frequency)
G044
105 V/F3 (third frequency
G045 voltage)
• By setting the
V/F1 (first frequency voltage / first frequency) to V/F3
be obtained.
• For an example, with the equipment with large static friction factor and small dynamic friction factor, large torque is required
only at the start up, so a V/F pattern that will raise the voltage only at the low-speed range is set.
• Setting procedure
page 95
Initial value Setting range
0
0
9
Initial value Setting range
2
0
Others
9999 0 to 400 Hz, 9999
0 V 0 to 1000 V
9999 0 to 400 Hz, 9999
0 V 0 to 1000 V
9999 0 to 400 Hz, 9999
0 V 0 to 1000 V
Description
Normal operation.
Optimum excitation control.
Description
Standard motor (such as SF-JR)
Adjustable 3 points V/F.
Refer to page 147.
Set each point of the V/F pattern (frequency, voltage).
9999: Do not set V/F.
parameters in advance, a desired V/F characteristic can
5.12 (G) Control parameters
2
2
3
4
5
6
7
8
9
10
195
5. PARAMETERS