Johnson Controls SABROE Unisab III Control User Manual

When the compressor is equipped with VSD and the soft Centa coupling one of the following
unloading functions must be chosen:
• VSD normal – see subsection 6.4.3. Compressor block.
• VSD total – see subsection 6.4.3. Compressor block.
Additional unloading is not available with Centa coupling.
Table 28 shows SMC VSD cylinder unloading with the Centa coupling. Percentages shown are
the capacity at maximum speed.
Cylinders 2 4 6 8 10 12 14 16
Compressor
SMC/HPC 104
Digital output DO09
100%
1
DO10
SMC/HPC 106
Digital output DO09 DO10
100%
1
DO11
SMC/HPC 108
Digital output DO09
50%
2
DO10
TPV (1)
DO11
100%
1+2
+DO12
TSMC 108
Digital output -
33%
2
DO09 DO10
100%
1+2
+DO11
SMC 112
Digital output - DO9
50%
2
DO10
TPV (1)
DO11 DO12
100%
1+2
+DO13
SMC 116
Digital output -
25%
4
DO09 DO10
50%
3+4
+DO11
TPV
(1+2)
DO12
75%
2+3+4
+DO13 DO14
100%
1+2+3+4
+DO15
TSMC 116 *)
Digital output
-
17%
4
DO09 -
50%
3+4
+DO10
-
67%
2+3+4
TPV
(2HP)
+DO11 DO12
100%
1+2+3+4
+DO13
Table 28: SMC VSD cylinder unloading configuration with Centa coupling
The digital output and solenoid valves which must be activated to provide capacity control are
emphasised with bold letters.
The Thermo Pump TPV connection for the high cylinder part is also shown in Table 28. The
TPV connection has not been changed - it is the same as for the standard compressor.
*) Note that on a standard TSMC 116 compressor, output DO09 will correspond to 33% (4+2
cylinders). With VSD unloading, DO09 will correspond to 17% (2+2 cylinders).
Compressor control and surveillance
Engineering manual - Unisab III 1.10
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Johnson Controls SABROE Unisab III Control Specifications

General

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