quickly impact and damage the electronics. In these areas,
cabinet fitting with fresh-air circulation in the cabinet is
recommended, thereby ensuring that aggressive gases are
kept away from the frequency converter.
CAUTION
Fitting of frequency converters in aggressive
environments increases the risk of stoppages, in addition
to considerably reducing the service life of the unit.
Before installing the frequency converter, ensure there are
no liquids, particles, or gases in the air by looking at
existing installations in the same environment. Typical
indicators of harmful airborne liquids are water or oil on
metal parts or corrosion of metal parts. Too many dust
particles are typically observed on top of installation
cabinets and on existing electrical installations. Indicators
that there are aggressive gases in the air are copper rails
and cable ends that are black on existing electrical instal-
lations.
5.2 Display and Messages
5.2.1 Display Readout
Fr
The frequency converter shows the present output
frequency in Hertz [Hz].
Io
The frequency converter shows the present output current
in Amps [A].
Uo
The frequency converter shows the present output voltage
in Volt [V].
Ud
The frequency converter shows the intermediate circuit
voltage in Volt [V].
Po
The frequency converter shows the calculated output in
kilowatt [kW].
notrun
This message is shown if an attempt is made to change a
parameter value while the motor is running. Stop the
motor to change the parameter value.
LCP
This message is shown if an LCP 2 control unit is fitted and
the [QUICK MENU] or [CHANGE DATA] key is pressed. If an
LCP 2 control unit is fitted it is only possible to change
parameters with LCP 2.
Ha
The frequency converter shows the present Hand mode
reference frequency in Herz (Hz).
SC
The frequency converter shows scaled output frequency
(the present output frequency x parameter 008).
5.2.2 Warnings and Alarm Messages
A warning or an alarm appears in the display as a
numerical code
Err. xx
. A warning is shown in the display
until the fault has been corrected, while an alarm
continues to flash until the [STOP/RESET] key is pressed.
shows the various warnings and alarms, and
whether the fault locks the frequency converter. After a
Trip lock
, the mains supply is cut off and the fault is
corrected. The mains supply is reconnected and the
frequency converter is reset. The frequency converter is
now ready. A
Trip
can be reset manually in 3 ways:
•
Via the operating key [STOP/RESET].
•
Via a digital input.
•
Via serial communication.
It is also possible to select an automatic reset in
parameter
405 Reset function
. When a cross appears in both warning
and alarm, this can mean that a warning comes before an
alarm. It can also mean that it is possible for the user to
programme whether a warning or an alarm appears for a
given fault. For example, this is possible in
parameter 128
Motor thermal protection
. After a trip, the motor coasts, and
alarm and warning blink on the frequency converter, but if
All about VLT 2800
Design Guide
136
Danfoss A/S © Rev. May/2014 All rights reserved.
MG27E402
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