PlantVisorPRO - Air Conditioning Carel - Free user manual and instructions

USER MANUAL PlantVisorPRO Carel

1.1 Smooth lines: how it works

The main target of the Smooth lines function is to keep the control temperature very stable around the set point, avoiding frequent ON/OFF cooling request cycles, controlling the valve by changing the superheat set point (P3). The parameters involved in the Smooth lines confi guration are listed in the following table: Parameter Menu Description VisibilitySt CtL Control set point Supervisor & user interfacerd CtL Control diff erential Supervisor & user interfaceP3 Eud Superheat set point Supervisor & user interfacePHS Eud Positive SH off set Supervisor, UI, Applica PLt Eud Off set below set point for cut-off Supervisor, UI, Applica PSI Eud Integral time Supervisor, UI, ApplicaPSM Eud Enable function Supervisor, UI, Applica PSP Eud Proportional coeffi cient Supervisor, UI, Applica PSd - Derivative time SupervisorTSH - Superheat threshold Supervisor FSt - Superheat averaging time window Supervisor Tab. 1.a The function operates as follows: when the control temperature reaches the set point, the refrigeration cycle is not stopped, rather the expansion valve opening is modulated. Modulation is achieved by changing the superheat set point based on a specifi c PID algorithm. The calculated superheat set point will be between the values P3 and P3+PHS, and consequently the valve will open or close based on the required control temperature, while staying close to the set point.

Floating suction +030220575 Rel. 1.2 - 22.10.2021 ENG The algorithm remains active until the control temperature falls below the threshold St-PLt; control in any case stops below this threshold. When the Smooth lines function is enabled, a variable tells the supervisor whether the MPXPRO (MPXPRO/ MPXone Medium + EVDice/mini and MPXone Advanced) is operating with a certain margin, i.e., the suc- tion pressure set point on the corresponding line can be increased without jeopardising control. In detail, superheat set point is higher than P3 + THS. The average is calculated inside the time window FSt. Fig. 1.b

1.2 Smooth lines on MPXone* MPXpro: con guration

Smooth lines is available on MPXone* and on MPXPRO from version 3.2 and higher. The Smooth lines confi guration parameters are listed in Table 1a. The basic settings are listed below, with the parameter name and default value:

1. enable function, default value is PSM = 0 (disabled);

2. set maximum superheat off set, default value is PHS = 15 (K).

This parameter prevents the calculated superheat set point from rising too high

3. set compressor cut-off off set, default value is PLt = 2 (K).

This parameter prevents the control temperature from dropping too far below the set point, stopping the cooling request when the temperature falls below this safety threshold.

4. set main control diff erential, default value is rd = 2 (K);

if smooth lines is enabled, the suggested value is rd = 4 (K).7 Floating suction +030220575 Rel. 1.2 - 22.10.2021 ENG

1.3 Floating suction on pRack

The pRack application features the Floating suction function, allowing the supervisor (PVPRO/Boss) plug-in to increase the suction pressure set point when the unit operating conditions are favourable. In practice, the supervisor, by monitoring the units connected to the rack, verifi es that these are able to reach the set temperatures, and only in this case enables the rack to increase the suction pressure. Increasing the suction set point allows the system to operate more effi ciently, wasting less energy. The confi guration path is as follows : C. Compressors d. Energy saving a. Line 1 Fig. 1.c This path refers to suction Line 1, Line 2 is confi gured in the same way. If the rack manages one suction line only, the path will be: C.Compressors Æ d.Energy saving Fig. 1.d Fig. 1.e Fig. 1.f Fig. 1.g Once having entered the confi guration menu, screen Cad08 is used to enable the Floating suction function.

• Screen Cad09 defi nes the range in which the set point can be changed by the Floating suction plug-in.

• Screen Cad10 defi nes the maximum variation for increasing or decreasing the set point for each request from the plug-in, and the time it takes for the rack to decrease the set point if communi- cation with the supervisor is lost.

• Screen Cad10a defi nes which communication port on pRack is used for the supervisor.8 Floating suction +030220575 Rel. 1.2 - 22.10.2021 ENG

1.4 Floating suction on the supervisor

The PVPRO and Boss supervisors include the Floating suction function, which can be enabled and confi gured via a special menu. The supervisor must be able to identify which units are connected to the specifi c rack, so as to monitor them and safely enable the increase in the suction set point On the PVPRO supervisor, this can be activated by clicking “Suction Pressure Optimisation” in the “Energy” menu. Fig. 1.h On the Boss supervisor, select “Suction Pressure Optimisation” from the Add-ons menu on the left side of the screen. Fig. 1.i9 Floating suction +030220575 Rel. 1.2 - 22.10.2021 ENG The “fl oating suction” algorithm can be used both on units with the Smooth lines algorithm or without this function (e.g. IR33, MPXPRO version < 3.2). If all of the units have the Smooth lines function available and activated, the algorithm can be optimised by checking a specifi c fl ag in the plug-in. For devices that do not manage the “Smooth lines” function, the supervisor can estimate whether the cooling capacity delivered is adequate, evaluating the ON/OFF times for each unit (Duty cycle mode). This guideline helps choose the most suitable option: Fig. 1.j

Once having entered the Floating Suction Pressure menu, in the “Energy” section, the plug-in is configured in three steps, as listed below:

• Associate units with the selected pRack

• Confi gure plug-in (Duty cycle or Smooth lines) Below is a detailed description of the steps and an overview of the main information on the plug-in.

In the “Racks” tab, choose which racks to enable for the fl oating suction function. On the selected pRack units, the suction pressure will be gradually increased, if the cabinet operating conditions allow. Confi guration procedure:

• Step 1 check the box relating to the devices involved.

If there is at least one rack selected for the Floating suction function, a number of units can then be associated with the rack. Each rack can have more than one unit associated ; each unit however can only be associated with one rack. In the “Association” tab, proceed as follows:

• double click a compressor rack; the name will be shown in the “Selected rack” fi eld;

• Step 2 select the devices from the list on the left;

• Step 3 check the “Smooth lines function” box only if all the devices are equipped with this function;

• click the “right” arrow to associate the units with the rack;

2.3 Dashboard: main view

The “Main” tab shows all the compressor racks selected for the fl oating suction function. The status of set point modifi cation is shown by a triangle on PVPRO or an arc on BOSS, from the minimum to the maximum value. In this tab, users can:

• enable or disable the plug-in;

• access the confi guration page and the monitoring page for each rack. PVPRO START STOPEnter congurationand monitoringpagesMinimum setpointMaximum setpoint Fig. 2.e BOSS START/STOPCongurationand monitoringMinimum setpointMaximum setpointActual set Fig. 2.f From the “Dashboard”, clicking on the pRack description (blue), users can access the confi guration and monitoring view of the plug-in. These two screens are displayed diff erently, depending on whether the associated units feature the Smooth lines function, i.e., whether or not the association has been created with the Smooth lines fl ag checked (see paragraph 2.2 for details). If the units are not equipped with the Smooth lines function, or no association with the Smooth lines function has been created, the plug-in will work in “duty cycle” mode. The following chapters show the details and confi guration of the plug-in, based on the mode activated, Smooth lines or Duty cycle.13 Floating suction +030220575 Rel. 1.2 - 22.10.2021 ENG

2.4 Con guration with Smooth lines

From the main screen, to access the confi guration view, click the pRack description in blue in PVPRO, or select the graph in BOSS. PVPRO Fig. 2.g BOSS Fig. 2.h The plug-in settings can be changed in the “Parameters” tab, in turn divided into two main tabs: Con guration The configuration section shows the values of the parameters set on pRack. The following can be set here:

• the minimum and maximum rack working set point, within which the plug-in will calculate the optimal set point.

• The gradient between set point increase/decrease steps

• The time interval between samples (minimum time 10 minutes)

• The maximum number of units, divided by colour (operating conditions), for which the plug-in will calculate the rack set point Units The units section shows the list of devices associated with the rack and involved in the calculation of the optimal set point, the line they belong to and the corresponding serial address. This screen can be used to set parameter TSH (default 2K), the off set to be added to parameter P3 (superheat set point).14 Floating suction +030220575 Rel. 1.2 - 22.10.2021 ENG PVPRO pRackPVPROUtilities Fig. 2.i BOSS Fig. 2.j There are four thresholds, associated with diff erent colours, referring to device operating conditions:

• Red The fi rst colour, green, indicates units where the average set point value is higher than P3 + TSH; this means the suction pressure set point can be increased. The status (colour) of the units is evaluated after each sampling interval. The rules that defi ne monitoring are illustrated in Figure 2.f.The following table shows the criteria followed to adjust the rack set point based on the number of units with the same colour: Utility is working hard: there is no margin to rise up suction pressure setpointUtility is working ne: reset status Unit condition Action on set point all green increase # of yellow < threshold increase # of yellow ≥ threshold hold # of orange < threshold increase # of orange ≥ threshold hold # of red > 0 hold # of red ≥ threshold decrease Fig. 2.k15 Floating suction +030220575 Rel. 1.2 - 22.10.2021 ENG When the Smooth lines fl ag is checked, any units that are either offline or do not feature the Smooth lines function but that are in any case associated with the plug-in, are managed specifi cally. If a unit is not available (offl ine) after the sampling time, this will be shown in black and considered unavailable for the pressure set point increase. This unit is considered as if it were yellow, orange or red, depending on how many times it has been declared offline. If a unit without Smooth lines is associated with the plug-in, the supervisor will not monitor its operating conditions and will show it as N/A (not available). As the increase in rack suction pressure can aff ect the behaviour of the unit, the plug-in will restore the set point to the minimum value. These two specifi c scenarios are illustrated in Figure 2.g. Y N/A yellow orange

if a unit is shown as N/A, it means it doesn’t feature the Smooth lines function and any increases in the set point will be reset. Fig. 2.l

2.5 Operating details with Smooth lines

The “Details” tab off ers users a detailed review, divided into four groups, of the plug-in confi guration and operating status. The “information” section shows a summary of the settings, both relating to the supervisor and the pRack, in particular:

• The time of the last sampling performed by the plug-in;

• The set point corresponding to the last sampling;

• A summary of the current confi guration. PVPRO BOSS Fig. 2.m Fig. 2.n The “Racks” section shows the current set point, as well as some historical samples useful for understanding the pressure trend over a period of time.16 Floating suction +030220575 Rel. 1.2 - 22.10.2021 ENG PVPRO Fig. 2.o BOSS Fig. 2.p The “Units” section provides an overview of the instant status of all units, as well as the trend over the previous periods. This screen is useful for understanding which units are working in more critical conditions. PVPRO Fig. 2.q BOSS Fig. 2.r Notice: in the table, the columns marked “T- *” correspond to the time interval between samplings (min. 10 min.) The fi nal section summarises the number of units for each colour, divided between online and offline.17 Floating suction +030220575 Rel. 1.2 - 22.10.2021 ENG PVPRO Fig. 2.s BOSS Fig. 2.t

2.6 Con guration without Smooth lines (Duty cycle)

From the main screen, to access the confi guration view, click the pRack description in blue in PVPRO, or select the graph in BOSS. PVPRO Fig. 2.u BOSS Fig. 2.v The plug-in settings can be changed in the “Parameters” tab, in turn divided into two main tabs:18 Floating suction +030220575 Rel. 1.2 - 22.10.2021 ENG Con guration The confi guration section is divided into two parts; the fi rst is used to set some parameters relating to the pRack, such as:

• the minimum and maximum rack working set point, within which the plug-in will calculate the optimal set point.

• the gradient between set point increase/decrease steps

• the time interval between samples (minimum time 10 minutes) The second part is used to set the parameters relating to the plug-in, such as:

• Time frame for calculating the Duty Cycle

• Frequency for calculating the Duty Cycle

• Percentage of maximum connection failure time

• Maximum number of units not connected Units The units section shows the list of devices associated with the rack and involved in the calculation of the optimal set point, the line they belong to and the corresponding serial address. This screen is used to set the cabinet operating percentage, which by default is set to 70% PVPRO Fig. 2.w BOSS Fig. 2.x19 Floating suction +030220575 Rel. 1.2 - 22.10.2021 ENG In this case, as the units do not feature smooth lines logic, the plug-in checks the cabinet activation percentage over a specifi ed period of time. If the operating percentage measured is greater than the set threshold, it is assumed that the cabinet has no operating margin and consequently the rack suction pressure set point cannot be increased. The threshold is defined by entering a percentage for each unit in the “Maximum Duty Cycle” column. The following table shows the meaning of the settings and the corresponding default values. Parameter Description Default valueTime frame for calculating the DC The unit duty cycle will be calculated within this time frame. The value can range from 10 to 180 minutes.120 minutesFrequency for calculating the DC This specifi es the frequency of the potential action on the set point: at the end of each period, the calculated duty cycle will be compared against the threshold for increasing or decreasing the set point. The value can range from 10 to 180 minutes.30 minutesMaximum connection failure time Maximum percentage of failed measurements for each unit associated with the rack. If this value is exceeded, the unit is considered offl ine. 30% Maximum number of units not connected If the number of offl ine units exceeds this number, the suction pressure set point will not be changed.

2.7 Operating details (without Smooth lines)

The “Details” tab off ers users a summary of the plug-in confi guration and operating status. The “information” section shows a summary of the settings, such as:

• the minimum and maximum rack working set point, within which the plug-in will calculate the optimal set point.

• The gradient between set point increase/decrease steps

• the time interval between samples (minimum time 10 minutes)

• Number of confi gured devices

• Maximum number of offl ine devices and percentage of cycle time before considering units offl ine (above which the rack set point is decreased)20 Floating suction +030220575 Rel. 1.2 - 22.10.2021 ENG The “Units” tab off ers an overview of the instant operating status, the current, minimum and maximum duty cycle and shows which units are decreasing the rack set point. PVPRO STEP 2 STEP 1

2.6 Con guration sans Smooth lines (Duty cycle)