Danfoss VLT AQUA Drive FC 202 Programming Manual page 11

Introduction
WARNING
High Voltage
Touching the electrical parts may be fatal - even after
the equipment has been disconnected from mains.
Also make sure that other voltage inputs have been
disconnected, such as external 24 V DC, load sharing
(linkage of DC intermediate circuit), as well as the motor
connection for kinetic back-up.
Systems where frequency converters are installed must,
if necessary, be equipped with additional monitoring
and protective devices according to the valid safety
regulations, e.g. law on mechanical tools, regulations for
the prevention of accidents etc. Modifications on the
frequency converters by means of the operating
software are allowed.
NOTICE
Hazardous situations shall be identified by the machine
builder/integrator who is responsible for taking
necessary preventive means into consideration.
Additional monitoring and protective devices may be
included, always according to valid national safety
regulations, e.g. law on mechanical tools, regulations for
the prevention of accidents.
MG20O702
Programming Guide
Protection mode
Once a hardware limit on motor current or DC link voltage
is exceeded, the frequency converter enters the protection
mode. Protection mode means a change of the PWM
modulation strategy and a low switching frequency to
minimise losses. This continues for 10 s after the last fault
and increases the reliability and the robustness of the
frequency converter while re-establishing full control of the
motor.
Danfoss A/S © Rev. 2014-01-21 All rights reserved.
1 1
9