Display Indications (Reciprocating Compressors) - Johnson Controls SABROE UniSAB III Engineering Manual

Compressor control and surveillance
1) Only shown while capacity is limited.
2) If limiter is active (suction pressure > alarm limit), it will remain active until the pressure falls below the
alarm limit less 2°C/R.
3) Limiter is not active or passive like standard limiters. It actively limits capacity so that it is less than or
equal to the selected High limit.
3.2.5

Display indications (reciprocating compressors)

The following table shows the display texts for limiters.
Limiter
Low suction pressure
High discharge pressure
High motor current
Low brine temperature
High water temperature
High differential pressure
High suction pressure
Suction ramp
High discharge
temperature
High liquid level
High suction pressure
gradient
Table 28: Display indications - reciprocating compressors
1) Only shown while capacity is limited.
2) If limiter is active (suction pressure > alarm limit), it will remain active until the pressure falls below the
alarm limit less 2°C/R.
3) Limiter is not active or passive like standard limiters. It actively limits capacity so that it is less than or
equal to the selected High limit.
4) Limiter is active as long as the liquid level is high. When the liquid level gets low, limiter is passive until
the delay timer runs out.
Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
Overview picture indication
Compressor Compressor
stopped running
Standard Limiters:
Pause Suction lim.
Pause Discharge lim.
Irrelevant Running
overload
Pause Suction lim.
Pause Discharge lim.
Irrelevant Discharge lim.
Special limiters:
Ready Suction lim. 1)
Irrelevant
Suction lim.
Irrelevant Irrelevant
Irrelevant Irrelevant
Irrelevant Irrelevant
101/346
Alarm picture,
Passive
Active indication
indication
None Suction pressure
None Discharge pressure
None
Limiting brine Brine temperature
temperature low lim. and limiting
brine temperature
Limiting hot water Brine temperature
limiting hot water
None High differential
None 2) 3) Suction pressure
None
None Limiting discharge
High liquid level 4) High liquid level 4)
None High suction pres-
Alarm picture,
low lim.
high lim.
None
high lim. and
pressure
high lim. 3)
None
temperature
sure gradient