Инструкции на Контроллеры Lennox серии PCO...

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1. Стр. 1

   Microprocessor User Manual PCO-HWA-UM-GB-02_LENNOX 20/01/2003 1/40

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   PCO-HWA-UM-GB-02_LENNOX 20/01/2003

3. Стр. 5 1. General description of the application

   The operation of HWA-C units, HWA-H units (heat pump model) and HWA-F (freecooling model) is managed by application software installed in the controller on the unit. The main features of the application program are described below. 1.1 Types of units controlled The software is designed to control…

4. Стр. 6 2 Regulation logic

   2.1 Inlet temperature regulation Inputs used: • Evaporator inlet water temperature Parameters used: • Regulation setpoint • Proportional band for input temperature regulation. • Type of regulation (proportional or proportional + integral) • Integration time (if proportional + integral regulation is…

5. Стр. 7

   An "R" will appear in the upper right corner of the setpoint masks to indicate the activation of the secondary setpoint. Remote Setpoint From the M_USER24 mask it is possible to enable the remote setpoint function that uses an analog input. The signal will be converted between the minimum and…

6. Стр. 8 2.2.3 Minimum compressor “OFF” time

   (ref. mask M_MANUF40, 5.1.7 see Manufacturer menu , page 27) This determines the minimum time the devices must remain off. After they are shut off, the compressors cannot start up again until the set time has elapsed. ON Shut-off Request OFF ON Device OFF Figure 3: Minimum compressor off time 2.2.4…

7. Стр. 9 2.3 Condensation Control

   Condensation can be regulated according to the following modes • on/off based on compressor operation (without pressure transducers); • on/off or modulating based on the pressure transducer reading (when high pressure transducers are enabled); Inputs used: • Condensing pressure probe of first…

8. Стр. 10 Condensation on/off based on compressor operation

   If NO is selected in the M_MANUF50 mask (see page 27) the fans’ operation will depend only on the operation of the compressors. Condensation on/off based on pressure sensor If PRESSURE is selected in the M_MANUF50 mask (see page 27), the fans’ operation will depend only on the pressure read by the…

9. Стр. 11 2.3.3 Prevent function

   Selecting this function requires access to a factory-set password. It serves to prevent circuits from being blocked due to the triggering of the high pressure alarm. It can be set only on units having two compressors per circuit. Setpoint and differential values must be selected from the M_MANUF80…

10. Стр. 12 Pressure

    Fine Set Set inizio t1 t2 t3 Defrosting cycle Time Figure 8: Defrosting cycle Simultaneous defrosting mode Even if only one circuit requires defrosting, all circuits are forced into the defrosting mode. Circuits not requiring defrosting (temperature/pressure higher than the end defrost threshold)…

11. Стр. 13 2.6 Freecooling operating logic

    The free cooling function (a feature of HWA-F units) allows the water in the system to be cooled free of charge, thanks to a water heat exchanger cooled by outdoor air. This guarantees: • production of chilled water at zero cost in wintertime; • lower operating costs during in-between seasons; •…

12. Стр. 14 2.6.3 Combined operating mode: mechanical cooling + free cooling

    If the free cooling function does not suffice on its own to provide the desired water temperature values, the unit will switch into the combined operating mode, with the activation of mechanical cooling. The compressors are switched on as adjustments occur in the inlet water temperature, with…

13. Стр. 15 Case 2

    Tin = 14°C Text = 3°C Tfc = 9.5°C Tout forecast with compressor on = 7 °C The compressor start is enabled → Tout = 7°C 2.6.7 Free Cooling Alarm The free cooling alarm system has been implemented for the purpose of identifying a malfunctioning of the free cooling valve. It is based on the readings of…

14. Стр. 16 3 Start-up and configuration

    3.1 Terminal with keyboard and display Figure 14: Terminal The user terminal is shown in the picture. It consists of a 4 line x 20 column LCD, keyboard and LEDs controlled by a microprocessor: from the terminal the user can set the control parameters (setpoint, differential band, alarm thresholds…

15. Стр. 17 3.3 Keyboard

    Key 1 ↓ Key 2 ↓ Key 3 ↓ Key 4 ↓ ↑ Key 8 ↑ Key 9 ↑ Key 10 ↑ Key 11 Key 5 ↓ ↑ Key 12 Key 6 ↓ ↑ Key 13 ↑ Key 14 Key 7 ↓ ↑ Key 15: Key 1: Accesses the mask displaying the fundamental machine data and status. Key 2: Accesses device maintenance data (hours of service of a device and hour meter reset…

16. Стр. 18 3.4 Starting up the unit for the first time

    When the microprocessor is connected to the power supply, the main menu will be displayed (M_Main). It contains the following information: M_Main • • • • current date and time; evaporator inlet water temperature; evaporator outlet water temperature; unit status; +--------------------+ |00 | |Inlet…

17. Стр. 19 4 Alarm management

    The alarms are divided into three categories: 1. Warnings only (with display of warning message and buzzer or display of warning message, buzzer and alarm relay) 2. Circuit alarms (with deactivation of the circuit concerned, display of alarm message, buzzer and alarm relay); 3. Serious alarms (with…

18. Стр. 20 Alarm description

    Code Mask Troubleshooting Evaporator pumps overload AL:003 M_Alarm105 Verify the correct working of the pumps B1 probe fault or not connected AL:030 M_Alarm130 Verify the electrical wiring or replace the probe B2 probe fault or not connected AL:031 M_Alarm135 Verify the electrical wiring or replace…

19. Стр. 21 5 Menu tree structure

    5.1.1 Main menu M_MainMask +--------------------+ |00 | |Inlet water 00.0°C| |Outlet water 00.0°C| |ON | +--------------------+ M_Main20 +--------------------+ |Water temperature: | |Inlet 00.0°C| |Outlet Ev.1 00.0°C| |Outlet Ev.2 00.0°C| +--------------------+ M_Main30 +--------------------+…

20. Стр. 22 M_Maint6

    +--------------------+ |Pump 2 hour meters | | | | | |Hours 000000| +--------------------+ M_Maint10 +--------------------+ |Hour meters | | | |Compressor 1 000000| |Compressor 2 000000| +--------------------+ M_Maint15 +--------------------+ |Hour meters | | | |Compressor 2 000000| |Compressor 4…

21. Стр. 23 M_Maint45

    +--------------------+ |Filters config. | |Enable N | |Dig. delay time 0s| | | +--------------------+ From this mask it is possible to enable the software filters applied on analog inputs. The detected input value is transmitted to the control if it maintains the value for a time equal to or greater…

22. Стр. 24 5.1.3 I/O Menu

    This set of masks provides a complete display of the statuses of the analog and digital inputs and outputs connected to the microprocessor. M_Pw_InOut +--------------------+ | INPUT/OUTPUT MENU | |--------------------| |Insert maintenance | |password 0000 | +--------------------+ M_InOut05…

23. Стр. 25 5.1.4 Clock menu

    M_Clock5 +--------------------+ |--------------------| | Clock not | | installed | |--------------------| +--------------------+ M_Clock10 +--------------------+ |Clock configuration | |--------------------| |Time 00:00| |Date 00/00/00| +--------------------+ When the clock key is pressed, this mask…

24. Стр. 26 M_User17

    +--------------------+ |Regulat. tmperature | | | | | |Type INLET | +--------------------+ M_User20 +--------------------+ |Inlet regulation | | | |Type PROPORTION.| |Integration t. 0000s| +--------------------+ If inlet regulation is selected, it is possible to choose whether to adopt a…

25. Стр. 27 M_User45

    +--------------------+ |Parametri freecool.:| | | |Delta 00.0°C| |Diff. 00.0°C| +--------------------+ M_User50 +--------------------+ |Defrost parameters | | | |Start 00.0°C | |Stop 00.0°C | +--------------------+ In this mask it is possible to set the defrost regulation parameters. M_User55…

26. Стр. 28 M_Manuf55

    +--------------------+ |Condensation | | | |Fans Nr. 0 | |Condensator: SINGLE | +--------------------+ M_Manuf60 +--------------------+ |Condensation | | | |Setpoint 000.0---| |Diff. 000.0---| +--------------------+ M_Manuf70 +--------------------+ |Inverter | |Max. speed 00.0V| |Min. speed 00.0V|…

27. Стр. 29 5.1.8 Alarm menu

    Each mask gives information about a specific alarm situation. The activation of the masks is accompanied by the sounding of the buzzer and tripping of the general alarm signalling relay. By pressing the ALARM key keys. Pressing the once the user can access the first active mask and then scroll all…

28. Стр. 30 M_Alarm180

    +--------------------+ |AL:042 | | Compressor 2 | | maintenance | | | +--------------------+ M_Alarm185 +--------------------+ |AL:043 | M_Alarm195 +--------------------+ |AL:050 | | 32K clock board | | fault or not | | connected | +--------------------+ | Compressor 3 | | maintenance | | |…

29. Стр. 31 6 Application setting parameters

    6.1 Maintenance menu Parameter description Mask U.M. Default Pump 1 maintenance alarm threshold M_Maint20 - 10x1000 Pump 2 maintenance alarm threshold M_Maint21 - 10x1000 Compressor 1 maintenance alarm threshold M_Maint25 - 10x1000 Compressor 2 maintenance alarm threshold M_Maint30 - 10x1000…

30. Стр. 32 External setpoint max value

    M_User24 °C 50.0 Temperature band M_User25 °C 4.0 Time between main pump/fan and compressors M_User30 s 5 Delay on switching the main pump/fan off M_User35 s 5 Digital input remote on / off enable M_User40 - N Digital input remote summer / winter enable M_User40 - N Supervisory remote on / off…

31. Стр. 33

    High pressure prevent delay M_Manuf81 s Transducers high pressure alarm enable M_Manuf84 - N Transducers high pressure alarm Setpoint M_Manuf85 bar 27.0 Transducers high pressure alarm differential M_Manuf85 bar 2.0 Low pressure alarm at start-up delay M_Manuf90 s 120 Low pressure alarm running…

32. Стр. 34 7 Architecture of the control system

    7.1 Microprocessor layout Connector description 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. connector to the power supply [G(+), G0(-)]; fuse 250 Vac, 2A delayed (T2 A); universal analog inputs NTC, 0/1 V, 0/5 V, 0/20 mA, 4/20 mA; passive analog inputs NTC and ON/OFF passive analog…

33. Стр. 35 7.2 Description of inputs and outputs

    7.2.1 Chiller only cooling model Conn. Name Signal Description 4 Compressors - 2 Circ. 2 Compressors – 2 Circ. 1 Compressor – 1 Circ. 4..20 mA 4..20 mA 4..20 mA NTC NTC NTC NTC NTC Condensation pressure circ.1 Condensation pressure circ.2 Remote adjustment of setpoint Inlet water temperature Outlet…

34. Стр. 36 7.2.2 Heat pump chiller

    Conn. Name Signal Description 4 Compressors - 2 Circ. 2 Compressors – 2 Circ. 1 Compressor – 1 Circ. 4..20 mA 4..20 mA 4..20 mA NTC NTC NTC NTC NTC Condensation pressure circ.1 Condensation pressure circ.2 Remote adjustment of setpoint Inlet water temperature Outlet water temperature 1 Outlet water…

35. Стр. 37 7.2.3 Freecooling chiller

    Conn. Name Signal Description 4 Compressors - 2 Circ. 2 Compressors – 2 Circ. 1 Compressor – 1 Circ. 4..20 mA 4..20 mA 4..20 mA NTC NTC NTC NTC NTC Condensation pressure circ.1 Condensation pressure circ.2 Remote adjustment of setpoint Inlet water temperature Outlet water temperature 1 Outlet water…

36. Стр. 38 7.3 Optional boards

    7.3.1 RS485 serial board for supervisory function For the serial connection to a local or remote supervision system it is necessary to install an RS485 serial board, available on request (see Figure 16: RS485). Figure 16: RS485 Serial Board Connection to the local supervisor computer The connection…

37. Стр. 39 7.4 Technical data

    General specifications operating conditions protection rating heat and fire resistance class Immunity against over voltages number of manoeuvring cycles of automatic operations (e.g.: relay) Class and structure of software -10T60 °C 90% R H not condensing IP20, IP40 on front panel only class D (UL94…

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    PCO-HWA-UM-GB-02_LENNOX 20/01/2003

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