FE FRENIC-Multi series, Instruction Manual

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5-20
• Auto t
This fun r
light loa
over-exc
the moto
orque boost
tion automatically optimizes the output voltage to fit the motor with its load. Unde
d, auto torque boost decreases the output voltage to prevent the motor from
itation. Under heavy load, it increases the output voltage to increase output torque of
r.
c
• Since this function relies al
frequency 1 (F04), the ra
so on the characteristics o
ted voltage at base frequency 1 (F0
f the motor, set the base
5), and othe r
pertinent motor para 99) in line with
the motor capacity and characteristics, or else perform auto-tuning (P04).
• When a special motor is driven or the load does not have sufficient rigidity, 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 pe
meters (P01 through P03 and P06 through P
r
F09 (F37 = 0 or 1).
„
Auto energy saving operation
This feature automatically controls the supply voltage to the motor to minimize the total power
loss of motor and inverter. (Note that this feature may not be effective depending upon the
motor or load characteristics. Check the advantage of energy saving before actually apply this
feature to your power system.)
This feature applies to constant speed operation only. During acceleration/deceleration, the
inverter will run with manual torque boost (F09) or auto torque boost, depending on the F37
ata. If auto energy saving operation is enabled, the response to a change in motor speed
ay be slow. Do not use this feature for such a system that requires quick acceleration/
d
m
deceleration.
• Use auto energy sav
base frequency is set at
ing only where the base frequency is 60 Hz or lower. If the
60 Hz or higher, you may get a little or no energy saving
frequency 1 (F04), the rated voltage at base frequency 1 (F05), and othe
advantage. The auto energy saving operation is designed for use with the
frequency lower than the base frequency. If the frequency becomes higher than
the base frequency, the auto energy saving operation will be invalid.
• Since this function relies also on the characteristics of the motor, set the base
r
pertinent motor parameters (P01 through P03 and P06 through P99) in line with
the motor capacity and characteristics, or else perform auto-tuning (P04).
Electronic Thermal Overload Protection for Motor 1 (Select motor chara
F10
F11
F12
cteristics)
Electronic Thermal Overload Protection for Motor 1 (Overload detection level)
Electronic Thermal Overload Protection for Motor 1 (Thermal time constant)
F10 thro
overload
F10 sele
es the
overload dete
ugh F12 specify the thermal characteristics of the motor for its electronic thermal
protection that is used to detect overload conditions of the motor inside the inverter.
cts the motor cooling mechanism to specify its characteristics, F11 specifi
ction 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."
„
Select motor characteristics (F10)
F10 selects the cooling mechanism of the motor-- shaft-driven or separately powered cooling
fan.
Data for F10 Function
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.)