Johnson Controls SABROE UniSAB III User Manual

Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
145/346
Compressor control and surveillance
3.6 Compressor control - chiller functions
Please note that when using the chiller functions described in this section there are certain limitations in
the use of some of the other UniSAB III functions, e.g. oil cooling functions.
• When the chiller function Level control LP/HP or Expansion control DX is used it is not possible
to use the By-pass function - and vice versa.
• When the chiller function Level control LP/HP or Expansion control DX or the By-pass function
is used it is only possible to use the following two oil cooling functions:
– Water cooling for reciprocating compressors
– Intermediate liquid injection for two step reciprocating compressors
All other Oil cooling functions are blocked and cannot be used.
• When the chiller function Flow condenser is used it is not possible to use the Cap down blocked
function - and vice versa.
• When the new Thermo pump - internal function is used it is only possible to use the chiller func-
tions Oil return from oil separator and Flow condenser.
Chiller function
configured
Used I/O
Other functions using these I/O
Process out temp.
AI6
Process in temp.
AI5
Oil return from oil separator
DO19
Oil return from evaporator
DI13
DO18
Thermo pump - internal (recip.)
Oil return (recip.)
Oil rectifier (screw)
By-pass function
(or level control LP/HP)
(or expansion control DX)
DO16
Oil cooling - normal (screw/recip.)
Thermo pump - external (recip.)
Thermo pump - internal (recip.)
Dual 4-20 mA HLI valve (screw)
HLI - AKV stop valve (screw)
Motor valve (screw)
Flow evaporator
DI12
Thermo pump - internal (recip.)
Flow condenser DI11
Cap down blocked
Liquid level limiter
DI5
Filter diff. pressure
Level control LP/HP
Expansion control DX
DO016
AI3
AO2
See By-pass function
Table 32
3.6.1 Process out temp.
Display and monitor the analogue input Process out temperature in the picture Control values/Process
temp/Process out temp/Values.
Alarm and shutdown supervision settings are made in the picture Control values/Process temp/Process
out temp/Limits.
The PID regulator settings for compressor capacity regulation are made in the picture Control values/
Process temp/Process out temp/Control. This function is enabled in Set-up/Configuration/Plant/Proces
out temp. Monitoring is always active and the PID regulator is active when the compressor is running.
3.6.2 Process in temp.
Display and monitor the analogue input Process in temperature in the picture Control values/Process
temp/Process in temp/Values.

Johnson Controls SABROE UniSAB III Specifications

General

Brand	Johnson Controls
Model	SABROE UniSAB III
Category	Control Systems
Language	English