Compressor Experiencing A Failure - Emerson VILTER MicroVission Operation And Service Manual

Appendix D • Compressor Sequencing Setup

Compressor Experiencing a Failure

When compressor experiences an operational failure,
then that compressor will be temporarily skipped dur-
ing the sequencing decisions. The compressor will be
placed into a "Local" mode. The fault needs to be reset
and cleared before the compressor can be placed back
into the sequencing routine. The compressor can be put
back into seq standby mode for sequencing by pressing
Auto Start->Auto Seq again on the compressor. It will re-
sume its "set" priority order and any future command to
increase load of compressor will result in the compressor
being restarted.
1. Compressor experiencing a Failure
When the compressor experiences an operational failure
then that compressor will be temporarily skipped during
the sequencing decisions. The failure messages will be
logged into compressor sequencing log reference Figure
D-7.
Failure Type:
• Communication Error / Power to compressor is
turned off: If the power to the compressor is turned
off/ TCP communication failed, then the compres-
sors that are currently being sequenced will experi-
ence a "TCP Comm Error" – an indication that the
compressor has lost communication to the other
MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.3
Figure D-7. Compressor Sequencing Log
compressors. This takes approximately 1 minute to
occur and the "TCP Comm Error" message will be
logged into the comp sequencing log on the com-
pressors. Once Communication Error is detected
then compressor will be placed in local auto if it is
running in auto seq.
• Trip: If compressor is stopped due to trip condition,
then "Trip on Compressor" message will be logged
into the comp sequencing log on the compressors.
• Stop Load / Force Unload conditions: If compres-
sor is having stop load/ force unload condition,
then "Stop Load on Compressor"/ "Force Unload on
Compressor" message will be logged into the comp
sequencing log on the compressors.
• Compressor Sequencing Control Mode Changed:
If compressor sequencing control mode is dif-
ferent than active control mode in Compressor
Control Screen, then "Control Mode Changed on
Compressor" will be logged into the comp sequenc-
ing log . Once Compressor Sequencing Control Mode
Changed Error is detected then compressor will be
placed in local auto if it is running in auto seq.
• Priority set to Zero: If priority of compressor is set to
zero, then compressor will be considered out of se-
quence. Compressor will be placed in local auto if it is
running in auto seq.
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