1. Safety
1.1.1. Symbols
Symbols used in this Operating Instructions.
NB!
Indicates something to be noted by the reader.
Indicates a general warning.
Indicates a high-voltage warning.
* Indicates default setting
1.1.2. High Voltage Warning
The voltage of the frequency converter is dangerous whenever it is connected to
mains. Incorrect installation of the motor or frequency converter may cause damage
to the equipment, serious injury or death. Consequently, it is essential to comply
with the instructions in this manual as well as local and national rules and safety
regulations.
Installation at high altitudes:
At altitudes above 2 km, please contact Danfoss Drives regarding PELV.
1.1.3. Safety Instructions
• Make sure the frequency converter is properly connected to earth.
• Do not remove mains connections, motor connections or other power connections while
the frequency converter is connected to mains.
• Protect users against supply voltage.
• Protect the motor against overloading according to national and local regulations.
• Motor overload protection is included in the default settings. Parameter 1-90
Motor ther-
mal protection
is set to value
ETR trip.
For the North American market: ETR functions
provide class 20 motor overload protection, in accordance with NEC.
• The earth leakage current exceeds 3.5 mA.
• The [OFF] key is not a safety switch. It does not disconnect the frequency converter from
mains.
VLT
®
HVAC Drive Operating Instructions 1. Safety
MG.11.A4.02 - 09.10.06. VLT
®
is a registered Danfoss trademark
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