Engineering manual - UniSAB III 1.10.8
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001930 en 2021.06
regulate up to, and stay at, a minimum speed of 3000 rpm for the first 60 seconds after compressor
start.
Note that a function for controlling an electrical motor cooling fan may need to be enabled for screw
compressor types when Rotatune is set to Yes. If you have an electrical cooling fan on the motor then
connect it to the appropriate terminals on plug X12 and X3 in UniSAB III.
From software version 1.1.0.5, Motor fan control is made configurable when Rotatune is set to Yes, see
subsection
6.4.1 Drive, 12: Motor Fan.
Up to software version 1.1.0.4 motor fan control was automatically enabled when Rotatune was set to
Yes. In this case, if you do not have any electrical cooling fan on the motor then mount jumpers between
the
Fan start signal output
in X12 and the
Fan running feedback input
in X3 to avoid a shutdown mes-
sage for missing
Fan motor feedback
.
7: Drive Com
AO/LS/DA
Select
AO
if UniSAB III is fitted on a compressor with frequency converter and this converter is speed
controlled through the 4-20mA analogue output AO3.
Select
LS
if UniSAB III is fitted on a compressor with a Leroy Somer frequency converter, type Modular
Drive York, and this converter is speed controlled through the Modbus RTU protocol on RS485 port 2.
For now, this setting may only be used for SABCube. The setting will enable the
VSD
menu, see subsec-
tion
for further information.
Select
DA
if UniSAB III is fitted on a compressor with a Danfoss frequency converter, type FC100, and
this converter is speed controlled through the Modbus RTU protocol on RS485 port 2. For now, this set-
ting may be used for SABflex and SABCube only.
This setting will enable the
VSD
menu, see subsection
for further information.
8: Motor rpm min
500-1000 rpm for SMC reciprocating compressors
700-1000 rpm for CMO reciprocating compressors
0 to 12,000 rpm for screw compressors
Enter the minimum rpm value to be displayed corresponding to a 4 mA analogue output signal to the fre-
quency converter. The frequency converter must be configured to minimum permissible frequency. See
the converter user manual and list of settings for details. See also the UniSAB III sequence manual,
which describes the use of frequency converters with UniSAB III. For SAB HR compressors, enter the
value in rpm corresponding to minimum frequency in the frequency converter.
9: Motor rpm max
1100 to 1800 rpm for SMC reciprocating compressors
1100 to 1800 rpm for CMO reciprocating compressors
0 to 12,000 rpm for screw compressors
Enter the maximum rpm value to be displayed corresponding to a 20 mA analogue output signal to the
frequency converter. The frequency converter must be configured to maximum permissible frequency.
See the converter user manual and list of settings for details. See also the UniSAB III sequence manual,
which describes the use of frequency converters with UniSAB III. For SAB HR compressors, enter the
value in rpm corresponding to maximum frequency in the frequency converter.
10: Forced speed
0 to 12,000 rpm
Enter the forced speed value between the configured values for
motor rpm min.
and
motor rpm max.
For
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