3.2.4 Display indications (screw compressors)
The following table shows the display texts for the 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. Limiting suction
pressure
Suction pressure
low lim.
High discharge pressure Pause Discharge
lim.
Limiting discharge
pressure
Discharge pres-
sure high lim.
High motor current Irrelevant Running
overload
None None
High motor power Ready Running
overload
None None
Low brine temperature Pause Suction lim. Limiting brine
temperature and
Limiting suction
pressure
Brine temperature
low lim. and
limiting brine tem-
perature
High water temperature Pause Discharge
lim.
Limiting hot
water and
limiting discharge
pressure
Brine temperature
high lim. and
limiting hot water
High differential pres-
sure
Irrelevant Irrelevant Irrelevant Irrelevant
Special limiters:
High suction pressure Ready Suction lim.
1)
None 2) 3) Suction pressure
high lim.
High motor torque
(current)
Ready Running
overload
None None
High internal suction
pressure
Ready Running
overload
None High internal
suction pressure
Low oil pressure Ready Running
overload
None Low oil pressure
Start-up limiter Ready Running
overload
None High suction press
and/or
Low oil pressure
Suction ramp Irrelevant Suction lim. Limiting suction
pressure
Irrelevant
High discharge
temperature
Irrelevant Irrelevant Irrelevant Irrelevant
Separator velocity Irrelevant Running
overload
High separator
flow
High separator
flow
Insufficient main
oil pressure
Irrelevant Running
overload
Low main oil pres-
sure
Low main oil
pressure
Forced speed Irrelevant Irrelevant None Forced speed
active
Table 26: Display indications - screw compressors
Compressor control and surveillance
94/319
Engineering manual - Unisab III 1.10
001930 en 2014.09
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