Danfoss VLT AutomationDrive FC 302 Programming Guide

110
e30ba260.10
105
100
95
60s
100
90.7
98
Current
% of rated
Time
Desired current>100%
Inverter
load
counter
Time
Warning Warning
~
~
Illustration 89: 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 751: Parameter 14-61 Function at Inverter Overload
14-61 Function at Inverter Overload
Default value: [0] Trip
Parameter type: Option
Setup: All setups
Conversion index: -
Data type: Uint8
Change during operation: True
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 752: Parameter 14-62 Inv. Overload Derate Current
14-62 Inv. Overload Derate Current
Default value: 95%
Parameter type: Range, 50 - 100%
Setup: All setups
Conversion index: 0
Data type: Uint16
Change during operation: True
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).
AU275636650261en-000101 / 130R0334 | 473Danfoss A/S © 2022.12
Parameter Descriptions
VLT AutomationDrive FC 301/302
Programming Guide

Danfoss VLT AutomationDrive FC 302 Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 302
Category	DC Drives
Language	English