Pressure Filtering - Sub Parameter Regulation for Superheat: Self Adaptive or Manual Operating Mode • 27
16 Regulation for
Superheat: Self
Adaptive or
Manual
Operating Mode
16.1.Pressure Filtering - Sub
Parameter
For optimal SH regulation, use a filtered value of
pressure. This can be accomplished by using the
parameter Sub.
Suggested values:
• From 1-5 evaporators for each racks: Sub = 20
• From 6-30 evaporators for each racks: Sub = 15
• More than 30 evaporators for each racks: Sub =10
16.2.General Considerations
The controller can regulate the superheat in manual or
self adaptive mode, according to the value of the
parameter AMS, auto-tuning enabling.
•With AMS = n: the normal SH regulation is
performed.
•With AMS = y: the self adaptive SH regulation is
performed.
16.3. Manual Operating
Mode - AMS = NO
The temperature and SH regulation can be performed
in two ways, according to the value of the parameter
CrE: on/off or continuous. See the Standard
temperature regulation in details below.
LSt
Minimum number of steps: (0 to USt)
Allows selection of the minimum number of
steps. At this number of steps, the valve should
be closed. Read the manufacturer’s data sheet to
set this parameter correctly.Configure the value
of this parameter within the allowed range of
functioning.
CAUTION! Changing this parameter will
require a valve restart.When the programming
mode ends, the controller will automatically
restart.
USt
Maximum number of steps: (LSt t
o
800*10)
Allows the user to select the maximum number
of steps. At this number of steps, the valve
should be opened completely. Read the
manufacturer’s data sheet to set this parameter
correctly. Configure the value of this parameter
within the allowed range of functioning.
CAUTION! Changing this parameter will
require a valve restart.When the programming
mode ends, the controller will automatically
restart.
Est
Extra step during closing phase: (0 to 255
(*10)) it sets the number of extra steps the
controller performs, when the valve is closed at
start up, and during the pauses of regulation, to
force the closure of the valve.
Note: To set the ESt, the following steps has to be
done:
1. Set the kind of valve by the parameter tEP.
This pre-set the parameters related to the valve
2. Set the right value of ESt.
Sr
Step rate: (10 to
600 step/sec)
The maximum speed to change step without
losing p
recision (losing steps). It is
recommended to set this parameter below the
maximum speed.
CPP
Current per phase (only for
bipolar valves):
(0 to 100*10mA)
The maximum current per phas
e used to drive
the valve. (Used only with bipolar valves)
CHd
Holding curre
nt per phase (only fo
r
bipolar
valves): (0 to 100*10mA)
The current per phase when the valve is stopped
for m
o
re than 4 minutes. (Used only with
bipolar valves)
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