1. Safety
1.1.1. Symbols
Symbols used in this Instruction Manual.
NOTE
Indicates something to be noted by the reader.
Indicates a general warning.
Indicates a high voltage warning.
＊ Indicates a default setting
1.1.2. High Voltage Warning
The voltage of the adjustable frequency drive is dangerous whenever it is connected
to AC line power. Incorrect installation of the motor or adjustable frequency drive
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.
1.1.3. Safety Instructions
• Make sure the adjustable frequency drive is properly grounded.
• Do not remove line power connections, motor connections or other power connections
while the adjustable frequency drive is connected to line power.
• Protect users against supply voltage.
• Protect the motor against overloading in accordance with 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 ground leakage current exceeds 3.5 mA.
• The [OFF] key is not a safety switch. It does not disconnect the adjustable frequency
drive from the line power.
VLT
®
HVAC Drive Instruction Manual 1. Safety
MG.11.A4.22 - VLT
®
is a registered Danfoss trademark
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