5-21
F10 to F12
Electronic Thermal Overload Protection for Motor
(Select motor characteristics, Overload detection level, and Thermal time con-
stant)
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
inside the inverter.
F10 selects the motor cooling mechanism to specify its characteristics, F11 speci-
fies the overload detection current, and F12 specifies the thermal time constant.
Thermal characteristics of the motor specified by these function codes are
also used for the overload early warning. Therefore, even if you need only
the overload early warning, set these characteristics data to function
codes F10 and F12.
F10 selects the cooling mechanism of the motor--shaft-driven or separately pow-
ered cooling fan.
F10 set to :
To do this
1
For a general-purpose motor with shaft-driven cooling fan
(The cooling effect will decrease in low frequency operation.)
2
For an inverter-driven motor, non-ventilated motor, or motor with
separately powered cooling fan
(The cooling effect will be kept constant regardless of the output
frequency.)
F11 specifies the level at which an overload condition is to be recognized. Ordinarily,
set F11 to 1.0 to 1.1 times the allowable continuous current (rated current of the
motor (P03)) at the rated drive frequency (base frequency) of the motor. To disable
the electronic thermal function, set F11 to 0.00 (no effect).
F12 sets the thermal time constant of the motor. The inverter interprets the time
constant as an operation period of the electronic thermal function. During the
specified operation period, the inverter will activate the electronic thermal function if
150% current of the operation level specified by F11 flows continuously. The time
constant of Fuji general-purpose motors and other induction motors is set to ap-
proximately 5 minutes by factory default.
Data entry range: 0.5 to 75.0 (minutes, in 0.1-minute increment)
Refer to the FRENIC-Mini User’s Manual, Chapter 9 "FUNCTION CODES" for
details of the shaft-driven cooling fan and characteristics of the electronic
thermal function.
F14
Restart Mode after Momentary Power Failure
Selects the action of the inverter to be followed when a momentary power failure
occurs.
If the inverter detects that the DC link bus voltage has dropped to less than the
specified undervoltage limit during operation, it interprets the state as an occur-
rence of a momentary power failure. However, if the inverter runs with a light load
connected to the motor and the period of the power failure is too short, then it may
not detect the power failure and continue to run.
Содержание Frenic Mini FRN001C1E-2U
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