Danfoss VLT AAF006, Service Manual

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2 Operator Interface and Active Filter Control
2.1 Introduction
The advanced active filter (AAF) monitors external and
internal harmonic current conditions. When an alarm is
issued and the filter trips, it cannot be assumed that the
fault lies within the active filter itself. Most alarms that the
AAF displays are generated by conditions outside of the
active filter. This service manual provides techniques and
test procedures to isolate a fault condition whether within
or outside of the active filter.
Active filters have protection circuitry that reduces the
filter output current. If the reduced output is insufficient,
or in critical situations, a fault is registered and the unit
will trip - suspend operation - to avoid damage. When a
fault occurs, a fault message is displayed to assist in
troubleshooting and service. The normal operating status
of the filter is displayed in real-time on the LCP display.
Virtually every filter operation results in an indication on
the LCP display. Fault logs are maintained within the active
filter for fault history.
The filter also shows warnings on the LCP display to
indicate that the unit has reached a given limit. In most
cases, the AAF automatically adjusts to assure operation is
not disrupted. Warnings usually indicate that the filter is
running at its maximum capability. Familiarity with the
information provided on the display is important.
Diagnostic data can be accessed through the LCP.
2.2 User Interface
The local control panel (LCP) is the combined display and
keypad on the front of the unit. The LCP is the user
interface to the active filter.
The LCP has several user functions.
•
Start and stop the filter when in local control
•
Display operational data, status, warnings and
cautions
•
Programming active filter functions
•
Manually reset the active filter after a fault when
auto-reset is inactive
2.2.1 LCP Layout
The LCP display is divided into three functional groups
(see
Figure 2.1 ).
On
Warm
Alarm
OK
Status
Quick
Menus
Main
Menu
Alarm
Log
Status
1(1)
0.0% 0.0% 0˚C
111A
0A
Auro Running
a
b
c
130BB468.10
Auto
on
Hand
on
Off Reset
Figure 2.1 LCP Display
a. Display mode line shows which display mode is
active and indicates which set up is active and
how many set ups are programmed 1(1). Pressing
[Status] changes modes.
b. Lines 1 - 3 display user selected operation data
(see
2.2.2 Setting LCP Display Values ).
c. Status line displays filter-generated status
messages (see
2.3.1 Status Messages ).
Operator Interface and Acti... VLT Advanced Active Filter AAF006 D and E Frames Service Manual
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