3371 Superheat Controller RWR62.732
Contents
1. Alarm contact Q1 is controlled by the safety functions Depending on the circuitry this changeover contact can be used either for actuating a separate alarm horn or for inte gration in the compressor s safety circuit In the simulation mode the required valve opening default value 0 can be entered on the user interface This is very helpful when filling the plant with refrigerant for short time emergency operation service work etc In this operating mode the minimum superheat is monitored In the simulation mode the supervisory functions are active only if the operational status signal E1 is present For safety reasons the normal control mode is automati cally resumed after 15 minutes Casing Mounting choices Connection terminals Operating and display elements The RWR62 732 is a compact controller conforming to DIN 43 880 Gr 1 housed in a closed plastic casing The superheat controller can be mounted in the control panel in one of the following ways e In a standard control panel conforming to DIN 43 880 e Wall mounting on top hat rails which are already fitted EN 50 022 35 x 7 5 e Wall mounting with two fixing screws e Flush panel mounting with the help of the ARG62 10 mounting kit Plug in screw terminals The RWR62 732 is operated with the operating elements located on the unit front No aids such as a PC tool are required 5 14 Siemens Building Technologies Superheat Controller CE1N332. Functions Factory Code setting REFRIG UNITS BAR C CAP NONE SENSOR NI1000 RANGE _ 35 35 C Can only be selected with internal capacity control Selectable Range step R22 R134A R404A R407C R507 R290 R717 R1270 R 410A R 23 R 600a BAR C BAR F PSI F PSI C NONE EXT INT ___NI1000 0 10V_ _299 9 99 9 C 0 1 C Can only be selected with internal capacity control and an active sensor If the wrong type of refrigerant is selected the plant can be damaged Adjustment of all setpoints and parameters such as proportional band integral action time etc for the superheat capacity controller and the MOP function The setpoint of the MOP function must be adjusted as specified by the supplier of the compressor or as demanded by the application Function Superheat PlD sequence Capacity control Functions Factory Selectable Parameter Code setting Range step Setpoint AT tOH t0 AT SP 7 0K 4 0 16 0 K 0 1 K P band AT XP 10K 2 200 K 1K Integral action time AT TN SEC 30s 0 600 s 10 min 1s D part ATD 0 0 5 Max limitation MOP SP 15 0 C 35 35 C 0 1 C P band MOPXP 50K 2 200K 1K Integral action time MOP TN SEC 30s 0 600s 10 min 1s Maximum setpoint CAP SMAX 18K 0 50 K 0 1K change with superheat Setpoint of medium CAP SP 6 C 35 90 C 0 1 C temperature TM ss E
3. P band CAP XP 35K 2 200K 1K Integral action time CAP TN 95s 0 600 s 10 min 1s The minimum overheat is fixed at 2 0 K and cannot be changed Can be parameterized only if external or internal capacity control has been selected in the configuration mode Can be parameterized only if internal capacity control has been configured Capacity control is accomplished by increasing the superheat For this reason a re duction in capacity is always associated with a drop in the evaporation temperature In the case of chillers with no frost protection additives or direct expansion air coolers there is thus a risk of icing under part load conditions In simulation mode the valve can be opened for service purposes The position feed back signal and the values of pressure and temperature can be displayed Parameter list Functions Factory Selectable Function Parameter Code setting Range step l Ventil _manueller ffnungssgrad_ EIV MAN V ouni 7 14 Siemens Building Technologies Superheat Controller CE1N3371E Landis amp Staefa Division 29 06 2001 A Important Control mode Installation notes In simulation mode the supervisory functions are active only if the operational status signal E1 is present For safety reasons the normal control mode is automatically re sumed after 15 minutes In this mode all current input and output variables of the superheat and capacity control can be displayed
4. Siemens Building Technologies Landis amp Staefa Division Superheat Controller CE1N3371E 29 06 2001 Input B4 Alarm relay Q1 Forced opening of the valve A Important Mechanical design External capacity control DC 0 10 V signal from an external controller UNIGYR POLYGYR etc A measured value of lt 0 5 V or 10 5 V produces the following effects The LCD displays ERROR in place of the actual value of superheat At If the actual value crosses the range limit the respective range limit value will flash The controllers output Y1 switches to 0 V Relay Q1 will be de energized Internal capacity control with passive sensor Signal from a passive temperature sensor NI 1000 A measured value of lt 35 C or gt 90 C means short circuit or open circuit which produces the following effects The LCD displays ERROR in place of the actual value of superheat At If the actual value crosses the range limit the respective range limit value will flash The controllers output Y1 switches to 0 V Relay Q1 will be de energized Internal capacity control with active sensor A measured value of lt 0 V or 10 V produces the following effects The LCD displays ERROR in place of the actual value of superheat At If the actual value crosses the range limit the respective range limit value will flash The controllers output Y1 switches to 0 V Relay Q1 will be de energized
5. Commissioning notes Wiring must be made in compliance with the following connection diagram AC 24V ka 3371A02 a aaa Display L we vm a Units Terminals B1 Pressure sensor QBE621 P10U B1 M Evaporation pressure B2 Temp sensor QAZ21 682 101 B2 M Suction gas temp B4 Only if capacity control is configured B3 Position feedback EIV temperature sensor passive B4 M Only required with capacity control temperature sensor active signal transmitter DC 0 10 V depending on the configuration medium temperature or external signal DC 0 10 V H2 Horn alarm E1 Release K1 Enable G GO Power supply AC 24 V M1 Compressor Q11 Q12 Alarm horn NI Controller RWR62 732 Q11 Q14 Compressor safety circuit Y1 El expansion valve EIV M2FE MVL Y1 Positioning EIV Display Optional display Y2 DC 0 10 V signal proportional to the e g UNIGYR POLYGYR etc setpoint increase with superheat If there is no pump down before switching off the unit the evaporator pressure can raise above 9 bar 130 5 psi relative In this case PolyCool Superheat should not be wired into the safety circuit of the compressor see chapter 7 Required documentation Refrigeration data Checking the installation of peripheral devices Configuration and parameter settings Note To commission the controller the following pieces of documentation are required e The Installati
6. integration in chillers air handling units etc Auxiliary functions A number of auxiliary functions enhance efficiency and supervision of the refrigeration plant Enabling operation via a digital input e g by any operational status signal from the compressor Selection of different types of refrigerants Conversion of pressure to the respective temperature of the selected refrigerant Display of all measuring variables and of the valve s manipulated variable Optional display of the superheat setpoint change in the case of capacity control external display Controller Type reference Inputs Outputs Analog binary Binary Analog Binary RWR62 732 5 2 ee eae Customized Landis amp Staefa also supplies customer specific controllers that differ from the standard controllers products in terms of refrigerant selection and or outer appearance Please contact us if you require customized products Peripheral devices The PolyCool superheat controller uses two sensors and one valve made by Landis amp Staefa Units Data sheet no e Temperature sensor QAZ21 682 101 with a sensing element LG Ni 1000 Q 1848 OEM e Pressure sensor QBE621 P10U 1 9 bar delivering a DC 0 10 V measuring signal 1905 e Electronic injection valve EIV M2FE L MVL661 25 MVL661 with a DC 0 10 V input 4712 4713 4714 Safety transformer 25 VA to EN 60 742 not included in the delivery Optio
7. 2 10 cycles Red factor with inductive at 3 Ares 2 10 cycles loads cos phi 0 8 0 85 DC 2 10 cycles External fuse on input side max 10A Changeover switch Q1 Insulating strength Between relay outputs and low voltage SELV Between relay outputs and adjacent relays AC 3750 V to EN 60 730 1 AC 3750 V to EN 60 730 1 13 14 Siemens Building Technologies Landis amp Staefa Division CE1N3371E 29 06 2001 Superheat Controller Dimensions 27 5 A L Ee Dt Vo ee eg CL SE co l S g gph Sr UL LO Ki T y 44 EN 50 022 35 x 7 5 68 Lat 52 a 72 5 Z a 8 14 14 1999 Siemens Building Technologies AG Siemens Building Technologies Superheat Controller CE1N3371E Landis amp Staefa Division 29 06 2001
8. gained from practical experience The Installation and User Manual CE1U3371X contains detailed information about how the controller can be fine tuned to achieve optimum performance 10 14 Should faults or malfunctions on the controller valve or sensors occur the following list shows the possible causes and how the faults can be rectified Component Fault Possible cause remedy Passive Measured value flashes Sensor cable with an open circuit temperature Display 90 C 194 F not connected sensor NI1000 Measured value flashes Sensor cable with a short circuit Display 35 C 31 F Active tempe Measured value flashes Sensor cable with an open circuit rature sensor e Display depending not connected and other DC on the configuration Faulty sensor signal transmitter 0 10 V signal e Display 0 V transmitters Measured value flashes Faulty sensor signal transmitter UNIGYR e Display depending POLYGYR on the configuration External noise voltage on the signal etc e Display 10 V line Pressure Measured value flashes Sensor cable with an open circuit sensor Display 9 bar 131 psi not connected Measured value exceeds 9 bar 131 psi Measured value flashes Sensor cable with a short circuit Display 1 bar _ 14 5 psi Siemens Building Technologies Landis amp Staefa Division Superheat Controller CE1N3371E 29 06 2001 Component Fault Possible cause remedy Electro
9. 71E Landis amp Staefa Division 29 06 2001 Operating card com partment LCD Operating buttons A Value Attach to AT Superheat EvY Manipulated variable Po Evaporation pressure relativ D dp WE 9 TOH Suction gas temperature B2 8 5 f f f Operating card LCD Operating buttons compartement The card compartment contains the application specific operating instructions operating cards The LCD displays e The current operational data max three digits e The function code and the symbols The operating buttons provide the following functions e Operating buttons are used to change flashing data e Operating buttons INFO are used to select the screen Button lt is used to select the previous screen button gt to select the next screen 4 gt e When the screen changes button gt is also used to confirm a flashing display e Operating button SEL is used to change settings and by pressing it again to confirm SEL the change amp A flashing display indicates adjustable data Operation Selection of operating mode Exception Configuration mode CONF 6 14 For the configuration and fine tuning of the superheat controller there are different operating levels and operating modes available In normal operation PolyCool is in the control mode By simultaneously pressing the buttons for a certain time the required operating mode will be activated Operat
10. Controller Electrical installation A 8 14 For mounting and electrical installation the following notes should be observed For mounting on DIN rails no additional parts are required A For wall mounting two screws for a hole diameter of 3 7 mm are required B For flush panel mounting C with the help of the Landis amp Staefa ARG62 10 mounting kit Mounting Instruction M 3351 1 A 3371Z09 The wiring can be made with standard cables Shielded cables are recommended only if the controller is exposed to strong electromagnetic fields EMC The operating voltage must satisfy the requirements for safety extra low voltage SELV to EN 60 730 The transformers used must be safety transformers with double insulation conforming to EN 60 742 They must be designed for 100 duty When using several transformers in the system terminals GO must be galvanically interconnected The PolyCool RWR62 732 controllers operate on AC 24 V max 10 A extra low voltage and are short circuit proof If voltages of more than AC 24 V are fed to the low voltage terminals the controller or other connected devices can be damaged beyond repair Also voltages exceeding 42 V represent an electric shock hazard Mains voltages up to AC 250 V may only be fed to the potential free contact Q1 Siemens Building Technologies Landis amp Staefa Division Superheat Controller CE1N3371E 29 06 2001 Connection diagram
11. SIEMENS 497 vais A STAFA S G GH mung 732 8 PolyCool POLYCOOL Superheat Controller RWR62 732 for chillers air conditioning units etc Standalone electronic superheat controller for use with any type of dry expan sion evaporator in refrigeration plants The MOP Maximum Operating Pressure function and the monitoring of sensors and of minimum superheat are inte grated The controller can be included in the chiller s safety circuit Optionally control of the cooling capacity can be configured It operates on AC 24 V All required data are entered on the controller No tools needed Use The PolyCool superheat controller with its associated components ensures optimum operation of the refrigeration unit Been rp x Options Required only if control of the cooling capacity is configured refer to page 3 Selection of application CE1N3371E Siemens Building Technologies 29 06 2001 Landis amp Staefa Division The controller ensures optimum filling of the evaporator under all load conditions re sulting in low energy consumption Various monitoring functions enhance operating safety and extend the plant s live Field of use The controller has been designed for use with all standard types of dry expansion vapo rators such as plate tube and fin heat exchangers and is therefore especially suited for
12. a Selection of units The temperature can be displayed in C or F and the pressure in BAR or PSI Selection of It is possible to configure three different applications application e Default pure superheat control refer to diagram on page 1 e External capacity control S TM temperature sensor UNIGYR POLYGYR Joker etc e Internal capacity control TM NI1000 or m temperature sen ZH sor with DC 0 10 V measuring signal oI 145 Display UNIGYR or Mnp maL XY ky KP SC ae POLYGYR etc L em EI Q1 B3 Y1 B1 52 Ba Y2 Superheat control The superheat controller monitors the temperature differential between the suction gas temperature and the calculated evaporation temperature TOH TO to maintain the adjusted setpoint AT The electronic injection valve is controlled via analog output Y1 CES S 100 R 0 gt AT Tou To AT SP Setpoint of superheat External The capacity of the refrigeration unit drops as the superheat increases Using a capacity control DC 0 10 V signal the setpoint of superheat control can be increased via input B4 The signal is calculated and delivered by an external controller UNIGYR POLYGYR etc based on the measured medium temperature TM 3 14 Siemens Building Technologies Superheat Controller CE1N3371E Landis amp Staefa Division 29 06 2001 Internal capacity control Standard functions The setpoint of superheat is increased proportionally as a function of the voltage at input B4 The maximum
13. e C conformity Standards Connection terminals Weight excl Packing Dimensions Universal inputs B1 B4 B1 Pressure sensor bar B3 Position feedback signal valve analog voltage B4 Medium temperature B4 External signal B4 According to the configuration B2 Temperature sensor LG Ni 1000 0 C B4 Medium temperature 12 14 Operating voltage AC 24 V 20 Q1 Q6 AC 24 230 V Safety extra low voltage SELV to EN 60 730 Frequency 50 Hz 60 Hz RWR62 732 5VA Cycle time Y1 0 5s Cycle time Y2 1 55 Actual values and setpoints 3 digits Resolution 0 1 Analog outputs DC 0 10 V 2 digits resolution 0 1 V 1 Binary switching outputs off on Transport IEC 721 3 2 Climatic conditions Class 2K3 Temperature range 25 70 C Humidity lt 95 rh Mechanical conditions Class 2M2 Operation IEC 721 3 3 Climatic conditions Class 3K5 Temperature range 5 50 C Humidity lt 95 rh Normal contamination EN 60 730 Casing IP 20 to EN 60 529 Front IP 40 to EN 60 529 Automatic electrical controls for household and similar use EN 60 730 Energy management equipment UL 916 Production and customer service to ISO 9001 According to the directives of the European Union Low voltage directive 73 23 EEC Emissions EN 50 081 1 Immunity EN 50 082 1 Safety EN 60 730 Plug in screw terminals for wires min 0 5 mm dia 2x15 mm or 1x 2 5 mm max Controller 0 40 kg Ref
14. er to Dimensions Range Under and overrange Resolution Accuracy of RWR62 732 Max current drawn Internal resistance R DC 0 10 V DC 1 4 11 4 V 1 0 mV 0 2 0 V at 0 V 0 5 0 V at 10 V 0 11 mA gt 100 kQ Max permissible cable length for dia 20 6 mm 300 m also refer to specification of connected unit Range Under and overrange Resolution Accuracy of RWR62 732 Measuring voltage 35 130 C 50 150 C lt 0 05 K at0 C 1K 40K max DC 5 0 V Siemens Building Technologies Landis amp Staefa Division Superheat Controller CE1N3371E 29 06 2001 Binary control input E1 E2 Analog output Y1 Y2 Voltage modulated VM Binary switching out put Q1 Measuring current Max permissible cable length for dia gt 0 6 mm 2 6 3 4 MA 300 m total line resistance of 4 5 Q corresponds to an error of approx 1 K Sensing voltage for control commands AC 24 V Current drawn lt 8 mA Max permissible cable length for dia 20 6mm 300 m Range DC 0 10 V Under and overrange DC 1 4 11 4 V Resolution 15 mV Max current 1 mA Switching capacity of relay contact Q1 Alternating current Direct current Min contact rating At mains voltage At low voltage AC 24 230 V 4A res 3 A ind max DC 50 V max 40 W max 5 A AC 230 V 5 mA DC 24 V 10 mA Max starting current 10A 1s Life of relay contacts AC at 0 1 A res 2 10 cycles at 0 5 Ares
15. increase SMAX corresponds to DC 10 V and is entered in the parameter mode The setpoint used for superheat control represents the sum of the setpoint of overheat AT SP entered in the parameter mode plus the increase The temperature of the medium is acquired via input B4 Depending on the configurati on of input B4 it is possible to choose a passive NI 1000 sensor default or an active DC 0 10 V sensor The measurement range of the active sensor can be set between 99 9 and 99 9 C Internal capacity control controls the medium temperature TM according to the setpoint CAP SP entered in the parameter mode in that it reduces the capacity of the refrige ration unit by increasing the setpoint of superheat control The maximum increase SMAX is entered in the parameter mode i Z SMAX 3371D 0 TM 0 CAP SP Setpoint medium temperature Enable Binary input E1 Protective functions for the compressor Minimum limitation of superheat MOP function MOP Operating safety Input B1 Input B2 4 14 In general the control and monitoring functions are enabled by an operational status signal received from the plant When feeding an AC 24 V signal e g operational status signal from the compressor to the binary input E1 the control of the evaporator and the safety functions for the com pressor will be activated To ensure the reliability of the refrigeration plant and to prolong the life of the compres sor
16. ing mode Activation time in seconds Parameter mode 5 Simulation mode Configuration mode If the controller has already been configured the control mode will automatically be activated when switching on From any other mode the controller will automatically return to the control mode 15 minutes after pressing the INFO button on the right If settings in the configuration mode are changed while the controller is in operation does not apply to units controller output Y1 will switch to 0 V In that case the control will be released again only after all following parameters have been enabled by press ing the INFO button on the right controller must be brought into the control mode Following the initial power up the controller automatically enters the configuration mode In this mode the type of refrigerant is selected and the unit of temperature C or F and pressure BAR or PSI determined Optionally control of the cooling capacity can be configured Siemens Building Technologies Landis amp Staefa Division CE1N3371E 29 06 2001 Superheat Controller Parameter list A Parameter mode PARA Parameter list Note A Icing Simulation mode SIMU Application Capacity control Type of sensor To reconfigure the controller refer to Selection of operating mode above Function Selection of refrigerant Unit Parameter Refrigerant SI or UN units l Measurement range
17. l devices Fault status signals When starting up the controller for the first time the configuration mode appears First the correct type of refrigerant and the units must be selected The types of refrigerant that can be selected are R 22 R 134A R 404A R 407C R 507 R 290 R 717 R 1270 R 410A R 23 and R 600a If the wrong type of refrigerant is selected the plant can be damaged The temperature can be displayed in C or F and the pressure in BAR or PSI Configurable are also refer to pages 3 and 4 e Default pure superheat control e External capacity control e Internal capacity control Refer to page 7 parameter mode parameter list Before switching the refrigeration plant on the peripheral devices should be checked e Temperature and pressure sensors The suction gas temperature TOH the evaporation pressure PO the evaporation temperature TO and in accordance with the configuration the medium temperature TM are displayed in the control mode e Electronic injection valve In the simulation mode the degree of opening MAN of the electronic injection valve can be preset Also it is possible to check whether the valve s actual position EIV X agrees with the manually preset position EIV Y When the wiring of the plant and all peripheral devices are in order the plant can be switched on The factory set parameters for superheat control XP TN and D the MOP function and the capacity control XP and TN are values
18. nally depending on the configuration of capacity control another temperature sensor or external signal transmitter DC 0 10 V is used e g POLYGYR Joker or UNIGYR A The controller and the above mentioned peripheral devices have been matched to the application covered by this data sheet Therefore valve and sensors may not be repla ced by products of other manufacture Configurable functions The controller s functions are preconfigured By changing the parameters the functions can be matched to the type of plant see also chapter operation on page 7 Parameter list Selection of Control of the evaporator is based on true superheat control For this purpose pressure refrigerant PO acquired at the evaporator output is converted to the respective temperature of the refrigerant used 2 14 Siemens Building Technologies Superheat Controller CE1N3371E Landis amp Staefa Division 29 06 2001 The controller contains the polynomials of the following types of refrigerants R 22 R 134a R 404A R 407c R 507 R 290 R 717 R 1270 R 410A R 23 R 600a A R290 und R1270 valves are not explosion proof A R 717 NH3 requires the use of valves suited for ammoni
19. nic No position feedback signal Connecting cable for feedback sig injection valve 0 V nal with an open circuit not con EIV nected Valve does not open Connecting cable not connected In the simulation mode the valve can be checked by manually ente ring the degree of opening and by comparing it with the position checkback signal Valve faulty Position feedback signal does Cable for feedback signal not con not match the manually en nected for connection terminals tered degree of opening refer to data sheet Open circuit or valve fault Icing of evaporator when valve Valve faulty is closed Electronic calibration of valve not correct Valve does not fully close possibility of dirt inside the valve Controller No display Check power supply AC 24 V Manipulated variable always Short circuit sensor with open 0 VY Y1 circuit No enabling via E1 Controller faulty Icing of evaporator with no Controller output Y1 is not 0 V enabling via E1 Controller fault External noise voltage on the signal line to the EIV ig External capacity control Internal capacity control 11 14 Siemens Building Technologies Superheat Controller CE1N3371E Landis amp Staefa Division 29 06 2001 Technical data A Power supply Power consumption Interrogation rate Display LCD Environmental conditions Degree of contamination Degree of protection Product standards Quality assuranc
20. on and User Manual CE1U3371X supplied with the controller e The plant connection diagram and all other control documentation kept in the control panel or by the plant operator To configure the PolyCool RWR62 732 control loops and to set the relevant parame ters the following plant data are required e Type of refrigerant used R 22 R 134a etc e Design data of evaporator Superheat max evaporation temperature MOP Before applying power to the controller AC 24 V the installation must be checked to make certain it is wired according to the above connection diagram To meet the plant specific requirements the controller must be configured by author ized staff who must also set the relevant parameters e The project specific data must be transferred to the controller The Installation and User Manual contains the step by step procedure which must be followed e The operating cards supplied with the controller carry the application specific data in the various languages Place the cards with the required language in the controller s card compartment Enter changed data on the cards The values and settings entered on the controller are saved in non volatile memory even in the event of a power failure 9 14 Siemens Building Technologies Superheat Controller CE1N3371E Landis amp Staefa Division 29 06 2001 Selection of refrigerant A Selection of units Selection of application A Icing Checking the periphera
21. the following protective functions have been integrated To protect the compressor from shocks caused by liquid refrigerant the valve will be closed in modulating mode when the minimum superheat falls below 2 K Limitation of the maximum evaporation temperature is another protective function pro vided for the compressor H operates in PI mode and overrides the normal control func tion to maintain the maximum evaporation temperature When power is supplied to the controller relay Q1 will be energized The following actions protect automatic control operation against faults at the universal inputs B Measurement of pressure A measured value of lt 0 V or 10 V produces the following effects The LCD displays ERROR in place of the actual value of superheat At If the actual value crosses the range limit the respective range limit value will flash The controllers output Y1 switches to 0 V Relay Q1 will be de energized When returning to the normal operational values relay Q1 will automatically be energized again Measurement of temperature A measured value of lt 35 C or gt 90 C means short circuit or open circuit which produces the following effects The LCD displays ERROR in place of the actual value of superheat At The value of the measured suction gas temperature TOH flashes one of the above extremes The controllers output Y1 switches to 0 V Relay Q1 will be de energized
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