Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
331/346
Version no.
Description
1.1.0.4
For all reciprocating compressors, timer 15
Oil temperature low
is made adjustable [0 -
300] seconds, with unchanged default value (300 sec.) If the
Oil temperature low
timer
is set to 0 seconds, then the shutdown/alarm monitoring is always active.
For all reciprocating compressors, settings for the following oil return timers have been
adjusted:
Oil return
,
Oil return open
,
Oil return close
and
Oil return delay
.
An error when using UniSAB III for Ex use has been corrected. The
Evolution
commu-
nication was disabled (reset to no) if control
Mode
was changed which resulted in the
connection between UniSAB III and a PLC/Ex keyboard being lost. This error is not
found in version 1101.
A problem which sometimes made the heating element digital output flicker has been
corrected. The problem with flickering (DO20 quickly switching between on/off) could
arise when the Profibus Extended protocol was used and compressor start or stop by
Profibus was used and command was set constantly. The PLC code should only set a
start or stop command as a pulse with an approximate length of 1 sec. This was how-
ever not stated in the Profibus Extended manual. The UniSAB III code is now made
more PLC/Profibus compliant:
•
After a compressor start command, 5500h have been executed, and the com-
pressor is started, UniSAB will ignore a start command.
•
After a compressor stop command, 0055h have been executed, and the com-
pressor is stopped, UniSAB will ignore a stop command.
A data value was missing in the CSV file sent to the Smartphone App. The
Low shut-
down
for
Oil Separator temperature
has now been added.
For SAB 157 HR, the plug valve logic for
low main oil pressure
has been corrected.
Main oil pressure logic now unloads the plug valve when the main oil injection port
SM1 is active.
The sequencing has been modified so the
Compressor State
does not shift to “Running
Overload” when the plug valve is unloaded. The “Low main oil pressure” alarm delay
has been changed from 600 seconds to 180 seconds.
For SAB 157 HR, the "Oil pump safety" logic did not work properly. The displayed pump
pressure did not update and alarm and shutdown functionalities were not working. This
has now been corrected.
For SABflex, the calibration of
Suction internal pressure
, AI P6, was not possible. A
new calibration value
Internal Adjustm.
has been added as parameter #5 in the calibra-
tion menu.
For SABflex, the capacity increase output DO10 was flickering when Danfoss commu-
nication was chosen (Drive Com = DA), and the capacity was in 100%. This has now
been corrected.
For SABflex, when
Oil pump
was configured as demand pump, the oil pump was
started 1 second before the compressor motor start command was issued. This has
now been corrected, i.e. the oil pump does not start before the compressor is running.
Summary of Contents for SABROE Unisab III Control
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