Installation and operating instructions for plant
Contents
1. e When Pb appears hold down button Arrow UP and simultaneously press button Arrow DOWN for approx 3 seconds The display then shows the first parameter P1 in the configuration level Meaning of parameters Parameter P1 Switching direction relay K1 Parameter P2 Switching direction relay K2 when fitted Parameter P3 Switching direction relay K3 when fitted Parameter P4 Switching direction relay K4 when fitted The switching direction can be set as a heating or cooling contact for each individual relay contact 0 Heating contact 1 Cooling contact Param P10 Funct K1 in event of sensor failure Param P11 Funct K2 in event of sensor failure when fit Param P12 Funct K3 in event of sensor failure when fit Param P13 Funct K4 in event of sensor failure when fit The switching status of the relay contacts can be set for the event of asensor failure 0 OFF in the event of failure 1 ON in the event of failure Param P15 Hysteresis mode target temp 1 Param P16 Hysteresis mode target temp 2 when fitted Param P17 Hysteresis mode target temp 3 when fitted Param P18 Hysteresis mode target temp 4 when fitted with reference to the compressor relay 0 symmetrical 1 one sided Page 14 Operating diagram configuration level Show setting Change setting Press Press SET button SET andlAJlor Y button simultaneously Be o Limit for T1 downwards e OG A e Lim2. 3leads D 24V DC 4 4 switch stages F 24V UC This manual contains all specifications to operate all variants MPR A 01 04 09 Page 4 Installation a Itis essential not to install the device under the following conditions e severe jolting or vibration permanent contact with water relative humidity ofmore than 90 sharply fluctuating temperatures condensation aggressive atmospheres ammonia or sulphurfumes Risk of oxidation e operation in the immediate vicinity of radio transmitters with increased levels of spurious radiation b Housing installation The housing is mounted using two lateral screw fittings e Fitthe rubber seal as shown Place the housing throught thr front opening Attach the lateral screw fittings Thighten the screws c Installing the sensor The temperature controller has been configured for a specific kind of sensors by the manufacturer see type key Notice that the controller can only work well if the right type of the sensor is fitted The sensor cable must not be chafed or kinked There must be no substantial mechanical pressure on the sensor tube Do not place the sensor and the power cable in the same cable conduit After finishing the electrical connections the regulator must be adjust in the parameter Sensor correction C91 that the measured temperature is equal with the value on the display Therefore it must used a reference thermometer See the section Setting the ac
3. prevent adjustment of the target temperature for outlet port relay K1 in the working level 0 Buttons not locked 1 buttons locked MPR A 28 08 08 Page 13 Configuration level operation Operating diagram configuration level Switching to configuration level see description Switching direction K1 Switching direction K2 Switching direction K3 Switching direction K4 Sensor failure function K1 Sensor failure function K2 Sensor failure function K3 Sensor failure function K4 Hysteresis mode for 1 Hysteresis mode for 2 Hysteresis mode for 3 Hysteresis mode for 4 Show Change setting setting Press Press SET button SET andlAlor V button simultaneously or QOM A ew or OW A or oov A or__ ogy A or__ GB Of A o OAM A or__ 7 OOF A oov A Am A Am A ogy A Eaa or OOM Operating diagram configuration level MPR A 28 08 08 This level is for configuring the regulator s basic functions To prevent interference by the end user access is made even more complex Switching to configuration level e Press up arrow and down arrow simultaneously for approx 5 seconds until C1 appears in the display e Press button Arrow UP repeatedly until the last parameter C99 at working level is reached e Press button Arrow UP again and hold down until Pb appears in the display
4. the temperature of the medium rises to 9 5 C cooling is switched on and then switched off again at 9 C e If the temperature of the medium falls below 3 5 C heating is switched on and then switched off again at 4 C Page 9 Example 2 MPR A with four switching stages to control of two cooling systems a heating system and a alarm system T3 Hysteresis 13 __ for T3 0 5K Cooling 2 upwards only __ xy Hysteresis ior T2 0 8K oe as T2 Cooling 1 10 A1 A2 gt T1 Heater 6 Hysteresis 4 for T1 0 6K downwards KTY10 6 K1 1 2 31415 6178 shofnfaf sfaf s only T4 Sensor Operating voltage Hysteresis for T4 0 1K downwards only Alarm Cooling 2 Cooling 1 Heater Caution The device is programmed so that the target temperature for heating can be changed at working level This is why the heating system is connected to relay contact K1 MPR A 28 08 08 A medium is to be maintained at a temperature of between 13 C and 6 C The permissible temperature deviations are controlled by the hysteresis settings The temperature is to be controlled by two cooling systems which will be switched on one depending on the temperature of the medium A heating system will prevent the temperature from falling below 6 C An additional alarm is to be a
5. 101658 by WELBA 01 04 09 Temperature regulator MPR A Installation and operating instructions for plant engineering companies WELBA GmbH Phone 49 0 2638 9320 0 Electronic Control Engineering Fax 49 0 2638 9320 20 Gewerbepark Siebenmorgen 6 E mail info welba de D 53547 Breitscheid Net www welba de Inhaltsverzeichnis Function MPR A 28 08 08 Function sun a ee Page 3 Intended Use io ie da a a ee Page 3 SAN nenne engere an kur EA Page 3 Key tO models 4c cnknes 2420ER ea Page 4 Installation sr un one ee eae Rea eee eae ee eS Page 5 Dimensions and techn data regulator Page 7 Dimensions and techn data sensor accessory Page 7 Operating regulatOf aua ua na ren Steele d Page 8 Examples ofuse 22 2 ooneeeeeere ee Page 8 Notes for programing of the regulator Page 11 Parameter settings in general 0005000ee Page 12 Working level operation 06 0006 eee Page 12 Programming level operation 2 5 0 6 600052 ee eee Page 13 Configuration level operation 2 22 2200 Page 14 Setting the actual value correction 2 004005 Page 16 Fault indication on the display Page 16 General measures when using electronic control systems Page 17 The microprocessor controlled temperature regulator of the series MPR Aare used to control heating and cooling processes Depending on the num
6. 21 when fitted Parameter P22 Parameter P23 Parameter P24 Parameter P25 Parameter P26 Parameter P27 Limit for target temp 1 downwards Limit for target temp 1 upwards Limit for target temp 2 downwards Limit for target temp 2 upwards Limit for target temp 3 downwards Limit for target temp 3 upwards Limit for target temp 4 downwards Limit for target temp 4 upwards Setting of input limits for target temperatures at working and programming levels Range 50 400 C Parameter P30 Parameter P31 when fitted Parameter P32 Parameter P33 Parameter P34 Parameter P35 Parameter P36 Parameter P37 Limit for hysteresis 1 downwards Limit for hysteresis 1 upwards Limit for hysteresis 2 downwards Limit for hysteresis 2 upwards Limit for hysteresis 3 downwards Limit for hysteresis 3 upwards Limit for hysteresis 4 downwards Limit for hysteresis 4 upwards Setting of input limits for hysteresis at programming level Range 50 400 K Parameter P50 Parameter P51 when fitted Parameter P52 Parameter P53 Parameter P54 Parameter P55 Parameter P56 Parameter P57 Minimum action time for relay K1 Minimum pause time for relay K1 Minimum action time for relay K2 Minimum pause time for relay K2 Minimum action time for relay K3 Minimum pause time for relay K3 Minimum action time for relay K4 Minimum pause time for relay K4 Setting of minimum action time or minimum pause time for r
7. ber of switching stages the regulator unit has between one and four relay contacts to control the compressor heaters alarms fans etc The measured temperature of the medium is permanently displayed If this temperature deviates from the selected target temperature by the hysteresis value the appropriate relay contact is activated The operation and the default values of the regulator are subdivide in three parameter levels The assessment for each level is configurable by the assemblyman At the first operating level the working level a button can be pressed to display and change the target temperature set for relay contact K1 The alter of the target temperature for the operating level can be looked Page 2 Intended use These operating instructions contain important technical and safety information Please read carefully before installation and before any work on orwith the regulator The microprocessor controlled temperature regulator type MPR A is used to control heating and cooling systems alarm devices fans etc Any other use of the device is permitted only with prior written permissi on from the manufacturer The microprocessor controller can be used after the parameters has been adjusted if it is used the first time To get start the controller without the adjustments is not igneous and can destroy the facility or the medi um which temperature has to be controlled The device is fitted with a re
8. bination must be used An RC filter must be connected as directly as possible to the inductance in order to ensure a short line In addition the component ratings of the RC combination must be geared to the inductance Too low ratings lead to excessive voltage and too high ratings cause significant losses in the interference suppresser component Another point to note here is that only capacitors which meet VDE 0656 may be used They must be suited to the mains voltage and designed for very high switching voltages The diagram on the left shows inductance interference suppression using an RC filter An RC filter should not be fitted directly to the regulator s switching contact as shown on the left as an idle current will flow through the RC combination even when the switching contact is open This current may be enough to mean that a downstream contactor is not de energised and aclosed protective contact does not reopen Page 18 MPR A 28 08 08 Semiconductor switches such as thyristors or triacs also produce interference voltages They occur as a result of non linear characteris tics and finite ignition voltages These components must be protected against excessive voltages for which mainly varistors RC combina tions or choke coils are used The use of zero voltage switches is also recommended The suggestions made represent only a few of the possible ways of protecting a microprocessor controlled regulator system from interfe ren
9. ce The suggested measures have the advantage that they will increase the lifetime of the devices as lower induction voltages redu ced spark formation will also reduce contact burn Page 19
10. ctivated at 3 C Proceed as follows Programming level e Set parameter for target temperature 1 C1 to 6 C e Set parameter for target temperature 2 C2 to 10 C e Set parameter for target temperature 3 C3 to 13 C e Set parameter for target temperature 4 C4 to 3 C e Set hysteresis parameter for target temp 1 C20 to 0 6K e Set hysteresis parameter for target temp 2 C21 to 0 8K e Set hysteresis parameter for target temp 3 C22 to 0 5K e Set hysteresis parameter for target temp 4 C23 to 0 1K See next page Page 10 Notes for programing of the regulator MPR A 28 08 08 Configuration level e Set switching direction param for K1 P1 to 0 e Set switching direction param for K2 P2 to 1 e Set switching direction param for K3 P3 to 1 e Set switching direction param for K4 P4 to 0 heating contact cooling contact cooling contact heating contact a aN aN e Set parameters for functions K1 to K4 for sensor failure P10 P13 as desired e Set hysteresis mode parameter for target 1 P15 to 1 mono directional e Set hysteresis mode parameter for target 2 P16 to 1 mono directional e Set hysteresis mode parameter for target 3 P17 to 1 mono directional e Set hysteresis mode parameter for target 4 P18 to 1 mono directional Mono directional hysteresis mode means switching direction for cooling contact hysteresis upwards switching direction for heating contact hysteresis downwa
11. cts Max switching current Max switching voltage See key to models 1 voltage free two way contact each switch setting 10AAC1 each 250 V each Display 13 mm LED display 3 digits Display range range 9 9 99 9 C other Control type 0 1 C 1 0 C Two step regulator Measurement range Usable sensor types KTY 81 210 or PT 100 Hysteresis 0 1 K to 99 9 K freely adjustable Operation Heating cooling interchangeable each switch setting z Housing NEG 48 96 M front panel cut out 42 x90 mm 3 installation depth 88 mm Protection housing front IP 64 Connection Ambient temperature operating temperature storage temperature max humidity Dimensions and technical data sensor Screw terminals 20 to 70 C 0 to 50 C 75 no condensation Technical facts with reservation Bush material 1 4301 V2A Bush length 40 mm a Bush diameter 6 0 mm 0 1 Li a ES Sensors other than our standard type are available on request different bush from or cable length Some of the options are shown here MPR A 28 08 08 Page 7 Operating regulator C A LY Working level for every day operation Programming level for setting the regulator parameters Configuration level for setting the basic functions Examples of use MPR A 28 08 08 The regulator operates at
12. egulator contact Regulator contact AC Coil RC Filter MPR A 28 08 08 If specific interference sources cannot be avoided they should at least be kept ata distance from the regulator system Capacitive and inductive couplings can cause crosstalk between high voltage lines and parallel low voltage and sensor lines This distorts measured values and signals and can disrupt the entire regulatory process It is therefore recommended that all sensors and signal lines be placed separately from the control and mains voltage lines If possible a separate mains line should be provided to feed the regula tor system This helps reduce any interference penetrating the regulator via the mains supply line Voltage surges resulting from switching substantial loads will also then be less of a problem In the case of contactors solenoid valves and other inductive consu mers the induction voltage occurring during switching has to be redu ced by appropriate protection methods The choice of methods depends on whether the consumer runs on DC orAC voltage e DC voltage In the case of d c voltage systems the induction voltage occurring can for example be limited by using self induction diodes varistors or suppresser diodes The diagram on the left shows one possibility using a self induction diode e AC voltage In the case of a c voltage interference suppression as described above is not possible Instead an RC com
13. elay contacts in order to prevent repeated switching on and off Range 0 0 999 seconds Parameter P99 Temperature scale To switch the display between degrees Fahrenheit and degrees Celsius 0 Celsius 1 Fahrenheit Page 15 Setting the actual value correction l A correction can be made to the value as measured by the sensor which applies cumulatively over the entire measuring range This is necessary when the length of the sensor cable is changed or a faulty sensor is replaced giving rise to an incorrect reading AT In order to adjust the actual value correction a reference thermometer sanasi e g WELBATHM 2000 is needed Proceed as follows e Install sensor e Measure the temperature of the medium using the reference thermometer e Switch on the thermostat and set parameter C91 in the programming level to 0 e Switch back to working level and read the measured temperature on the display e Calculate the difference between the reference thermometer temperature and the display reading e Store the difference pay attention to plus or minus in the working level under parameter C91 Fault indication on the display Faults in the regulator are indicated by a flashing display as follows LED Display Fault F1 Sensor short circuit The sensor or sensor cable is faulty and must be replaced or repaired Parameter C91 Actual value correction must then be adjusted at program
14. ell protected 0 5 kV 0 25 kV environment 2 protected 1 0 kV 0 5 kV environment 3 typical industrial 2 0 kV 1 0 kV environment 4 Industrial environ 4 0 kV 2 0 kV ment with very high interference leve As the values given in the table are maximum values operational values should remain well below them However in practice this is possible only with difficulty as even a normal contactor without interference suppres sion produces interference pulses of up to 3 0 kV For this reason we recommend that the following principles be taken into account during installation Try to eliminate all sources of interference by carrying out interference suppression and minimising the interference level Radio interference suppression is required under VDE 0875 and confirmed by VDE 0874 In principle interference must be eliminated at source The nearer the interference suppresser is to the source of interference the greater its effect Interference spreads through wires or by electromagnetic radiation It is usually the former which interferes most seriously with regulation systems Possible interference sources to name but a few include e bouncing contacts when switching loads e switching off inductive loads contactors motors solenoid valves etc unsatisfactory routing of wires too small cross sections loose contacts rhythmically changing power stages power converters power breakers high frequency generators Page 17 R
15. eresis fortarget temp 4 whenfitted The hysteresis determines the value by which the temperature of the medium may deviate from the target temperature cooling a Target temperature 2 Target temperature 3 a a Target temperature 4 corresponding target temperature contact T2 Hysteresis for Hysteresis for r before the relay contact is activat Target temperature T Te higher target temperature 1 V ed See sketch nn Ti ee Hysteresis for If the contact in question is for Tl lower a target temperature 2 cooling the hysteresis is always higher In the case of heating contacts it is below the target temperature cooling or heating contact is set at configuration level In the symmetrical hysteresis mode the value selected is distri buted on both sides of the target temperatures Hysteresis for target temperature 3 a Hysteresis for target temperature 4 SET a amp Sensor correction F r a 2 i F i r p 8 8 8 ee ee 8 8 8 8 8 OO a Button lock SET Switch back to working level Press simultaneously for approx 5 seconds Parameter C91 Actual value correction Switches back aut tically aft 2 ee Acorrection can be made to the value as measured by the sensor which applies cumulatively overthe entire measuring range See the section Setting the actual value correction on page 16 Parameter C99 Button lock This can be used to
16. it for T1 upwards pay SET O A A wei a Limit for T2 downwards SET 0 4 A a Limit for T2 upwards SET 0 4 A i a Limit for T3 downwards D A A me a Limit for T3 upwards fs OA A Limit for T4 downwards ff nu an D m 4 Limit for T4 upwards p SET Limit for hysteresis 1 downwards aoe Limit for hysteresis 1 upwards oO 5 m 4 Limit for hysteresis 2 downwards 3 Limit for hysteresis 2 pam upwards Oo DE us D m 4 Limit for hysteresis 3 downwards Limit for hysteresis 3 upwards Limit for hysteresis 4 downwards Limit for hysteresis 4 upwards 7a oa au a DORCHCHCR me wn i a m 4 Min action time K1 n pause time K1 Min action time K2 n pause time K2 Min action time K3 Oo Oo 7 ao wa SS Irre ge wm wn Min pause time K3 Min action time K4 Min pause time K4 o ga Hi J m Temperature scale Switch back to working level Press simultaneously for approx 5 sec Switches back automatically after approx OA OW Of OA OA OA Of Of e OW e Of Of e Of OR SET A Of OB OB OB OB o e oO oO oO oO oO Q e oO ke oO oO ol ol je a OA CT A A o TA KARA A AT TAT TAT A RA A AT A KA AK onds 1 minute if no further buttons are pressed MPR A 28 08 08 Parameter P20 Parameter P
17. lue correction Page 11 Parameter settings in general To adjust a parameter proceed as follows e Select parameter on pressing the SET button the present value will be displayed e Holding the SET button down simultaneously press the up arrow or down arrow until the desired value is reached e Tip Holding the arrow down longer changes the value more quickly e Release the SET button To store the changed parameter in the memory first release the ar row and then the SET button Switch back to working level possible from every parameter e Press up arrow and down arrow simultaneously for about 5 seconds The current actual value appears in the display If at programming or configuration level no buttons are presses for about 1 minute the regulator switches back to working level automatically Working level operation The working level is for everyday operation by the end user The display permanently shows the present temperature of the medium as measured Function Display the measured temperature of the medium is permanently displayed N o Pe BO m er Li a D S7 LED Display Relay contact K1 LED Display Relay contact K2 when fitted LED Display Relay contact K3 when fitted LED Display Relay contact K3 when fitted These show when the corresponding relay contact is activated Press SET button Display the target temperature set for relay c
18. ming level F2 Broken sensor The sensor or sensor cable is faulty and must be replaced or repaired Parameter C91 Actual value correction must then be adjusted at programming level F3 Memory fault Faulty regulator Remove the regulator and send it for repair FFF Measurement range exceeded The maximum measurement range of the sensor has been exceeded MPR A 28 08 08 Page 16 General measures when using electronic control systems MPR A 28 08 08 So that even complicated regulatory tasks can be presented to the user in a manner which is clear and simple and ensures high measurement accuracy today s electronic control systems make increasing use of microprocessors However the benefits of these systems are countered by the disadvantage that increased measurement accuracy is accom panied by sensitivity to interference In order to minimise the effect which interference may have on the regulator the user also must take account of a number of points when installing a new regulator Assistance here is provided by standard DIN VDE 0843 on the electro magnetic compatibility EMC of measurement control and regulatory devices in industrial process technology The following table shows for example the maximum interference levels to which according to the standard an appliance may be exposed Degree of Environment Test voltage Test voltage severity class Power supply Signal control line 1 w
19. ontact K1 Press up arrow together with SET button Increases target temperature for relay contact K1 Press down arrow together with SET button Reduces target temperature for relay contact K1 See also button lock parameter at programming level MPR A 28 08 08 Page 12 Programing level The programming level is for setting the regulator parameters operation prog g g g P Access to this level is more complex in order to avoid accidental resetting of the values by the end user Switching to programing level e Press up arrow and down arrow simultaneously for approx 5 seconds until C1 appears in the display e Press up arrow or down arrow until you reach the parameter you want adjust Meaning of parameters Operating diagram programming level Eee Parameter C1 Targettemperature for K1 Parameter C2 Targettemperature forK2 whenfitted Parameter C3 Target temperature forK3 when fitted Show Change Parameter C4 Target temperature for K4 when fitted sd see The target temperature is the temperature at which the Press Press SET button a SET _ andl lor W corresponding relay contactisto be activated button simultaneously A V Press simultaneously for approx 5 Target temperature 1 se OOV Parameter C20 Hysteresis fortarget temp 1 Parameter C21 Hysteresis fortarget temp 2 whenfitted Parameter C22 Hysteresis fortarget temp 3 whenfitted Parameter C23 Hyst
20. ontrol up to four appliances heating cooling or alarm systems The following examples show two possible uses and the appropriate parameter settings Page 8 Cooling MPR A 28 08 08 Example 1 MPR A with 2 switching stages three point regulation to control a cooling and heating system T1 Hysteresis Cooling 9 for T1 upwards only 2 o Hysteresis Heater 4 4 fo T Sensor eo eo K1 K2 Heater Operating voltage downwards only A medium has to be maintained at a temperature of between 9 C and 4 C The deviation must not exceed 0 5K A cooling and a heating system is to be used three point regulation Proceed as fallows Programming level e Set parameter for target temperature 1 C1 to 9 C e Set parameter for target temperature 2 C2 to 4 C e Set hysteresis parameter for target temp 1 C20 to 0 5K e Set hysteresis parameter for target temp 2 C21 to 0 5K Configuration level e Set switch direction parameter for relay K1 P1 to 1 cooling contact e Set switch direction parameter for relay K1 P2 to 0 heating contact e Set parameters for function K1 and K2 for sensor failure P10 P11 as desired e Set hysteresis mode parameter for target 1 P15 to 1 mono direction e Set hysteresis mode parameter for target 2 P16 to 2 mono direction e Set the remaining parameters as desired Operation e If
21. rds e Set the remaining parameters as desired Operation If the temperature of the medium rises to 10 8 C cooling system 1 is switched on and then switched off again at 10 C If the capacity of cooling system 1 is not sufficient and the temperature continues to rise to 13 5 C cooling system 2 is switched on and then switched off again at 13 C If the temperature of the medium falls below 5 4 C the heating system is switched on and then switched off again at 6 C If the capacity of heating system is not sufficient and the temperature continues to fall below 2 9 C the alarm is triggered and continues until the temperature rises above 30 C Before starting operation all pre set parameters should be adjusted to suit local conditions Wrongly set parameters can have a serious effect on functions The following pages educible all the steps involved in programming the various models In following the instructions for the various parameters take account of now many switching stages your regulator has see also key to models section For example a two stage regulator does not have parameters C3 C4 for the second and third temperatures etc Important We recommend recording details of the settings before delivery to your customer In this way you will be able to supply spare regulators pre set When replacing a regulator the only adjustment to be made at the end user s premises will then be the actual va
22. sistance temperature sensor The output ports are designed as potential free relay ports The device must not be installed in potentially explosive atmospheres MPR A meets the EC requirements for electromagnetic com patibility EMC and complies with the low voltage directive LVD The safety components meet the VDE regulations C The microprocessor controlled temperature regulator type Safet 7 The temperature regulator may only be installed by an authorised specialist observing all local safety require ments Only specialists must be allowed to access the environ ment when connected The temperature regulator contains live components and must not be opened The device must not be used if the housing or the connecti on terminals are damaged No liquids must penetrate the housing The temperature regulator may be exported to the USA with the permission of the manufacturer only MPR A 28 08 08 Page 3 Key to models The microprocessor controlled temperature regulator MPR A is available in different versions The type definition of the device can you find on the top of the housing see picture The type definition is configured as follows vle Rja 0 0 0 Switching stages Sensor preparation Voltage Switching stages Sensor preparation Voltage 1 1 switch stage KTKTY 81 210 A 230V AC 50 60 Hz 2 2 switch stages P2 PT100 2leads C 24V AC 50 60 Hz 3 3 switch stages P3 PT100
23. three levels Working level for everyday operation by the end user The present temperature of the medium as measured is permanently displayed Press the SET button to see the target temperature set for output port relay K1 Press the up arrow or down arrow key as the same time as the SET button to adjust the target temperature NB The target temperature can be adjusted here only if the programming level button lock C99 is set to 0 Programming level This is the level at which the regulatory parameters are set Setting is more complex and possible only using specific combinations of buttons so as to prevent accidental chan ges to settings Configuration level This is the level at which the basic functions of the regulator are set As subsequent interventions by the end user after the parameters have been set can result in dangerous changes to functions which might not be immediately obvious access to the configuration level is even more complex Important When programming the target temperatures for the various appliances that are connected take account of which target temperature the end user is most likely to need to adjust Regardless of the number of switching stages only the target temperature for output relay K1 can be directly adjusted at working level The MPR A series of microprocessor controlled regulators are very versatile Depending on the number of switching stages they can be used to c
24. tual value correction on page 16 Observe the permitted temperature range to which the sensor is suited Sensor cable Temperature range PVC standard 30 to 70 Silicon 50 to 150 Teflon 100 to 205 MPR A 28 08 08 Page 5 d Electrical connection Before connecting ensure that the mains voltage is the same as indicated on the device s type plate Incorrect electrical connection can cause damage to the regulator and to the equipment The mains voltage should not be switched on until all components including the sensor are connected When connecting appliances or loading the relay con tacts with currents of gt 10A AC1 it is essential to fit con tactors Downstream contactors must be fitted with an RC protecti on circuit see also page 17 You will find the correct circuit diagram for your regulator on the back of the housing above the connection terminals The electrical connection procedure is as follows e Connect heating and cooling systems in accordance with the appropriate circuit diagram Connect alarm devices fans etc depending on the number of switching stages o Connect mains su pply leads K2 K3 Observe the following tips e Use cable bushes e Make sure that cables cannot chafe i 1314 15 Sensor Operating voltage MPR A 28 08 08 Page 6 Dimensions and technical data regulator Operating voltage Relay conta
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