Danfoss VLT AutomationDrive FC 300 Design Manual page 14

Safety and Conformity
WARNING
High Voltage
2 2
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.
NOTE
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.
NOTE
Crane, Lifts and Hoists:
The controlling of external brakes must always have a
redundant system. The frequency converter can in no
circumstances be the primary safety circuit. Comply with
relevant standards, e.g.
Hoists and cranes: IEC 60204-32
Lifts: EN 81
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 s 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
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.
NOTE
It is recommended to disable protection mode in hoisting
applications (14-26 Trip Delay at Inverter Fault = 0)
12
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®
VLT AutomationDrive FC 300 Design Guide, 0.25-75 kW
The DC link capacitors remain charged after power has
been disconnected. Be aware that there may be high
voltage on the DC link even when the Control Card LEDs
are turned off. 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
Table 2.1 Discharge Time
2.2.1 Disposal Instruction
This Design Guide can be used for all FC 300 frequency
converters with software version 6.6x.
The software version number can be seen from 15-43 Software
Version.
2.3.1 CE Conformity and Labelling
The machinery directive (2006/42/EC)
Frequency converters do not fall under the machinery
directive. However, if a frequency converter is supplied for
use in a machine, we provide information on safety
aspects relating to the frequency converter.
What is CE Conformity and Labelling?
The purpose of CE labelling is to avoid technical trade
obstacles within EFTA and the EU. The EU has introduced
the CE label as a simple way of showing whether a
product complies with the relevant EU directives. The CE
label says nothing about the specifications or quality of
®
MG33BE02 - VLT is a registered Danfoss trademark
Power Waiting Time
0.25 - 7.5 kW 4 minutes
11 - 75 kW 15 minutes
11-75 kW (frame 15 minutes
size B and C)
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 currently valid legislation.
FC 300
Design Guide
Software version: 6.6x