Mitsubishi Electric FR-D720S SC EC Instruction Manual page 197

Parameter
Constant-torque load application (Pr. 14 = 2 oder 3)
Set "2" when a vertical lift load is fixed as power driving load at forward rotation and regenerative
load at reverse rotation.
Pr. 0 "Torque boost" is valid during forward rotation and torque boost is automatically changed
to "0%" during reverse rotation. Pr. 46 "Second torque boost" is made valid when the RT signal
turns on.
Set "3" for an elevated load that is in the driving mode during reverse rotation and in the regen-
erative load mode during forward rotation according to the load weight, e.g. counterweight sys-
tem.
For vertical lift loads
At forward rotation boost ...... Pr. 0 (Pr. 46) setting,
At reverse rotation boost ...... 0%
(Lifts, hoists, elevators)
Fig. 6-14: Characteristic with manual torque boost
NOTES
For the RT signal, set "3" in any of Pr. 178 to Pr.182 "Input terminal function selection" to
assign the function.
When torque is continuously regenerated as vertical lift load, it is effective to set the rated
voltage in Pr. 19 "Base frequency voltage" to prevent trip due to current at regeneration.
In addition, when the RT signal is on, the other second functions are also valid.
Load pattern selection does not function under general-purpose magnetic flux vector cont-
rol.
Changing the terminal assignment using Pr. 178 to Pr. 182 may affect the other functions.
Make setting after confirming the function of each terminal.
FR-D700 SC EC
Pr. 14 = 2
Forward
rotation
Reverse
rotation
Pr. 0
Pr. 46
Base frequency Pr. 3
Output frequency
Pr. 14 = 3
For vertical lift loads
At forward rotation boost...... 0%,
At reverse rotation boost...... Pr. 0 (Pr. 46) setting
(Lifts, hoists, elevators)
Pr. 0
Pr. 46
Hz
Set V/f pattern
Reverse
rotation
Forward
rotation
Hz
Base frequency Pr. 3
Output frequency
I001547E
6 - 47