Chapter 6 - Parameter description [FU1]

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].

FU1► ETH cont

 

52

 

100

 

52

100 %

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Factory Default:

100 %

 

 

100

 

 

 

 

 

 

 

 

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].

power a cooling fan. As the motor speed changes, the cooling effects doe not change.

Output Current

Forced-Cool

100%

 

95%

 

 

Self-Cool

65%

 

20Hz

60Hz

[Load Current Derating Curve]

Note: Despite the motor current changing frequently due to load fluctuation or acceleration and deceleration, the inverter calculates the i2t and accumulates the value to protect the motor.

Load Current [%]

FU1-51 [ETH 1min]

FU1-52 [ETH cont]

1 minute

Trip Time

Related Functions: FU2-33 [Rated Motor Current]

FU1-54: Overload Warning Level

FU1-55: Overload Warning Time

FU1► OL level

 

54

 

150

 

54

150 %

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Factory Default:

150 %

 

 

150

 

[Motor i2t Characteristic Curve]

FU1► Motor type

 

53

 

0

 

53

Self-cool

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Factory Default:

Self-cool

0

 

 

 

 

 

 

 

 

 

To make the ETH function (Motor i2t) 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

FU1►

OL time

 

 

 

55

 

10.0

 

55

10.0 sec

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Factory Default:

10.0 sec

 

 

10.0

 

 

 

 

 

 

 

 

 

 

The inverter generates an alarm signal when the output current has reached the FU1-54 [Overload Warning Level] for the FU1-55 [Overload Warning Time]. The alarm signal persists for the FU1-55 even if the current has become the level below the FU1-54.

Multi-function output terminal (AXA-AXC) is used as the alarm signal output. To output the alarm signal, set I/O 44 [Multifunction Auxiliary Contact Output] to ‘OL’.

Note: Inverter is not tripped by this function.

Note: The set value is the percentage of FU2-33 [Rated

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Page 102
Image 102
HP 30 30 manual FU1-54 Overload Warning Level FU1-55 Overload Warning Time, FU1 ETH, FU1 OL level, FU1 Motor type Self-cool