Contents

Inverter Protection
Inverter Overheat Protection
The Inverter is protected against overheating using a thermistor that detects the heatsink temperature.
When the overheat temperature level is reached the inverter output is switched off.
To prevent a suddenly and unexpected stop of the inverter due to an over temperature, an overheating prealarm
can be output. The temperature level for that pre-alarm can be set in parameter L8-02. Using parameter
L8-03 the inverter operation when an over temperature occurs can be selected.
If a multifunction output is programmed for this function the output is switched ON when the heatsink temperature
exceeds the overheat pre-alarm level set in L8-02.
•Related Parameters
Parameter
No.
Name
Factory
Setting
Change
during
Operation
V/f
Control Methods
Open
Loop
Vector
L8-02 Overheat pre-alarm level 95°C * No A A A
L8-03 Inverter overheat (OH) pre-alarm operation selection 3 No A A A
Closed
Loop
Vector
* The factory setting depends on the inverter capacity.
Multifunction Outputs (H2-01 to H2-03)
Set Value
Function
V/f
Control Methods
Open
Loop
Vector
Closed
Loop
Vector
20 Inverter overheat (OH) Yes Yes Yes
Input Open Phase Protection
This function detects an open input phase by observing the DC bus ripple level.
•Related Parameters
Parameter
No.
Name
Factory
Setting
Change
during
Operation
V/f
Control Methods
Open
Loop
Vector
L8-05 Input open-phase protection selection 1 No A A A
Closed
Loop
Vector
The factory setting is enabled. It is not recommended to disable this function.
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