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6.6.9
Summary of inputs, outputs and HPV valve par.
The following is a summary table of the inputs/outputs used and the
parameters with indications of the related confi guration screens. For
details, refer to Appendix A.1.
Summary of inputs/outputs and HPV valve parameters
Mask
Analog inputs
Bab04, Daa39 Gas cooler pressure
Bab61, Daa43 Gas cooler output temperature
Bab09, Daa40 Gas cooler backup pressure
Bab62, Daa44 Gas cooler output backup temperature
Digital inputs
Baade, Eia04
Analog outputs
Bad14, Eia06
Digital outputs
---
Parameters
Settings
Eib01
HPV valve management enabled, or transcritical
operation mode enabled
Selecting the type of algorithm to apply to the
calculation of the pressure setpoint
Zone
Eib05
P
upper pressure limit
100%
P
pressure for defi ning the upper proportional zone
defi nition
max
P
optimal pressure calculated at the passage
critic
temperature between the intermediate zone and
transcritical zone
T
temperature limit between the transcritical zone and
12
intermediate zone
T
temperature limit between the intermediate zone
23
and subcritical zone
T
temperature for defi ning the lower proportional
min
zone
Eib06
T
temperature for defi ning the complete opening
100%
zone of the valve
Subcooling delta for optimized regulation
Coeffi cient for determining the customized line
Regulation
Eib07
Proportional gain for the proportional + integral
regulation of the HPV valve
Integral time for the proportional + integral regulation
of the HPV valve
Proportional gain for the proportional + integral
regulation of the HPV valve with heat recovery
Integral time for the proportional + integral regulation of
the HPV valve with heat recovery
Eib16
Enabling the regulation of the gas cooler in the
subcritical zone
Safeties
Eib02
Min. opening of the HPV valve with the unit OFF
Min. opening of the HPV valve with the unit ON
Eib03
Opening of the HPV valve at start-up during pre-
positioning
Pre-positioning duration
Eib08
Enabling of the fi lter action on the HPV valve setpoint
Number of samples
Eib09
Enabling of diff erent management of the HPV valve
during heat recovery activation
Setpoint regulation of the HPV valve during heat
recovery
Time scale for the setpoint reset procedure after heat
recovery
Pressure scale for the setpoint reset procedure after heat
recovery
Eib10
HPV valve safety position
Eib11
Off set to be applied to the external temperature in the
event of gas cooler temperature probe error
Safeties
Eib12
HPV valve safety procedure enabling
Eib13
Receiver high pressure threshold
Maximum allowed receiver pressure
Maximum off set to add to the HPV setpoint when the
receiver pressure exceeds the high pressure threshold
Eib14
Receiver low pressure threshold
Minimum allowed receiver pressure
Maximum off set to subtract from the HPV setpoint
when the receiver pressure goes below the low pressure
threshold
Eib15
Enable HPV valve closure when all compressors on line
1 are off
Delay HPV valve closure when all compressors on line
1 are off
Eib17
Enable warning function when the gas cooler pressure is
too far from the setpoint for the set time
Diff erence between the gas cooler pressure and the
setpoint which generates the warning
Delay time before generating the warning
Eib32
Maximum opening of the HPV valve
Maximum variation per second allowed for the HPV
valve output
Eib28
Minimum HPV valve regulation setpoint
Enable low temp. control (lower proportional zone)
Copyright HPL March 2021
pRack PR300T +0300018EN rel. 1.5 - 02.05.2017
Description
HPV valve alarm
HPV valve output
---
6.7 RPRV valve management
Management of the RPRV valve, which is a PI regulation, is to maintain the
pressure inside the CO
receiver equal to the setpoint. The RPRV valve can
2
be managed directly by pRack pR300T with built-in driver (PRK30TD***)
or with external EVD EVO driver. Both solutions are compatible with
the majority of valves available on the market. Direct control via serial
connection is enabled under EEVS (electronic expansion valve settings),
accessible from the main menu, branch E.i.c. The confi guration parameters,
on the other hand, are accessible from the main menu, branch E.i.
6.7.1
RPRV valve accessory functions
RPRV valve management includes some accessory functions:
• Pre-positioning: entering the unit ON status, the RPRV valve remains
at a fi xed position that can be set by a parameter for a fi xed time, also
settable by a parameter, in order to be able to quickly raise the pressure
in the tank. This procedure is reactivated whenever the unit goes into
the OFF status or the RPRV valve moves into the minimum position
due to all of the compressors being turned off (optional).
• Valve closure with compressors off : if all compressors in the medium
temperature unit are turned off , the RPRV valve can be positioned
at the minimum opening value in the OFF status, which can be set
by a parameter. When a compressor is restarted, the valve restarts
the regulation with the pre-positioning procedure described in the
previous point.
• Minimum and maximum opening values: the minimum opening
value in Off status and in ON status can be diff erentiated (by keypad,
digital input or supervisor) while the maximum opening value is
unique.
• Maximum percentage variation: the movement of the valve cannot
exceed the maximum set percentage variation per second.
• Maximum receiver pressure: a maximum value can be set for
the receiver pressure, above which an alarm is triggered and unit
operation can be blocked. The block is optional and can be enabled
by a parameter.
6.7.2
Summary of inputs, outputs and RPRV valve
parameters
The following is a summary table of the inputs/outputs used and the
parameters with indications of the related confi guration screens. For
details, refer to Chapter 6 and Appendix A.1.
Summary of inputs/outputs and RPRV valve parameters
Mask
Analog inputs
Bab66, Eia01 RPRV receiver pressure probe
Digital inputs
Baadf, Eia05 RPRV valve alarm
Analog outputs
Bad15, Eia07 RPRV valve output
Digital outputs
---
Parameters
Settings
Eib18
Regulation
Eib22
Eib19
Eib20
Eib21
Safeties
Eib23
Eib24
Eib25
42
Page 91 of 172
Description
---
Enable RPRV valve management
Regulation setpoint for the CO2 receiver
pressure
Proportional gain for the proportional + integral
regulation of the RPRV valve
Integral time for the proportional + integral
regulation of the RPRV valve
Minimum opening of the RPRV valve with the
unit OFF
Minimum opening of the RPRV valve with the
unit ON
Opening of the RPRV valve at start-up during
pre-positioning
Pre-positioning duration
Maximum opening of the RPRV valve
Maximum variation per second allowed for the
RPRV valve output
HPV valve safety position
Enable RPRV valve closure when all compressors
on line 1 are off
RPRV valve closure delay when all compressors
on line 1 are off
Receiver high pressure threshold alarm
Receiver high pressure diff erential alarm
Receiver high pressure alarm delay
Receiver high pressure alarm reset type
Enable compressor shutoff with receiver high
pressure alarm
P4114S Rev 03
Tab. 6.d
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