Chapter 6 - Parameter Description [FU1]
95
[When Energy Save Level is set at 20%]
☞
Note:
This function is not recommended for a large load
or for an application that need frequent acceleration and
deceleration.
☞
Note:
This function does not work when ‘Sensorless’ is
selected in FU2-40 [Control Mode].
FU1-50: Electronic Thermal (Motor i
2
t) Selection
FU1-51: Electronic Thermal Level for 1 Minute
FU1-52: Electronic Thermal Level for
Continuous
FU1-53: Electronic Thermal Characteristic
(Motor type) selection
These functions are to protect the motor from
overheating without using additional thermal overload
relay. Inverter calculates the temperature rising of the
motor using several parameters and determines whether
or not the motor is overheated. Inverter will turn off its
output and display a trip message when the electronic
thermal feature is activated.
This function activates the ETH parameters by setting
‘Yes’.
This is the reference current when the inverter
determines the motor has overheated. It trips in one
minute when 150% of rated motor current established in
FU2-33 flows for one minute.
☞
Note:
The set value is the percentage of FU2-33 [Rated
Motor Current].
This is the current at which the motor can run
continuously. Generally, this value is set to ‘100%’ and
which means the rated motor current set in FU2-33. This
value must be set less than FU1-52 [ETH 1min].
☞
Note:
The set value is the percentage of FU2-33 [Rated
Motor Current].
[Motor i
2
t Characteristic Curve]
To make the ETH function (Motor i
2
t) work correctly, the
motor cooling method must be selected correctly
according to the motor.
[Self-cool] is a motor that has a cooling fan connected
directly to the shaft of the motor. Cooling effects of a
self-cooled motor decrease when a motor is running at
low speeds. The motor current is derated as the motor
speed decreases.
[Forced-cool] is a motor that uses a separate motor to
power a cooling fan. As the motor speed changes, the
cooling effect does not change.
Output Voltage
Output
Frequency
Reference Frequency
(Steady Speed)
100%
80%
FU1? ETH select
50 --- No ---
0
50
Factory Default:
No
0
FU1? ETH 1min
51 180 %
180
51
Factory Default:
180 %
180
FU1? ETH cont
52 120 %
120
52
Factory Default:
120 %
120
Load Current [%]
Trip Time
FU1-51
[ETH 1min]
1 minute
FU1-52
[ETH cont]
FU1? Motor type
53 Self-cool
0
53
Factory Default:
Self-cool
0
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