YASKAWA Varispeed L7 User Manual

5-40
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 overtemperature, an overheating
pre-alarm 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 overtemperature occurs can be selected.
If a multifunction output is programmed for this function the output is switched ON when the heatsink temper-
ature exceeds the overheat pre-alarm level set in L8-02.
Related Parameters
* The factory setting depends on the inverter capacity.
Multifunction Outputs (H2-01 to H2-03)
 Input Open Phase Protection
This function detects an open input phase by observing the DC bus ripple level.
Related Parameters
The factory setting is enabled. It is not recommended to disable this function.
Parameter
No.
Name
Factory
Setting
Change
during
Operation
Control Methods
V/f
Open
Loop
Vector
Closed
Loop
Vector
L8-02 Overheat pre-alarm level 75°C * No A A A
L8-03 Inverter overheat (OH) pre-alarm operation selection 3 No A A A
Set Value Function
Control Methods
V/f
Open
Loop
Vector
Closed
Loop
Vector
20 Inverter overheat (OH) Yes Yes Yes
Parameter
No.
Name
Factory
Setting
Change
during
Operation
Control Methods
V/f
Open
Loop
Vector
Closed
Loop
Vector
L8-05 Input open-phase protection selection 1 No A A A
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YASKAWA Varispeed L7 Specifications

General

Brand	YASKAWA
Model	Varispeed L7
Category	Inverter
Language	English