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Chapter 12. Protective functions
12.1 Electronic Thermal
Group
LED
display
Parameter Name
Set
value
Min/Max
setting
Factory
default
Unit
F50
[Electronic thermal
select]
1
0/1 0
F51
[Electronic thermal level for
1 minute]
- 150 %
F52
[Electronic thermal level for
continuous]
-
50/150
100 %
Function
group 1
F53
[Motor type]
- 0/1 0
Select F50 – [Electronic thermal select] to 1.
It activates when the motor is overheated (time-inverse). If current greater than set in F51 flows,
inverter output is turned off for the preset time in F51- [Electronic thermal level for 1 minute].
F51: Enter the value of max current that is capable of flowing to the motor continuously
for one minute. It is set in percent of motor rated current. The value cannot be set
lower than F52.
F52: Enter the amount of current for continuous operation. Normally motor rated
current is used. It cannot be set greater than F51.
F53: For an inductance motor, cooling effects decrease when a motor is running at low
speed. A special motor is a motor that uses a separately powered cooling fan
maximize cooling effect even in low speed. Therefore, as the motor speed changes,
the cooling does not change.
0
Standard motors having a cooling fan directly
connected to the shaft
F53 [Motor type]
1
Special motor that uses a separately powered
cooling fan.
Current for
continuous [%]
100
95
65
20 60
Freq [Hz]
H53 = 1
H53 = 2
Current [%]
F51
F52
60 ETH trip time [sec]
110