Application - ABB RELION REX640 Technical Manual

1MRS759142 C
6.6.5
REX640
Technical Manual
increasing from the previous value. The count of OPR_TIME saturates at the final
value of 299999, that is, no further increment is possible. The activation of RESET can
reset the count to the Initial value setting.
Limit supervision
This module compares the motor run-time count to the set values of Warning value
and Alarm value to generate the WARNING and ALARM outputs respectively when the
counts exceed the levels.
The activation of the WARNING and ALARM outputs depends on the Operating time
mode setting. Both WARNING and ALARM occur immediately after the conditions are
met if Operating time mode is set to "Immediate". If Operating time mode is set to
"Timed Warn", WARNING is activated within the next 24 hours at the time of the day
set using the Operating time hour setting. If Operating time mode is set to "Timed
Warn Alm", the WARNING and ALARM outputs are activated at the time of day set
using Operating time hour.
The Operating time hour setting is used to set the hour of day in
Coordinated Universal Time (UTC). The setting has to be adjusted
according to the local time and local daylight-saving time.
The function contains a blocking functionality. Activation of the BLOCK input blocks
both WARNING and ALARM.

Application

The machine operating time since commissioning indicates the use of the machine.
For example, the mechanical wear and lubrication requirement for the shaft bearing of
the motors depend on the use hours.
If some motor is used for long duration runs, it might require frequent servicing, while
for a motor that is not used regularly the maintenance and service are scheduled less
frequently. The accumulated operating time of a motor together with the appropriate
settings for warning can be utilized to trigger the condition based maintenance of the
motor.
The operating time counter combined with the subsequent reset of the operating-time
count can be used to monitor the motor's run time for a single run.
Both the long term accumulated operating time and the short term single run duration
provide valuable information about the condition of the machine and device. The
information can be co-related to other process data to provide diagnoses for the
process where the machine or device is applied.
Section 6
Supervision functions
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