Engineering manual - UniSAB III 1.10.8
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001930 en 2021.06
13: Rota Recip
Step (Applicable for Centa coupling and for Rexnord coupling – if resonance frequencies are skipped)
Speed (Applicable only for Centa coupling)
Select the
Step method
to use the standard Rota control method for reciprocating compressors. For
some compressor types it is possible to set and operate with a low minimum rpm value under part load.
See subsection
for more information.
Select the
Speed method
to be used on reciprocating compressors equipped with VSD and the soft
Centa coupling. It is not recommended for reciprocating compressors equipped with the standard Re-
xnord coupling, as it may lead to torsional vibration problems. For some compressor types it is possible
to set and operate with a low minimum rpm value under part load.
The
Speed
configuration is not applicable for TCMO and TSMC reciprocating compressors.
See subsection
for more information.
14: Motor rpm min. 2
500 to 1000 rpm for SMC reciprocating compressors
700 to 1000 rpm for CMO reciprocating compressors
Enter the minimum rpm 2 value which may be used in combination with the minimum rpm value when
running the
Step
or
Speed
configuration. When more than half of the steps are engaged a higher mini-
mum speed 2 is used. This higher minimum speed is necessary to maintain proper motor fan cooling for
standard motors at a higher load than 50%. See subsection
for more information.
For SMC/HPC/TSMC with frequency drive it is possible to set the minimum limit for
Motor rpm min 2
to
500 rpm. The default setting remains at 700 rpm.
For CMO/HPO/TCMO with frequency drive it is possible to set the minimum limit for
Motor rpm min 2
to
700 rpm. The default setting remains at 900 rpm.
Summary of Contents for SABROE Unisab III Control
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