Inverter Protection; Inverter Overheat Protection - Omron VARISPEED E7 User Manual

Inverter Protection

Inverter Overheat Protection

The Inverter is protected against overheating using a thermistor that detects the heatsink temperature.
Related Parameters
Parameter
Number
L8-02 Overheat pre-alarm level
L8-03 Inverter overheat (OH) pre-alarm operation selection
L8-19 Frequency reference during OH pre-alarm
Multi-function Digital Outputs (H2-01 to H2-02)
Set Value
20 Inverter overheat pre-alarm (ON when overheat pre-alarm is active)
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 overtemperature, an overheating pre-alarm
can be output. Parameter L8-02 selects the pre-alarm temperature level, parameter L8-03 selects the inverter
reaction on the pre-alarm:
Setting 0: The Inverter decelerates to stop using deceleration time C1-02, OH fault is output.
•
Setting 1: The Inverter coasts to stop, OH fault is output.
•
• Setting 2: The Inverter decelerates to stop using the emergency stop time C1-09, OH fault is output.
Setting 3: The Inverter will continue operation and only display an OH alarm on the operator display.
•
• Setting 4: The Inverter will continue operation but reduce the output frequency order to reduce the load.
Parameter L8-19 defines the decrease in output frequency as a percentage of the maximum output fre-
quency E1-04. An OH alarm is output.
Name
Function

Inverter Protection

Change
Setting Factory
during
Range Setting
Operation
50 to 130 95°C No
0 to 4 4 No
0.0 to
20.0% No
20.0%
Access
Level
A
A
A
6-47