GE AF-300 P11 User Manual page 64

F09 Torque Boost 1
F 0 9 T R Q B O O S T 1
This is a Motor 1 function. The following can be se-
lected:
Selection of load characteristics such as automatic
torque boost, square law reduction torque load, propor-
tional torque load, constant torque load.
Enhancement of torque (V/f characteristics), which is
lowered during low-speed operation. Insufficient mag-
netic flux of the motor due to a voltage drop in the low-
frequency range can be compensated.
Setting Range Characteristics Selected
0.0 Automatic torque boost, where the torque
boost value of a constant torque load (a
linear change) is automatically adjusted.
0.1 to 0.9 Square law reduction torque for fan and
pump loads
1.0 to 1.9 Proportional torque for middle class loads
between square law reduction torque and
constant torque (linear change)
2.0 to 20.0 Constant torque (linear change)
Torque characteristics
< Square law reduction torque >
< Constant torque >
Since a large torque boost value creates over-excitation
in the low-speed range, continued operation may cause
the motor to overheat. Check the characteristics of the
driven motor.
F10
Electric thermal O/L relay (operation selection)
F11 Electric thermal O/L relay (level)
F12 Electric thermal O/L relay (thermal time)
The electronic thermal O/L relay manages the output
frequency, output current, and operation time of the
inverter to prevent the motor from overheating when
150% of the set current value flows for the time set by
F12 (thermal time constant).
< Proportional torque >
F 1 0 E L C T R N
Setting range 0: Inactive
1: Active (for general-purpose motor)
2: Active (for forced air motor)
This function specifies whether to operate the electronic
thermal O/L relay and selects the target motor. When a
general-purpose motor is selected, the operation level is
lowered in the low speed range according to the cooling
characteristics of the motor.
F 1 1 O L L E V E L 1
The setting range is 20 to 135% of the rated drive current.
This function sets the operation level current for the
electronic thermal O/L relay. Enter a value from 1 to 1.1
times the rated motor current value.
F 1 2 T I M E C N S T 1
The setting range is 0.5 to 75.0 minutes (in 0.1 minute
increments).
The time from when 150% of the operation level current
flows continuously to when the electronic thermal O/L
relay activates can be set with this function.
F13 Electric thermal O/L relay (for braking)
F 1 3 D B R O L
This function controls the frequent use and continuous
operating time of the braking resistor to prevent the
resistor from overheating.
Drive Capacity
15 Hp or less 0: Inactive
1: Inactive
2: Active (external braking resistor)
20 Hp or more 0: Inactive
5-11
O L 1
Operation