AMU Use
20
the motor being tested and are indications of faults caused by incorrect connections to the
motor, the supplied line voltage and/or motor currents being outside the specified limits
and other conditions that
prevent AMU from correctly
determining the state of the
motor. Alarms do not cause
AMU to stop monitoring
completely, but generally are
indications that there is something that needs to be investigated and possibly changed
before AMU can function to its full extent. In some cases an alarm may indicate a transient
event such as high line voltages, which although damaging to the motor in the long term,
do not indicate an immediate need for action. Of course if the frequency of such events is
sufficiently high, the cause should be located and corrective action taken to remedy the
problem.
It is important to realize that when an alarm is
displayed, AMU does not process the data taken from
current and voltage channels. Therefore AMU cannot
monitor the motor status.
It is therefore important to ascertain the cause of the alarm at the earliest opportunity (See
Section 7.1.2 in Appendix 1).
3.4.2.2. Viewing alarm messages
An alarm is indicated on the front panel of AMU by the message Alarm followed by a
hexadecimal value. The bits of the hexadecimal value refer to which alarm is raised
repeatedly pressing the RIGHT or LEFT buttons cycles through a list of all active alarms.
Please refer to the appendix for a complete list of possible alarm conditions and their
remedies. The measured physical motor values can be viewed during an alarm by pressing
the UP or DOWN buttons. This is often useful in determining the reason for an alarm.
When monitoring a motor in test mode (MONITOR, IMPROVE or UPDATE), AMU provides a
status indication on the right side of the upper display line. This consists of one of the items
in the table above.
A prolonged fault indication should always be
investigated.
To Next Page
Loading...