2 MG.30.A7.02 - VLT
®
is a registered Danfoss trademark
Electrical safety
The frequency converter contains
dangerous voltages when connected
to the mains. Improper connection of
the motor or frequency converter may
cause equipment failure, serious in-
jury or death.
Therefore follow the directions in this
manual, as well as local and national
safety codes.
Touching the electrical parts, even
when the power supply has been
switched off, can cause serious injury
or death.
When using VLT
®
3002-3052:
Wait 4 minutes.
When using VLT
®
3060-3250:
Wait 14 minutes.
Warning
These rules concern
your safety
1. When repairs are undertaken, the mains
supply to the VLT
®
must be disconnected.
2. The “Stop/Reset” key on the frequency
converter’s keyboard 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 incorpor-
ate protection against motor overload.
For this function parameter 315 is set
at data value
“trip”
[2] or data value
“warning”
[1].
Note:
This function is initialised at 1.16 x rated
motor current (parameter 107).
Warning against
improper start
1. The motor can be stopped using di-
gital 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 unin-
tended start, these stops will not be
sufficient.
2. The motor can start during parameter
operation. Therefore always activate
the ”Stop/Reset” key, after which
data can be changed.
3.
A stopped motor can start if a fault
occurs in the frequency converter’s
electronics or after a temporary
overload, mains fault or faulty motor
connection.
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.
For the
North American
market
The Electronic Thermal Relay (ETR) in UL listed VLT
®
's provides class 20 motor
overload protection in accordence with NEC in single motor applications, when
parameter 315 is set for "TRIP" and parameter 107 is set for nominal motor
rated (nameplate) current. Effective from software version 1.10.
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