Load Pattern Selection - Mitsubishi Electric 800 Series Instruction Manual

5.16.3

Load pattern selection

Optimal output characteristics (V/F characteristics) for application or load characteristics can be selected.
Pr. Name
14
Load pattern selection
G003
Application for constant-torque load (Pr.14 = "0", initial value)
• The output voltage will change linearly against the output frequency at the base frequency or lower.
• Set this parameter when driving a load that has constant load torque even when the rotation speed is changed, such as
conveyor, dolly, or roll drive.
POINT POINT
• Select for constant-torque load (setting value "0") even for fan and pump in following cases.
- When accelerating a blower with large moment of inertia (J) in a short period of time.
- When it is a constant-torque load such as rotary pump or gear pump.
- When the load torque increases in low speed such as screw pump.
Application for variable-torque load (Pr.14 = "1")
• The output voltage will change in square curve against the output frequency at the base frequency or lower. (1.75th-power
curve for FR-A860-00680 or higher)
• Set this parameter when driving a load with load torque change proportionally against the square of the rotation speed,
such as fan and pump.
Initial Setting
value range
0
1
2
3
0
4
5
12 to 15
Pr.14 = 0
100%
Pr. 3 Base frequency
Output frequency (Hz)
Pr.14 = 1
100%
Pr. 3 Base frequency
Output frequency (Hz)
(G) Control parameters
V/F V/F V/F
Description
For constant-torque load
For variable-torque load
For constant-torque lift
(boost at reverse rotation 0%)
For constant-torque lift
(boost at forward rotation 0%)
RT signal ON... for constant-torque load
RT signal OFF... for constant-torque lift, boost at reverse
rotation 0%
RT signal ON... for constant-torque load
RT signal OFF... for constant-torque lift, boost at forward
rotation 0%
Excitation current low-speed scaling factor (Refer to
595.)
PARAMETERS
page
5
GROUP
G
593