Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
165/346
Service
Main service C (recip and screw not supporting LLC automatic service)
The calculated estimated number of running hours between the two main services C. If manual service
is selected, Main service C is set equal to Service interval C. If automatic service is selected, Main serv-
ice C is calculated on the basis of how the compressor has been operating since last main service, i.e.
discharge pressure, suction pressure, rotating speed and the number of starts/s tops.
Next main service C (recip and screw not supporting LLC automatic service)
This is the calculated estimated number of running hours until the compressor needs the next main serv-
ice C. This service interval is calculated as Main service C minus the running hours since last service C.
Next sub-service B (recip not supporting LL service and screw not supporting LLC automatic
service)
This is the calculated estimated number of running hours until the compressor needs the next service B.
If next sub-service B is scheduled to be performed at the same time as the Main service, the sub-service
B will not be shown. The service B hour field will be blank, i.e. “–”. This sub-service interval is calculated
as Main service C / 2 minus the running hours since last service B.
For reciprocating compressors supporting Long Life service, e. g. SMC Mk 5, the sub-service B is re-
placed with a sub-service A.
Next sub-service A (recip and screw not supporting LLC automatic service)
This is the calculated estimated number of running hours until the compressor needs the next service A.
If next sub-service A is scheduled to be performed at the same time as the Main service or the sub-serv-
ice B, the sub-service A will not be shown. The service A hour field will be blank, i.e. “–”.
For screw compressors, this sub-service interval is calculated as Main service C / 6 minus the running
hours since last service A.
For reciprocating compressors, this sub-service interval is calculated as Main service C / 4 minus the
running hours since last service A.
Starts since main
Counts the number of compressor starts since last main service C or D, i.e. since the last acknowledge
for a main service C or D alarm.
Automatic service
Choose between Manual service and Automatic service interval calculation.
If Automatic service is set to No you must manually enter a fixed value for the Service interval C or D.
The default value is 30,000 hours.
If Automatic service is set to Yes, UniSAB III will automatically calculate the optimum Service interval C
or D between main services depending on the compressor running conditions.
The calculation for the Service intervals C or D is based on the following measurements:
• Compressor load condition, i.e. suction pressure and discharge pressure
• Compressor speed, i.e. the actual variable speed or fixed speed
• Number of starts (SABCube only)
See your compressor service manual for more information about the load curves used for the optimum
Service interval calculation.
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