Danfoss VLT AutomationDrive FC 302, Operating Instructions Manual, Page: 9 / 122

2.1.6 General Warning
WARNING
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 load-sharing (linkage of DC
intermediate circuit), as well as the motor connection for
kinetic back-up.
When using the frequency converter: wait at least 40
minutes.
Shorter time is allowed only if indicated on the
nameplate for the specific unit.
CAUTION
The earth leakage current from the frequency converter
exceeds 3.5 mA. To ensure that the earth cable has a
good mechanical connection to the earth connection
(terminal 95), the cable cross section must be at least 10
mm
2 or 2 rated earth wires terminated separately. For
proper earthing for EMC, see chapter 3.5.2 Grounding .
Residual Current Device
This product can cause a D.C. current in the protective
conductor. Where a residual current device (RCD) is used
for extra protection, only an RCD of Type B (time
delayed) shall be used on the supply side of this
product. See also
RCD Application Note MN90GX02
(x=version number).
Protective earthing of the frequency converter and the
use of RCDs must always follow national and local
regulations.
2.1.7 Before Commencing Repair Work
1. Disconnect the frequency converter from mains.
2. Disconnect DC bus terminals 88 and 89 from load
share applications.
3. Wait for discharge of the DC-link. See period of
time on the warning label.
4. Remove motor cable.
2.1.8 Avoid Unintended Start
While the frequency converter is connected to mains,
the motor can be started/stopped using digital
commands, bus commands, references or via the Local
Control Panel (LCP):
•
Disconnect the frequency converter from mains
whenever personal safety considerations make it
necessary to avoid unintended start.
•
To avoid unintended start, always activate the
[Off] key before changing parameters.
•
An electronic fault, temporary overload, a fault in
the mains supply, or lost motor connection may
cause a stopped motor to start. The frequency
converter with Safe Stop provides protection
against unintended start, if the Safe Stop
Terminal 37 is deactivated or disconnected.
2.1.9 Safe Torque Off (STO)
To run Safe Torque Off, additional wiring for the frequency
converter is required, refer to
Safe Torque Off Operating
Instructions for Danfoss VLT
®
Frequency Converters for
further information.
2.1.10 IT Mains
Parameter 14-50 RFI Filter can be used to disconnect the
internal RFI capacitors from the RFI filter to ground in the
380-500 V frequency converters. This reduces the RFI
performance to A2 level. For the 525-690 V frequency
converters,
14-50 RFI Filter has no function. The RFI switch
cannot be opened.
Safety Instructions and Gen...
VLT
®
Automation Drive FC 300 Operating Instructions
MG33U402 - Rev. 2013-12-16 7
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