Electronic Thermal Overload Protection For Motor; Motor Characteristics; Auto Torque Boost - FujiFilm FVR-Micro Instruction Manual

• Auto torque boost

This function automatically optimizes the output voltage to fit the motor with its load.
Under light load, auto torque boost decreases the output voltage to prevent the
motor from over-excitation. Under heavy load, it increases the output voltage to
increase output torque of the motor.
• Since this function relies also on the characteristics of the motor, set the
• When a special motor is driven or the load does not have sufficient rigidity,
F10
Electronic Thermal Overload Protection for Motor 1 (Select motor characteristics)
F11
Electronic Thermal Overload Protection for Motor 1 (Overload detection level)
F12
Electronic Thermal Overload Protection for Motor 1 (Thermal time constant)
F10 through F12 specify the thermal characteristics of the motor for its electronic thermal
overload protection that is used to detect overload conditions of the motor.
F10 selects the motor cooling mechanism to specify its characteristics, F11 specifies the
overload detection current, and F12 specifies the thermal time constant.
Thermal characteristics of the motor specified by F10 and F12 are also used for the
overload early warning. Even if you need only the overload early warning, set these
characteristics data to these function codes. To disable the electronic thermal
overload protection, set function code F11 to "0.00."
 Motor characteristics (F10)
F10 selects the cooling mechanism of the motor-- shaft-driven or separately powered cooling fan.
Data for F10
1 For a general-purpose motor and Fuji standard permanent magnet synchronous
motor with shaft-driven cooling fan.
(The cooling effect will decrease in low frequency operation.)
2 For an inverter-driven motor with separately powered cooling fan.
(The cooling effect will be kept constant regardless of the output frequency.)
The figure below shows operating characteristics of the electronic thermal overload protection
when F10 = 1. The characteristic factors
switching frequencies f
The tables below list the factors determined by the motor capacity (P02) and the motor
characteristics (P99).
base frequency 1 (F04), the rated voltage at base frequency 1 (F05),
and other pertinent motor parameters (P02, P03 and P06 through P99)
in line with the motor capacity and characteristics, or else perform auto-
tuning (P04).
the maximum torque might decrease or the motor operation might become
unstable. In such cases, do not use auto torque boost but choose manual
torque boost per F09 (F37 = 0 or 1).
and f vary with the characteristics of the motor.
2 3
Function
α α
1 through 3 as well as their corresponding
5-25