MG.20.B6.02 – VLT is a registered Danfoss trademark
VLT
®
2000 Series
4
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Safety rules
Warning against improper start
1. The motor can be stopped using digital commands,
bus commands, references or local stop, while the
frequency converter is connected to the mains.
If personal safety requires elimination of any
possibility of unintended start, these stops will not
be sufficient.
2. The motor can start during parameter operation.
Therefore always activate the “Stop/Reset” key
before changiing data.
3. A stopped motor can start if a fault occurs in the
electronics of the frequency converter or after a
temporary overload, mains fault or faulty motor
connection.
For the North American market
CAUTION: It is the responsibility of the user or person
installing the drive to provide proper grounding and
branch circuit protection for incoming power and motor
overload according to National Electrical Codes (NEC)
and local codes.
The Electronic Thermal Relay (ETR) in UL listed VLTs
provides class 20 motor overload protection in
accordance with NEC in single motor applications,
when parameter 315 is set to
Trip
[2] and parameter
107 is set to nominal motor (nameplate) current.
The frequency converter contains dangerous
voltages when connected to the mains.
Improper connection of the motor or the frequency
converter may cause equipment failure, serious injury
or death.
Therefore follow the directions in this manual, as well as
local and national safety rules.
Touching the electrical parts, even when the power
supply has been switched off, can cause serious injury
or death.
Wait at least 4 minutes after switching off before
touching any electrical parts.
These rules concern your safety
1. When repairs are undertaken the power supply to
the frequency converter must be disconnected.
2. The “Stop/Reset” key on the keyboard of the
frequency converter does not disconnect the power
supply and may therefore not be used as a safety
switch.
3. The unit must be properly grounded, the user must
be protected against supply voltage and the motor
against overload according to national and local
codes.
4. The leakage currents to ground are higher than
3 mA.
5. The factory setting does not incorporate protection
against motor overload. For this function parameter
315 is set to data value
Trip
[2] or data value
Warning
[1]. Note: This function is initialised at
1.16 x rated motor current and rated motor
frequency (see page 63).
6. Do not remove the motor and mains terminals,
when the unit is connected to the mains. Ensure
that the power supply has been switched off,
before you remove the motor and mains terminals.
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