Inverter Protection; Inverter Overheat Protection; Input Open Phase Protection - YASKAWA Varispeed L7 Instruction Manual

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
Parameter
No.
L8-02
L8-03
* The factory setting depends on the inverter capacity.
Multifunction Outputs (H2-01 to H2-03)
Set Value
20

Input Open Phase Protection

This function detects an open input phase by observing the DC bus ripple level.
Related Parameters
Parameter
No.
L8-05
The factory setting is enabled. It is not recommended to disable this function.
-40
5
Name
Overheat pre-alarm level
Inverter overheat (OH) pre-alarm operation selection
Inverter overheat (OH)
Name
Input open-phase protection selection
http://nicontrols.com
Factory
Setting
75°C *
3
Function
Factory
Setting
1
Control Methods
Change
Open Closed
during
V/f Loop Loop
Operation
Vector Vector
No A A
No A A
Control Methods
Open Closed
V/f Loop Loop
Vector Vector
Yes Yes Yes
Control Methods
Change
Open Closed
during
V/f Loop Loop
Operation
Vector Vector
No A A
A
A
A