Danfoss VLT AutomationDrive FC 300 Programming Guide

Protection Mode
Once a hardware limit on motor current or dc-link voltage is exceeded the frequency converter will enter “Protection mode”. “Protection mode” means a
change of the PWM modulation strategy and a low switching frequency to minimize losses. This continues 10 sec after the last fault and increases the
reliability and the robustness of the frequency converter while re-establishing full control of the motor.
In hoist applications “Protection mode” is not usable because the frequency converter will usually not be able to leave this mode again and therefore it
will extend the time before activating the brake – which is not recommendable.
The “Protection mode” can be disabled by setting par. 14-26
Trip Delay at Inverter Fault to zero which means that the frequency converter will trip
immediately if one of the hardware limits is exceeded.
NB!
It is recommended to disable protection mode in hoisting applications (par. 14-26
Trip Delay at Inverter Fault = 0)
1 Introduction FC 300 Programming Guide
10 MG.33.M8.02 - VLT
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1

Danfoss VLT AutomationDrive FC 300 Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 300
Category	DC Drives
Language	English