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.
Overview picture indication
Limiter
Compressor
stopped
Compressor
running
Alarm picture,
Passive
indication
Alarm picture,
Active indication
Standard Limiters:
Low suction pressure Pause Suction lim. None Suction pressure
low lim.
High discharge pressure Pause Discharge
lim.
None Discharge pres-
sure high lim.
High motor current Irrelevant Running
overload
None None
Low brine temperature Pause Suction lim. Limiting brine
temperature
Brine temperature
low lim. and limit-
ing
brine temperature
High water temperature Pause Discharge
lim.
Limiting hot water Brine temperature
high lim. and
limiting hot water
High differential pres-
sure
Irrelevant Discharge
lim.
None High differential
pressure
Special limiters:
High suction pressure Ready Suction lim.
1)
None 2) 3) Suction pressure
high lim. 3)
Suction ramp Irrelevant Suction lim. None None
High discharge
temperature
Irrelevant None None Limiting discharge
temperature
Table 27: 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.
Compressor control and surveillance
Engineering manual - Unisab III 1.10
001930 en 2014.09
95/319
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