Danfoss VLT AQUA Drive FC 202 Programming Manual page 11

Introduction
NOTICE
When using Safe Torque Off, always follow the
®
instructions in the VLT Frequency Converters - Safe
Torque Off Operating Instructions.
NOTICE
Control signals from or within the frequency converter
may in rare cases be activated in error, be delayed, or
fail to occur entirely. When used in situations where
safety is critical, these control signals must not be relied
on exclusively.
NOTICE
Hazardous situations must be identified by the machine
builder/integrator who is responsible for taking
necessary preventive means into consideration. More
monitoring and protective devices may be included,
always according to valid national safety regulations, for
example, law on mechanical tools, regulations for the
prevention of accidents.
MG20OB02
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
minimize 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.
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