VLT
®
4000 VT
Introduction
It is the responsibility of the user or the
person installing the VLT to provide proper
grounding, as well as motor overload and
branch circuit protection according to the National
Electrical Code (NEC
®
) and local codes.
NOTE
Electrostatic Precaution; Electrostatic discharge
(ESD). Many electronic components are
sensitive to static electricity. Voltages so low
that they cannot be felt, seen or heard, can reduce
the life, affect performance, or completely destroy
sensitive electronic components. When performing
service, proper ESD equipment should be used to
prevent possible damage from occurring.
The VLT Adjustable Frequency Drive
contains dangerous voltages when
connected to line voltage. After
disconnecting from the line wait at least 20 minutes for
200 and 400 V units (VLT 4452-4652: Wait at least 40
minutes) and 30 minutes for 525-600 V units before
touching any electrical components. Also make sure
that other voltage inputs have been disconnected,
such as external 24 VDC, load-sharing (linkage of DC
intermediate circuit), as well as the motor connection for
kinetic back-up. Only a competent electrician should
carry out the electrical installation. Improper installation
of the motor or the VLT may cause equipment failure,
serious injury or death. Follow this manual and National
Electrical Codes (NEC ) and local safety codes.
MG.40.A7.22 - VLT is a registered Danfoss trademark
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