Instruction manual

4-69
 Allowable average loss (F51)
The allowable average loss refers to a tolerance for motor continuous operation, which is obtained based on
the %ED (%) and motor rated capacity (HP).
Data for F51
Function
0.001 to 99.99
0.001 to 99.99 (kW)
During deceleration:
Allowable average loss (kW) =
%ED(%) ÷ 100 x Motor rated capacity (HP) x 0.75
2
Equation (3)
During constant speed operation:
Allowable average loss (kW) =
%ED(%) ÷ 100 x Motor rated capacity (HP) x 0.75
2
Equation (4)
 Resistance (F52)
F52 specifies the resistance of the braking resistor.
F80
Switching between LD, MD and HD drive modes
F80 specifies whether to drive the inverter in the low duty (LD), medium duty (MD), or high duty (HD) mode as
described below.
To change the F80 data, it is necessary to press the" + keys" or " + keys" (simultaneously keying).
F80
data
Drive mode
Application
Continuous rated current level
Overload
capability
Maximum
frequency
1
LD (Variable
Torque) mode
Light load
Drive a motor whose capacity is the
same as the inverter's one.
120% for 1 min.
120 Hz
2
MD (Constant
Torque) mode
Medium load
Drives a motor whose capacity is the
same as the inverter's one or derates
a motor one rank lower than the
inverter's capacity.
150% for 1 min.
120 Hz
0
HD (CT-Vector)
mode
Heavy load
Derates a motor one or two ranks
lower than the inverter's capacity.
150% for 1 min.
200% for 3 s
500 Hz
Switching to the MD/HD mode increases the overload capability (%) against the continuous current level up to
150%, but it requires derating the motor one or two ranks lower than the inverter's capacity.
Note: For 7.5 HP or smaller, when LD mode is selected, the HD mode specification applies.
For the rated current level, see Chapter 11 "SPECIFICATIONS."