that the drive would 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 a motor cooling fan automatically is 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.
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
message 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 subsection 6.4.2. VSD 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 setting may be used for SABflex only.
This setting will enable the VSD menu, see subsection 6.4.2. VSD for further information.
8: Motor rpm min
500 to 1000 revolutions/minute - for recips
0 to 12,000 revolutions/minute - for screws
Enter the minimum rpm value to be displayed corresponding to a 4 mA analog output signal
to the frequency converter. The frequency converter must be configured to minimum permis-
sible 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 revolutions/minute - for recips
0 to 12,000 revolutions/minute - for screws
Enter the maximum rpm value to be displayed corresponding to a 20 mA analog output signal
to the frequency converter. The frequency converter must be configured to maximum permis-
sible 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 revolutions/minute
Enter the forced speed value between the configured values for motor rpm min. and motor
rpm max. For SAB 120, 151, 157HR, 193, 233, 283 and 355 with frequency converter Unisab
III will quickly increase the speed in the frequency converter up to the “forced speed” rpm
value entered here.
Set-up
Engineering manual - Unisab III 1.10
001930 en 2014.09
177/319
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