Danfoss FC 300 Design Manual page 12

2 Safety and Conformity
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.
2
Hoisting applications:
The frequency converter functions for controlling mechanical brakes cannot be considered as a primary safety circuit. There must always be a redundancy
for controlling external brakes.
Protection Mode
Once a hardware limit on motor current or dc-link voltage is exceeded the drive 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 drive while re-establishing full control of the motor.
In hoist applications "Protection mode" is not usable because the drive 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
of the hardware limits is exceeded.
NB!
It is recommended to disable protection mode in hoisting applications (par. 14-26
The DC link capacitors remain charged after power has been disconnected. To avoid electrical shock hazard, disconnect the frequency
converter from mains before carrying out maintenance. When using a PM-motor, make sure it is disconnected. Before doing service
on the frequency converter wait at least the amount of time indicated below:
Voltage
380 - 500 V
525 - 690 V
2.2.1 Disposal Instruction
12
Trip Delay at Inverter Fault
Power
0.25 - 7.5 kW
11 - 75 kW
90 - 200 kW
250 - 800 kW
11-75 kW (frame size B and C)
37 - 315 kW (frame size D)
355 - 1000 kW
Equipment containing electrical components may not be disposed of together with domestic
waste.
It must be separately collected with electrical and electronic waste according to local and cur-
rently valid legislation.
MG.33.BC.02 - VLT
to zero which means that the drive will trip immediately if one
Trip Delay at Inverter Fault
Waiting Time
4 minutes
15 minutes
20 minutes
40 minutes
15 minutes
20 minutes
30 minutes
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FC 300 Design Guide
= 0)