Danfoss VLT AutomationDrive EZ FC 321 Programming Manual page 281

VLT® AutomationDrive EZ FC 321
Programming Guide
Current
% of rated
110
105
100
95
~ ~
60s
Desired current>100%
Inverter
load
counter
100
98
90.7
Warning
Illustration 80: Output Current in Overload Condition
If the motor is unable to run continuously with the demanded capacity, run it at reduced speed for a while.
Select parameter 14-61 Function at Inverter Overload to automatically reduce motor speed until the output current is below 100% of
the rated current (set in parameter 14-62 Inv. Overload Derate Current). Parameter 14-61 Function at Inverter Overload is an alternative
to letting the drive trip.
The drive estimates the load on the power section with an inverter load counter, which causes a warning at 98% and a reset of the
warning at 90%. At the value 100%, the drive trips and issues an alarm. Status for the counter can be read in parameter 16-35 Inverter
Thermal.
If parameter 14-61 Function at Inverter Overload is set to [3] Derate, the motor speed is reduced when the counter exceeds 98%, and
stays reduced until the counter has dropped below 90.7%. If parameter 14-62 Inv. Overload Derate Current is set to for example 95%,
a steady overload causes the pump speed to fluctuate between values corresponding to 110% and 95% of rated output current for
the drive.
Parameter 14-61 Function at Inverter Overload
Table 515: Parameter 14-61 Function at Inverter Overload
14-61 Function at Inverter Overload
Default Value: [0] Trip
Conversion Index: -
Use if there is a steady overload beyond the thermal limits (110% for 60 s).
Option Name Description
[0]* Trip
Select [0] Trip to make the drive trip and issue an alarm.
[1] Derate Reduces the motor speed to decrease the load on the power section and allowing it to cool down.
Parameter 14-62 Inv. Overload Derate Current
Table 516: Parameter 14-62 Inv. Overload Derate Current
14-62 Inv. Overload Derate Current
Default Value: 95%
Conversion Index: 0
Enter the current level (in % of rated output current for the drive) when running with reduced motor speed after load on the drive
has exceeded the allowable limit (110% for 60 s).
Danfoss A/S © 2021.08
Time
Time
Warning
Parameter Type: Option
Data Type: Uint8
Parameter Type: Range, 50 - 100%
Data Type: Uint16
Parameter Descriptions
Setup: All set-ups
Change during operation: True
Setup: All set-ups
Change during operation: True
AU373327181955en-000101 / 130R1208 | 281