Inverter Protection; Inverter Overheat Protection; Input Open Phase Protection - Omron VARISPEED L7 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 sudden and unexpected stop of the inverter due to an over temperature, an overheat 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 over temperature occurs can be selected.
If a multifunction output is set to 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.
L8-02 Overheat pre-alarm level
L8-03 Inverter overheat (OH) pre-alarm operation selection
*1. The factory setting depends on the inverter capacity.
Multifunction Outputs (H2-01 to H2-03)
Set Value
20 Inverter overheat (OH)

Input Open Phase Protection

This function detects an open input phase by observing the DC bus voltage ripple level.
Related Parameters
Parameter
No.
L8-05 Input open-phase protection selection
The factory setting is enabled. It is not recommended to disable this function.
* This function is not available in software version VSL701034 and higher.
Name
Function
*
Name
Control Methods
Change
Factory
during
Setting
V/f
Operation
Vector
*1
No A
95°C
3 No A
Control Methods
Open
V/f Loop
Vector
Yes Yes
Control Methods
Change
Factory
Open
during
Setting
V/f
Operation
Vector
1 No A
Closed
Open Closed
Loop
Loop Loop
Vector
Vector
(PM)
A A A
A A A
Closed
Closed
Loop
Loop
Vector
Vector
(PM)
Yes Yes
Closed
Closed
Loop
Loop Loop
Vector
Vector
(PM)
A A A
6-
6
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