Инструкция на Контроллеры Lennox серии PCO... бренда Lennox

USER MANUAL

SCROLL CHILLER

Scroll Manual 1.14

GENERAL DESCRIPTION OF THE APPLICATION

The software application to which this manual relates has been designed to manage all Cooling Only, Heat Pump and Freecooling Chillers equipped with scroll compressors. For this purpose we have implemented the option of using either a pCOXS or pCO1 electronic controller, based on the type of…

Hysteresis (User menu → Setpoints and parameters → H3) The typical system with hysteresis of the capacity control steps provokes an often undesired undercooling effect during the thermal load reduction phase and at the points of variation in the capacity control steps. Let us consider the following…

2. Hysteresis 30%

Tout Tin We may note that narrowing the hysteresis window has the effect of shifting the reference temperatures at which the number of active capacity control steps will be reduced; consequently, the compressors will switch off earlier. The output water will thus be less cold on average. Referring…

t_setpoint_3

+----------------------+ |SECONDARY SETPOINT F3| |SETTING | | | |Cool.: 00.0°C | |Heat.: 00.0°C | | | | | | | +----------------------+ Condition: ○ configuration of digital input ID14 (or ID6 with pCOXS) as “->secondary setpoint” (User menu → Setpoints and parameters → H1 or H2) ○ selection of…

The logic works as follows

Corrected setp. Corrected setp. Differential < 0 Max Comp > 0 Max Comp. Max Comp. Setpoint Setpoint Differential > 0 Max Comp > 0 Text Text Diff . Corrected setp. Comp. Setp. Comp. Setp. Corrected setp. Differential < 0 Max Comp < 0 Setpoint Setpoint Max Comp. Max Comp. Diff . Differential > 0 Max…

Since these are means for enabling operation, if more than one of the options is selected all will need to be in the ON status in order for the chiller to work. The main screen shows the unit's status specifying, in the event that the chiller is OFF, the condition that imposes this status. main…

m_clock_2

NB: If the units are controlled via a LAN-based system, the operating mode can be selected only on the Master unit. This will activate the same mode for the Slave units as well, overriding the other methods of mode selection. 2.5 COMPRESSORS The controller permits the management of hermetic scroll…

Delay time between two start-ups of different compressors (Manufacturer's menu → Parameters →T2) It establishes the minimum time that must elapse between two compressor start-ups, irrespective of the water temperature read and the setpoint. ON Compr. 1 ON OFF ON Compr. 2 ON OFF Figure 5: Delay time…

Circuit 1

Cooling capacity 100% 75% Circuit 2 50% 25% 0% Setpoint 16 Inlet T Setpoint + differential Figure 7: Balanced Rotation EX: Unbalanced Rotation (with 2 circuits comprising 2 compressors each) The ON sequence of the 4 compressors will be: 1. Compr.1 – circuit 1 2. Compr.2 – circuit 1 3. Compr.1…

PWM output

○ Min.Triac : minimum phase difference. ○ Max.Triac: maximum phase difference. ○ Wd Triac: duration of triac pulse. As regards the condensation control logic, besides the option of disabling it ( in which case there will not be any enabling of the fans), there are two control modes to select from…

With the pCO1 microprocessor, the logic that manages the additional digital enabling signal (NO9-NO12) will activate this output in the following cases: ○ ○ 2.6.1.3 modulating control active (with compressors running) fans switched on via override Condensation Options In addition to the condensation…

Modulating Control Fan output Max 2 (100%) Max 1 Min 0% IN Pressure setp. setp+diff Figure 12: Modulating Ctrl with 0-10V output 2.7 WATER RE-CIRCULATION PUMPS The number of pumps that can be managed by the control software depends on the type of microcontroller used. 2 pumps can be used only with a…

Pump alarm

In the event that the currently active pump goes into an alarm status, the second pump will be automatically switched on until the first one is fixed. Once the alarm has been cleared, the pump that had not completed its turn will start up again and repeat the entire cycle. Pump1: Rotation time Alarm…

Operating logic

The temperature used in the heating element control logic, in the case of a unit with a single evaporator, is the one read by the sensor on the outlet side; in the case of two evaporators, the lower of the two outlet water temperatures will be taken. If an error occurs in one of the two sensors, the…

The relevant parameters are

▪ Change, in relation to the maximum saturation temperature detected, such as to trigger the beginning of a defrost cycle ▪ Delay time for memorisation of the maximum saturation temperature following compressor start-up Saturation temp. Max Change Time Defrost starts Figure 19: Change-Based Logic…

main phase

Compressors OFF phase ½ a interval Figure 21: Devices controlled by override in the case of “Compressors OFF when Defrosting Begins” NB: In the absence of an override the fans and valve maintain the status determined by the defrost logic 2.9.3.2 Final Override - Compressors OFF when defrosting ends…

Compressors OFF phase

main phase Post-Ventilation Figure 24: Logic resulting after overrides, WRONG config. Compressor restart times A complete defrost cycle may entail several compressor restart phases (especially when the override controls are enabled) which cannot be managed according to normal compressor times. For…

Freecooling

exchanger Return from system EVAPORATOR Tin Tfc Tout Figure 25: General Layout of a Freecooling Unit 2.10.1 Activation of Freecooling Once the freecooling function has been enabled (Manufacturer's menu → Parameters → Tk), the logic will be activated, when the chiller is operating, if the following…

0% Setp+min Setp+max Tout Figure 28: Fan Ctrl - Freecooling where: ○ “Setp” represents the active setpoint ○ min: the sum of this parameter and the setpoint indicates determines the starting point of the fan modulation ramp ○ max: the sum of this parameter and the setpoint indicates determines the…

Capacity reducing override OFF

Capacity reduction w/o override Diff P Setp Figure 29 Low pressure prevention function ((Manufacturer's menu →Parameters →Ts) To prevent the triggering of a low pressure alarm, in the event that the freecooling mode is not active, the capacity control function is activated when the condensation…

ALARMS 3.1 ALARM MANAGEMENT 3.1.1 ▪ ▪ ▪ ▪ Phase Direction Alarm Input: DIN 11 Present: with pCO1 controller Active: always Effect: it stops the unit; the pump will shut down after a set delay time Configuration (Manufacturer's menu → Alarms → Uk) ▪ Enable: yes/no Delay time: not provided Reset…

Low Pressure Alarm from Digital Input Low Pressure Alarm circuit 1 Input: DIN4 (pCO XS) / DIN3 (pCO1) Present: always Active: while circuit 1 is operating Not Active: in heat pump mode (optional) and during a defrost cycle Effect: stops the compressors of circuit 1 Low Pressure Alarm circuit 2…

Thermal Alarm Circuit 2

Input: DIN6 (pCO1) Present: with pCO1 controller Active: while circuit 2 is operating Effect: stops the compressors of circuit 2 Configuration (Manufacturer's menu → Alarms → Uh) Enable: yes/no Reset: automatic/manual Delay: o at compressor start-up o while the compressors are running 3.1.7 Fan…

Pump Thermal Alarm Thermal Alarm, Pump 1 Input: DIN7 (pCO1) Present: with pCO1 controller Active: while unit is on Effect: stops pump 1; if only one pump is installed or a second pump is in an alarm status, it stops the compressors Thermal Alarm, Pump 2 Input: DIN8 (pCO1) Present: with pCO1…

3.1.13 Clock Card Alarm

(Manufacturer's menu → Alarms → U5) The alarm generated by the clock card inhibits unit On/Off switching and setpoint adjustments based on time zones. 3.1.14 Digital Alarm Output From the User menu → Alarms → K1 it is possible to configure the digital output dedicated to the signalling of alarms…

AL: 009

AL: 010 AL: 011 AL: 012 AL: 013 AL: 014 AL: 015 AL: 016 AL: 017 AL: 018 AL: 019 AL: 020 AL: 021 AL: 022 AL: 023 AL: 024 AL: 025 AL: 026 AL: 027 AL: 028 AL: 029 AL: 030 AL: 031 AL: 032 AL: 033 AL: 034 AL: 035 AL: 036 AL: 037 AL: 038 AL: 039 AL: 040 AL: 041 AL: 042 AL: 043 AL: 044 AL: 045 AL: 046 AL…

USER INTERFACE The user interface adopted, PGD1, comprises an LCD display (8 rows x 22 columns) and 6 keys. From here the user can carry out all program-related operations, view the status of the unit at all times and edit parameters. 4.1 DESCRIPTION OF KEYBOARD The 6 keys and their respective…

4.3 SWITCHING OFF OF THE UNIT

The steps necessary for switching off the unit are the following: • press to go to the main screen main +----------------------+ |U1 08:00 01/01/00| IN |OUT | 12.0°C| 12.5°C| | | | | | ON | +----------------------+ • keep the key pressed down for at least 3 seconds. The following screen will appear…

LAN and Supervision : enabling of On/Off logics and summer/winter changeovers; LAN logic and selection of parameters for serial communication Alarms: configuration of the digital alarm output and definition of serious alarms Clock: clock setting and programming of unit ON/OFF time zones (only where…

Local and remote display (within 50m) Local display Panel-mounted Remote display cable: telephone cable. TCONN connector (necessary only if both a local and remote display are present) Remote display Wall-mounted pCO microprocessor Unit o o 4.5.1.2 1 T-connector (TCONN6 with jumpers J14 and J15 in…

|Display address | |setting :00 | | | | | +----------------------+ • • Press UP or DOWN to set the address Press ENTER to save and exit the procedure 5.2 SETTING THE PCO ADDRESS (PCOXS OR PCO1) To set the address of the pCO controller, carry out the following steps: • To the pCO1 connect a display…

SCREENS The main information screens of the application, divided into the different menus, are shown below. Appearing in the top right-hand corner is a code identifying the individual screen (except the Main menu screens). 6.1 MAIN main +----------------------+ |U1 08:00 01/01/00| IN |OUT | 12.0°C|…

t_sm_disp_01

t_io_stato_01

+----------------------+ |ANALOG INPUTS D1| | | |B1: 00.0bar | |B2: 00.0°C | |B3: 00.0°C | |B4: 00.0°C | | | | | +----------------------+ 6.3.2 It displays the status of the analog inputs (value resulting from an override, where present) Inputs/Outputs Menu - I/O Override t_io_forz_01…

m_mant_sto_02

APPLICATION SETTING PARAMETERS 7.1 SETPOINT MENU Screen F2 F3 F4 F5 F6 F7 F9 Fa Fb Par. Description Setpoint Cooling Setpoint Heating Setpoint Secondary Cooling Setpoint Secondary Heating Setpoint Setpoint Inside Time zone Setpoint Outside Time zone Setpoint Inside Time zone- Cooling Setpoint…

Hh

Hi 7.2.2 Screen J1 J2 J3 J4 J5 J6 7.2.3 Screen Cooling icon configuration User Password Duration of Login w/ Password snowflake 100 5 snowflake / sun 0 / 9999 0 / 480 Default Range Description User Enable On/Off from keyboard Enable On/Off by remote contact Enable On/Off via supervisor Enable On/Off…

Pb

7.3.3 Screen N1 N2 N3 N4 N5 Compressor run time threshold Enable alarm to signal when pumps exceed run time threshold Pump run time threshold 10˙000 yes 10˙000 1˙000 / 999˙000 no / yes 1˙000 / 999˙000 h h Default Range UOM 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 xxxx…

Sc

Sd Se Sf Sg Sh Yes 7.4.2 Screen T1 T2 T3 T4 T5 T6 T7 T8 T9 Ta Tb Tc Td Te Tf Tf Tf Tg Th Ti Tj Tk Tm Tn To 2 Configuration of analog outputs Y3-Y4 MCHRTF Config. of Y1-Y2 Duty Cycle Config. of Y1-Y2 Period Config. of Y1-Y2 minimum voltage Config. of Y1-Y2 maximum voltage 1 Config. of Y1-Y2 maximum…

Tp

Tq Tr Ts Tt Tu Tv Tw Tx Ty Tz 7.4.3 Screen U1 U2 U3 U5 U6 U7 U9 Ua Ub Uc Ud Ue Uf Ug Enable Freecooling valve rotation Freecooling valve rotation threshold Freecooling valve override time Adjust Freecooling valve counter Enable coil capacity control solenoid valve Capacity control solenoid valve…

Uh

Ui Uj Uk Um Un 2 Uo 7.4.4 Screen V1 V2 V3 V4 V5 V6 V8 V9 Va Vb Vc Vd Ve Vf Vg Vh Vi Vj Vk Vn 1 Low pressure alarm delay during operation Enable compressor thermal alarm Compressor thermal alarm reset Compressor thermal alarm delay at start-up Compressor thermal alarm delay during operation Enable…

Compressors

SCREW 2 Capacity control NO / STEPS 1 Evaporator in cooling mode PLATES 2 Evaporator in heating mode FINS FAST Min. saturation temp. in cooling mode Min. saturation temp. in heating mode Min. saturation temp. in defrost mode Max. saturation temp. in cooling mode Max. saturation temp. in heating mode…

CONTROL SYSTEM ARCHITECTURE 8.1 MICROPROCESSOR LAYOUT 8.1.1 pCO1 Description of connectors 1. 2. 3. power supply connection [G(+), G0(-)]; 2A slow-blow fuse, 250 Vac (T2 A); NTC universal analog inputs, 0/1 V, 0/5 V, 0/20 mA, 4/20 mA; 4. ON/OFF and NTC passive analog inputs; 5. NTC passive analog…

pCOXS 1. Connector for 24Vac or 20/60 Vdc power supply [G (+), G0 (-)]. 2. Input (24 Vac) for phase controller and NTC analog inputs, 0/1 V, 0/5 V, 0/20 mA, 4/20 mA, +5Vref for power supply to 5V ratiometric sensors and +24VDC for power supply to active sensors. 3. Analog outputs 0/10 V and PWM…

8.2 DESCRIPTION OF INPUTS/OUTPUTS

8.2.1 pCO1 • Cooling Only – W/A Cooling Only – W/A Conn. Name Description Signal 1 Circuit 1 Compressor 1 Circuit 2 Compressors 2 Circuits 2 Compressors 2 Circuits 4 Compressors Analog input J2-1 B1 4..20 mA / 0-5V Condensation Pressure Condensation Pressure Condensation Pressure circ.1 Condensation…

J13-3

NO5 NO relay Pump 1 ON/OFF Pump 1 ON/OFF Pump 1 ON/OFF Pump 1 ON/OFF J13-4 NO6 NO relay Pump 2 ON/OFF Pump 2 ON/OFF Pump 2 ON/OFF Pump 2 ON/OFF J14-2 NO7 NO relay Antifreeze heating element ON/OFF Antifreeze heating element ON/OFF Antifreeze heating element ON/OFF Antifreeze heating element ON/OFF…

Digital output

J12-2 NO1 NO relay Compr. ON/OFF 1 Compr. ON/OFF 1 Compr.1 ON/OFF (Circ.1) Compr.1 ON/OFF (Circ.1) J12-3 NO2 NO relay Compr. ON/OFF 2 Compr.2 ON/OFF (Circ.2) Compr.2 ON/OFF (Circ.1) J12-4 NO3 NO relay NO4 NO relay Compr.3 ON/OFF (Circ.2) J13-2 J13-3 NO5 NO relay Pump 1 ON/OFF Pump 1 ON/OFF Pump 1…

J7-1

ID9 24 Vac/Vdc Water flow switch alarm Water flow switch alarm Water flow switch alarm Water flow switch alarm J7-2 ID10 24 Vac/Vdc General fan alarm General fan alarm General fan alarm - 1 General fan alarm - 1 J7-3 ID11 24 Vac/Vdc Phase direction alarm Phase direction alarm Phase direction alarm…

sensor

sensor sensor - circ. 1 sensor - circ. 1 High-pressure alarm triggered by pressure sensor - circ. 2 Compressor thermal alarm - circ 1 High-pressure alarm triggered by pressure sensor - circ. 2 Compressor thermal alarm - circ 1 J5-4 ID4 24 Vac/Vdc J5-5 ID5 24 Vac/Vdc Compressor thermal alarm…

J4-5

Y3 PWM Condensation fan control Condensation fan control Condensation fan control -1 Condensation fan control -1 J4-6 Y4 PWM Condensation fan control -2 Condensation fan control -2 High-pressure alarm triggered by pressure sensor - circ. 1 High-pressure alarm triggered by pressure sensor - circ. 2…

J2-4

B3 NTC Evaporator inlet water temperature Evaporator inlet water temperature Evaporator inlet water temperature Evaporator inlet water temperature J2-5 B4 NTC Evaporator outlet water temperature Evaporator outlet water temperature Evaporator outlet water temperature Evaporator outlet water…

J9-3

NO2 NO relay Electric heating element Compressor 2 Electric heating element Compressor 2 J9-4 NO3 NO relay Pump ON/OFF Pump ON/OFF Pump ON/OFF Pump ON/OFF J10-2 NO4 NO relay 4-way valve 4-way valve 4-way valve 4-way valve NO relay Global alarm / Serious alarm / Non-serious alarm Global alarm /…

SUPERVISION 9.1 MAIN PARAMETERS The configuration of the supervision logic can be set from the User menu → LAN and Supervision → J6 and involves defining: • communication protocol • communication speed • serial address of the unit You can select from among the following Communication Protocols: •…

9.3 CONNECTION WITH LONWORKS PROTOCOL

A connection can be made to the LonWorks network using the connector with extractable terminals, provided on request on the circuit board (Figure 31) as an alternative to the one used for the Carel and Modbus protocols: Figure 31: LON card 1. 2. 3. 4. 5. connector for connection to pCO; terminals…

Circuit 1 pressure: 15.2bars Circuit 2 pressure: 14.9bars Software version installed: CS 1.00 Software date: May ‘07 Unit Status Message By sending a specific message to the unit installed with a modem it is possible to receive information about a chiller connected to the LAN. The information given…

The configuration message must be formatted as follows

.<header>.<password>.<type 1>.<address 1>.<value 1>….<type N>.<address N>.<value N>& where: header = type of microcontroller (e.g.: pCO1) password = modem password (modem configuration parameter set from User menu->LAN and Supervision ). It must be composed of 4 characters th th I type = type of the…

4. You can send a message to switch on the unit (via the supervisor) in the heating mode and request a message to be sent reporting the unit's status. .pCO1.0000.D.002.000001.D.001.000001.A.001.000001.D.050.000001& 5. You can send a message to switch off the unit and receive a message reporting the…

Modem Configuration The chiller that will be installed with the modem kit must be configured with the address pLAN 1; therefore, in the case of a LAN system, this unit will have to be the Master. The SIM used in the GSM Modem requires the following steps to be carried out: • • • • Enable the data…

9.6 LIST OF VARIABLES UNDER SUPERVISION

Digital Variables DIGITAL VARIABLES On-Off via Supervisor Sel. Summer/Winter changeover via Supervisor DIN-High pressure from pressure switch – Circ 1 DIN-High pressure from pressure switch – Circ 2 DIN-Low pressure from pressure switch – Circ 1 DIN-Low pressure from pressure switch – Circ 2…

Freecooling Temp. Sensor Alarm

Setpoint Adjustment Sensor Alarm Outdoor Temp. Sensor Alarm Low Pressure Alarm - Circuit 1 Low Pressure Alarm - Circuit 2 High Pressure Alarm - Circuit 1 High Pressure Alarm - Circuit 2 Low Press. Alarm from Sensor – Circuit 1 Low Press. Alarm from Sensor – Circuit 2 High Press. Alarm from Sensor…

Min setpoint - Heating

10 LAN

10.1 LAN LOGIC(USER MENU -> LAN AND SUPERVISION ) (User menu →LAN and Supervision → J3) 10.1.1 Control Logic Connecting a number of chillers in a LAN (up to a maximum of 4, of the same type) makes it possible to adopt a logic whereby thermal demands are distributed in a more efficient manner than…

CASCADE Unit I System cooling capacity 100% 75% Unit I I 50% 25% 0% Setpoint 16 Inlet T MASTER Setpoint + differential st In the overall operation of the system, the passage from 0% to 100% will see the switching on, in sequence, of: 1 nd st nd and 2 compressors of unit I ; 1 and 2 compressors of…

Rotation with Stand-by Unit I Slave pLAN: 3 Unit I I Stand-by Slave pLAN: 4 Slave pLAN: 2 Unit I I I MASTER pLAN: 1 Unlike the standard rotation mode, rotation with standby provides for one of the chillers controlled by the LAN logic to be placed on standby by the Master. This status implies that…

10.2.1 Address Settings

In order to define a LAN network, you must set the addresses of the elements making it up. The maximum logic is defined as the case of 4 interconnected units plus a shared remote display terminal; below we provide a table of reference for assigning the respective addresses. Unit 1 Unit 2 Unit 3 Unit…

Connector

- pCO1: J11 ( Rx-/Tx- , Rx+/Tx+, GND) - pCO XS:J6 ( Rx-/Tx- , Rx+/Tx+, GND) PGD: Address = 25 PGD: Address = 28 LAN cable pCO1: Address = 1 pCO1: Address = 4 10.2.3 Configuration of LAN Application • Enable the LAN function : select “yes” for the parameter shown in the following mask of the (User…

Management of non-simultaneous compressor start-ups t_user_lan_5 +----------------------+ |LAN MANAGEMENT FOR J5| |STARTUP COMPRESSORS | | | |Delay : 000s | | | | | | | | | +----------------------+ where the Delay represents the time that elapses between compressor starts enabled by the Master unit…

t_sm_lan_03

+----------------------+ | C3| |Running mode active | |for LAN | | | |- Cooling | | | | | | | +----------------------+ 10.2.6 Shared Display Terminal In addition to correctly configuring the pLAN address, in order to assure correct use of the shared display terminal it is necessary to set the latter…

11.2 HIGH PRESSURE PREVENTION FUNCTION

This function, which can be selected in the Manufacturer's menu →Alarms →Ue , serves to prevent the circuits from being shut down due to the tripping of a high-pressure alarm. The parameters are: • • • setpoint (bars) differential (bars) delay time (s) The function consists in inhibiting the…

11.3.1 EVD 400 – tLAN

11.3.1.1 Address setting The drivers must be configured with a specific tLAN address Driver Driver for circuit 1 Driver for circuit 2 Address 1 2 the address can be configured using the “EDV4-UI address” application, after connecting the PC to the driver. The connection is made by means of a…

11.3.2 EVD 400 – pLAN

11.3.2.1 Address setting Where the pLAN connection is used both to connect the drivers to the controller and to connect any units to be controlled via a LAN logic, the EVD 400 address will depend on the address of the pCO to which the drivers are connected. A reference table is provided below…

Configuration of Valve Parameters

From the Manufacturer's menu →Carel EXV Drivers it is necessary to configure: • Main Parameters o Steps in Stand-by o Sensor working range o Alarm Delay Times • Autosetup Parameters o percentage of opening at start-up o type of compressors and capacity control o type of evaporator o saturation…

Scroll Manual 1.14

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