5-21
F40
Torque limiter 1 (Driving)
F41 Torque limiter 1 (Braking)
◆ The torque limiting operation calculates the motor torque from the output voltage, current, resistance of
the primary winding of the motor and other data to control the frequency so that the calculated value
does not exceed the control value. This operation insures inverter operation without tripping upon
abrupt changes in the load torque while the limit value is maintained.
◆ Select the limit values of the driving torque and braking torque.
◆ The acceleration/deceleration operation time during activation of this function becomes longer than the
set acceleration/deceleration time. When the driving torque is limited during constant speed operation,
the frequency is lowered to reduce the load torque. (When the braking torque is limited, the contrary
occurs.)
Setting range: 20 to 200,999%
Set "999" to inactivate the torque limiter.
Set only the braking torque to "0" to automatically avoid OU tripping caused by power
regeneration.
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WARNING
• If the torque limiter has been selected, the inverter may operate at an
acceleration/deceleration time or speed different from the set ones. Design the
machine so that safety is ensured even in such cases.
Otherwise an accident could occur.
F42 Torque vector control 1
◆ The torque vector control calculates the torque suitable for the load to make the most of the motor
torque, and controls the voltage and current vectors to optimum ones according to the calculated value.
Setting State of operation
０
Inactive
１
Active
◆ When "1" (active) is selected, the settings of the following function codes become different from the
written ones.
1) F09 "Torque boost 1"
Works as "0" value (automatic torque boost).
2) P09 "Slip compensation control"
Slip compensation is automatically activated.
When "0" is set, the slip compensation amount of a Fuji's standard three-phase motor is assumed.
When the setting is other than "0", the written setting is applied.
Use the torque vector control function under the following conditions.
1) A single motor
If two or more motors are connected, accurate control is difficult.
2) The data of function codes of motor 1 (P03 "Rated current", P06 "No-load current", P07 "%R1" and P08
"%X") must be accurate.
If the standard three-phase motor made by Fuji is used, the above data is automatically input when
function code P02 "Capacity" is set. When another motor is used, perform auto tuning.
3) The rated motor current must not be too smaller than the rated inverter current. Though it depends on
the model, the one smaller by two ranks than the standard applicable motor of the inverter is the
allowable smallest motor.
4) The wiring distance between the inverter and motor must be up to 50 m. Too long a wiring distance
disables accurate control due to the leakage current flowing through the static capacity between the
cable and the ground.
5) When a reactor is connected between the inverter and the motor or when the wiring impedance is large
enough to be overlooked, change the data using P04 "Auto tuning".
If these conditions cannot be satisfied, change the setting to "0" (inactive).
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