2 Operator Interface and Control
2.1 Introduction
Frequency converters are designed with self-diagnostic
circuitry to isolate fault conditions and activate display
messages which greatly simplify troubleshooting and
service. The operating status of the frequency converter is
displayed in real-time. Virtually, every command given to
the frequency converter results in some indication on the
local control panel LCP display. Fault logs are maintained
within the frequency converter for fault history.
The frequency converter monitors supply and output
voltages along with the operational condition of the motor
and load. When the frequency converter issues a warning
or alarm, it cannot be assumed that the fault lies within
the frequency converter itself. In fact, for most service calls,
the fault condition will be found outside of the frequency
converter. Most of the warnings and alarms that the
frequency converter displays, are generated by response to
faults outside of the frequency converter. This service
manual provides techniques and test procedures to help
isolate a fault condition whether in the frequency
converter or elsewhere.
Familiarity with the information provided on the display is
important. Additional diagnostic data can be accessed
easily through the LCP.
2.2 Operating the Frequency Converter
2.2.1 Operation and Programming Through
the LCP
The combined display and keypad on the front of the unit
is the local control panel (LCP). The LCP is the user
interface to the controller.
The LCP has several user functions: to start, stop, and
control motor speed when in local control along with
displaying operational data, warnings and cautions, as well
as programming controller functions, and to manually
reset the controller after a fault when auto-reset is inactive.
2.2.2 Local Control Panel (LCP)
The LCP is divided into four functional groups (see
Illustration xxx):
1.
LCD display area
2.
Menu display keys for status options,
programming, and error message history
3.
Navigation keys for programming functions,
moving the display cursor, and speed control in
local operation (along with status indicator lights)
4.
Operation mode keys and reset
Operator Interface and Cont...
High Power Service Manual for Modular F Frame Drives
36
MG90K202 - VLT
®
is a registered Danfoss trademark
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