2.1.1 High Voltage
The voltage of the adjustable frequency drive is dangerous whenever the adjustable frequency drive is connected to line power.
Incorrect installation or operation of the motor or adjustable frequency drive may cause damage to the equipment, serious personal
injury or death. The instructions in this manual must therefore be observed, in addition to applicable local and national rules and safety
regulations.
Installation in high altitudes
380-500 V: At altitudes higher than 10,000 ft [3 km], please contact Danfoss Drives regarding PELV.
525-690 V: At altitudes higher than 6,500 ft [2 km], please contact Danfoss Drives regarding PELV.
2.1.2 Safety Instructions
•
Make sure the adjustable frequency drive is properly grounded.
•
Protect users against supply voltage.
•
Protect the motor against overloading in accordance with national and local regulations.
•
Motor overload protection is not included in the default settings. To add this function, set parameter 1-90
Motor thermal protection
to value
ETR trip
or
ETR warning
. For the North American market: ETR functions provide class 20 motor overload protection, in accordance with NEC.
•
The ground leakage current exceeds 3.5 mA.
•
The [OFF] key is not a safety switch. It does not disconnect the adjustable frequency drive from line power.
2.1.3 General Warning
Warning:
Touching the electrical parts may be fatal - even after the equipment has been disconnected from line power.
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 adjustable frequency drive: wait at least 40 minutes.
Shorter time is allowed only if indicated on the nameplate for the specific unit.
Leakage Current
The ground leakage current from the adjustable frequency drive exceeds 3.5 mA. To ensure that the ground cable has a good me-
chanical connection to the ground connection (terminal 95), the cable cross-section must be at least 3.9 in
2
[10 mm
2
] or have 2 rated
ground wires terminated separately. For proper grounding for EMC, see the section
Grounding
in the
How to Install
chapter.
Residual Current Device
This product can cause DC current in the protective conductor. If a residual current device (RCD) is used for extra protection, only an
RCD of Type B (time delayed) may be used on the supply side of this product. See also RCD Application Note MN.90.Gx.02 (x=version
number).
Protective grounding of the adjustable frequency drive and the use of RCDs must always follow national and local regulations.
2 Safety Instructions and General Warning
VLT
®
Automation Drive FC 300
Instruction Manual High Power
2-2
MG.33.U2.22 - VLT
®
is a registered Danfoss trademark
2
