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Siemens Building Technologies

Electronic Air / Fuel Ratio Control System

CC1P7873.1en

HVAC Products

5 Description of functions

15.10.2002

The programmed curves define the actuators'

required

positions

depending on the

current «Load». Each actuator has a feedback potentiometer «P» that delivers the

ac-

tual position

signal.

The cables of the feedback potentiometers must be screened.
On the RVW26…, the shield must be connected to terminal

«

M»

.

The shield may never be connected to «PE».

The 3-position converters compare the setpoint with the actual value and pass appro-
priate positioning commands to the actuators.

AUX1(1)

AUX1(2)

Position

Position

Load

Load

Position

Load

Y3

Y4

B2

78731d03/0601

M

P

Fig. 11

Control of the actuators

Note

:

The positioning accuracy (neutral zone) of the 3-position converter is 40 mV.
The RVW26… selects the smallest positioning pulse such that the actuator makes a
movement of 40 mV (

D

position = 40 mV).

During normal burner operation and burner off periods, readiness contact «Q4 - Q5» is
closed.

Readiness contact «Q4 - Q5» opens:

·

When the RVW26… detects inadmissible states at its inputs or outputs

·

When the RVW26… detects a fault while performing the self-tests

·

When the RVW26… is not live

·

After a reset or after switching on the RVW26… as long as the unit performs the

self-tests

This contact must be included in the burner control’s control loop, thus ensuring that the
burner can be started only when no fault is signaled by the RVW26...
If the plant shall

lock

itself when the RVW26... detects a fault, the readiness contact

must be included in the burner’s locking loop (refer to chapter «Functional readiness
and faults»).

Note:

When readiness contact «Q4 - Q5» is open, «Q4» is connected to «H» and signals
nonreadiness or a fault of the RVW26… when contact «H» is sensed.

After resetting the

RVW26… by a short removal of power, contact

«H»

remains active for about 2 seconds.

During this period of time, the RVW26… makes a self-test. If successful,

«Q4 - Q5»

closes

(also refer to section «Function description of power ON and reset»).

Control of the
actuators

Readiness contact

«
...
15
16
17
18
19
...
»

Содержание RVW26.000B27

Страница 1: ...uilding Technologies HVAC Products RVW26 000B27 Electronic Air Fuel Ratio Control System Basic Documentation The RVW26 and this Basic Documentation are intended for use by OEMs which integrate the ratio control system in their products ...

Страница 2: ...2 Startup 14 5 3 Burner operation 15 5 4 Shutdown 18 5 5 Function description of power ON and reset 19 5 6 Selection of type of fuel 20 5 7 Compensation of hysteresis 22 5 8 Application of a correcting variable 24 5 9 Load signal output X1 26 6 Sequence of functions 27 6 1 RVW25 and RVW26 with the burner control 27 6 2 Explanations relating to the sequence diagram 27 6 3 Sequence diagram 28 7 Basi...

Страница 3: ...ucture of the display 44 16 Applications 51 16 1 Basic diagram of a plant with a modulating burner one type of fuel 51 16 2 Basic diagram of a plant with a modulating burner one type of fuel 52 17 Engineering notes 53 17 1 Requirements placed on burner design 53 17 2 Engineering 55 17 3 Requirements placed on the actuators and potentiometers 56 17 4 Requirements placed on the variable speed drive ...

Страница 4: ...d reliability of the electronic air fuel ratio control system the following points must also be observed Condensation and other effects of humidity must be avoided Should they occur the unit must be allowed to completely dry before switching on again Static charges must be avoided as they can destroy the unit s electronic compo nents Recommendation Use ESD equipment 1 2 Mounting notes Ensure that ...

Страница 5: ...e work must be carried out by qualified staff Each time a unit has been replaced check to ensure that wiring is in an orderly state and that the wires are firmly connected 1 7 Disposal notes The unit contains electrical and electronic components and may not be disposed of to gether with household waste Local and currently valid legislation must be observed ...

Страница 6: ...re of plug in design and used with the following types of housings ARG61 040 or ARG61 010 A socket for connecting the handheld terminal AZW20 20 is located behind the alumin ium front plate The front plate can be sealed Abbreviations and designations used in this document A End switch Fully open used with actuators LR Load controller Aux Auxiliary function P Potentiometer used with actuators FA Bu...

Страница 7: ...01 FU TG AUX FUEL AUX1 AUX2 M M M G FA M RVW26 LR Fig 2 Basic diagram of burner control load controller RVW25 and RVW26 The RVW26 must always be used in connection with a burner control an RVW25 and a load controller that delivers either a 3 position or DC 0 10 V control signal Both burner startup and burner shutdown are controlled by the burner control The RVW26 is designed specifically for use w...

Страница 8: ...y functions SA7 The auxiliary actuators can be used for control tasks where an actuating device re sponds to changes in burner output for example Throttling damper in the flue gas recirculation Adjustable burner head Flue gas damper for combustion chamber pressure control Primary air damper with burners using staged air supply The following illustrations show a choice of applications In all applic...

Страница 9: ...ol System CC1P7873 1en HVAC Products 3 General 15 10 2002 M AIR M SA5 78731g01 0601 M FU FUEL SA2 M SA4 M SA7 Fig 4 Single fuel burner with adjustable head and flue gas damper M AIR M SA5 78731g02 0601 M FU FUEL SA2 M SA4 Fig 5 Single fuel burner with adjustable head ...

Страница 10: ...ig 7 Dual fuel burner with flue gas damper and water injection All combinations shown above can also be used in connection with O2 trim control In all cases O2 trim control acts on the fan motor that is controlled by the variable speed drive On the applications according to Figures 4 and 5 the airflow resistance volumet ric airflow also changes depending on actuator SA5 of the RVW26 To ensure that...

Страница 11: ...t RVW25 000B27 Same as the RVW20 001E27 but with control of a variable speed drive for control of the fan speed refer to Basic Documentation CC1P7872 1en Electronic air fuel ratio control unit RVW26 000B27 Extension of the RVW25 by 2 output channels Housing for wall mounting ARG61 040 Housing for flush panel mounting ARG61 010 Tacho generator interface AGK34 000 Handheld terminal AZW20 20 with 2 m...

Страница 12: ...ors SQM SQN 90 1000 W ASZ12 803 Single potentiometer 135 1000 W ASZ12 833 Double potentiometer 90 1000 W ASZ22 803 Double potentiometer 135 1000 W ASZ22 833 Load controller RWF40 After a certain number of operating hours the backlash of the geartrain of these actuators can reach levels that do not allow the RVW2 to achieve precise positioning especially in the case of constant loads with the nomin...

Страница 13: ... Q1 TG BV1 RVW26 U1 LKZ G LKA LKM Y20 Q3 LR M 78731a01 0601 Q1 K1 Quit 4 Q3A U1 X1 X3 U3 Q4 H Q5 Y20 G N AUX AUX1 AUX2 FUEL 5 20 LR M BV K1 X3 Q2 8 18 7 11 9 10 TxD RxD TxD RxD GND GND Fig 8 The numbers in parentheses give the terminal markings of the LAL2 LFL LGK and LOK analog or 3 position control signal The burner control s start control loop includes control contact R e g RWF40 and readiness ...

Страница 14: ...mpletion of INTERVA the actuators are driven to the ratio control positions as quiquly as possible That position can be different from the ignition load position The RVW26 has thus reached its operating position The signal at terminal U1 will be interpreted as a controller signal to be passed on to the actuators The digital signals at TxD and RxD are used for optimizing the dynamic behavior of air...

Страница 15: ...s a basic rule the running time of the actuators should be 50 of the variable speed drive s ramp time This means that the rate of load change is largely dependent on the ramp time of the variable speed drive Should the RVW26 000B27 not be able to follow the load change of the RVW25 000B27 a stop signal will be sent to the RVW25 000B27 which stops the load change until the RVW26 000B27 delivers a g...

Страница 16: ...a maximum of 2 curves is thus selected also refer to sec tion Selection of fuel Load Integrator Fuel select F1 F2 X1 U1 Setload 0 10 V AUX2 1 AUX2 2 AUX1 1 AUX1 2 Load Position Position Position Position Position Load Load Load 78731c02 0601 0 10 V Position Position Position Fig 10 Load settings Setload Output as defined by the integrator internal signal with a value of be tween 0 100 Load Current...

Страница 17: ...g normal burner operation and burner off periods readiness contact Q4 Q5 is closed Readiness contact Q4 Q5 opens When the RVW26 detects inadmissible states at its inputs or outputs When the RVW26 detects a fault while performing the self tests When the RVW26 is not live After a reset or after switching on the RVW26 as long as the unit performs the self tests This contact must be included in the bu...

Страница 18: ...no longer to load positioning signals Sets Q1 0 V Closes all actuators When all actuators are closed Q1 AC 230 V indicates readiness to make a new start RVW26 Display Q3 Q2 Y20 Q1 U1 8 9 0 TxD RxD RxD TxD n display of burner output on the RVW26 Note The RVW26 identifies the burner control s startup and shutdown sequence from the control commands This control sequence takes place according to a fix...

Страница 19: ...t Q4 Q5 closes and the display returns to normal operation At this point in time the RVW26 tests the end switches of the actuators by driving them briefly toward Fully open and then immediately toward Fully closed Brief switching off and on of mains voltage reset resets the RVW26 after a lockout As long as the cause of the fault is not removed the RVW26 will again go to lockout and display the cor...

Страница 20: ...terminal F1 Signal at terminal F2 Meaning AC 0 V AC 230 V Fuel 2 is selected that is the curves and parameters for fuel 2 are active AC 230 V AC 230 V Inadmissible state lockout occurs after about 4 seconds AC 230 V AC 0 V Fuel 1 is selected that is the curves and parameters for fuel 1 are active AC 0 V AC 0 V This state is tolerated in phases 8 9 and 0 In all other phases this is an inadmissi ble...

Страница 21: ...ctuator The potentiometer s feedback signal is fed to terminal B2 The auxiliary actuator is automatically po sitioned according to the AUX1 1 or AUX1 2 curve 2 actuators The potentiometers feedback signals are fed to terminals B2 and B3 Both actuators can be switched externally with an auxiliary contact of the fuel selec tor The inactive actuator should be driven to the end switch position Fully c...

Страница 22: ...rom above output ad justment toward CLOSED Fig 31 illustrates this 1 The burner s output shall be increased from to which means that the actuator will have to travel along the curve from a to b 2 Then the burner s output shall be reduced again to which means that the ac tuator will have to travel from b to a For the same output 0 there is thus a difference H in the actuator s position 2 1 78731w01...

Страница 23: ...ssioned for the first time refer to Commissioning notes for burners Sequence of operations with compensation of hysteresis 1 The reduction in output is made 2 The required position of the actuator is decreased by H 3 The required position of the actuator is increased by H H selected value of hysteresis in V Note If a curve is programmed that decreases the position of the actuator when the output i...

Страница 24: ...mbustion process When using operation with an impact from both auxiliary actuators the readjustment of the O2 valve is made in parallel This readjustment of the O2 value is made proportionally to the current burner otuput and to the influencing factor DISTURB Setload Setload Correcting variable X2 V x DISTURB 10 V x 100 x Setload Setload Load signal without the correcting variable Setload Load sig...

Страница 25: ... X2 Impact on excess air X2 not connected No impact maximum amount of excess air X2 0 V No impact maximum amount of excess air X2 rises Impact increases amount of excess air diminishes X2 9 8 V Maximum impact minimum amount of excess air X2 10 V Maximum impact but will be interpreted as a fault after 30 seconds which automatically sets the impact to 0 maxi mum amount of excess air Note If the valu...

Страница 26: ...ctronic Air Fuel Ratio Control System CC1P7873 1en HVAC Products 5 Description of functions 15 10 2002 5 9 Load signal output X1 An analog signal is available at terminal X1 of the RVW26 It corresponds to the burner output ascertained at U1 ...

Страница 27: ...r events can trigger the change from one phase to an other 6 2 Explanations relating to the sequence diagram The program sequence of the RVW26 is divided into a number of phases The sequence diagram shows the normal sequence of burner startup operation and shutdown A certain event is always required for a phase to change to the next e g an input sig nal a specific position of an actuator etc The e...

Страница 28: ...inLoad 78731d04 1002 Q3 Q2 Y10 Y20 Q1 Q4 Q5 Y3 Y5 Y8 Y4 Y6 Fig 15 Sequence diagram Signal must be present or output is under voltage 1 Signals at Y10 or Y20 only act on output X1 Signal must not be present or output is not under voltage 2 RVW26 follows the signal at U1 for controlled operation Signal can be present Output controlled t4 Interval Condition for transition to the next phase lim Durati...

Страница 29: ... Y5 Y6 B4 Q4 Q5 RVW26 AZW20 20 H Fuel 1 Fuel 2 U1 78731n01 0601 FA FU DC 0 10 V RVW25 X1 DC 0 10 V Position Position AUX2 1 AUX2 2 U3 RVW25 X3 DC 0 10 V RVW25 Q2 Q3 Y20 Y10 Q1 Q2 Y8 DC 0 10 V X2 X2 AUX1 1 Load Position Position AUX1 2 DC 0 10 V X3 Fuel select Programming Control M M AUX1 2 AUX2 M G AGK34 000 RVW25 B1 TG AUX1 1 Load Load Load P P P RxD GND Fig 16 Basic diagram ...

Страница 30: ...dback potentiometers cutout inputs B2 and B3 are switched 2 Fuse S1 for outputs internally according to the type of fuel Y3 Y4 and Q1 currently burnt 3 Acknowledge relay with contact Q1 12 Data memory as an 4 Readiness relay with readiness contact exchangeable plug in module Q4 Q5 H and fuse S2 14 Socket for the 5 Mains voltage inputs with optocoupler handheld terminal AZW20 20 6 Control outputs 1...

Страница 31: ...s outputs I O 15 10 2002 9 Assignment of terminals and descrip tion of inputs outputs I O 9 1 Assignment of terminals Mains voltage Extra low voltage M U10 B2 M 5V U1 U10 M B3 U10 M X2 M TxD GND M B4 U10 M M X1 78731a04 0601 U3 X3 L Y6 Q3 Y5 Y10 Y4 Y3 F1 F2 N N L Q4 Q1 Q2 N Y20 Q5 H Y8 RxD RVW26 Fig 20 Assignment of connection terminals of the ARG61 040 ...

Страница 32: ... Signal from burner control First fuel valve on off Q3 I AC 230 V Signal from burner control Fan on off Q4 Q5 H O potential free Readiness contact control loop Indicates operational readiness of the RVW26 TxD O Interface for the RVW25 000B27 RxD I Interface for the RVW25 000B27 GND Reference potential for the interface U1 I DC 0 10 V Signal input for analog burner output control U3 I DC 0 10 V Sig...

Страница 33: ...3 4 5 6 7 XX X 8 9 XX Self test after power ON Burner switched off Standby Fan starts to run end switch test Actuators open for prepurging fan runs up to maximum speed Prepurging Actuators travel to the ignition position Waiting for fuel valve Interval Actuators travel to minimum output Burner in operation burner output in Fuel valve closed postpurging Actuators close Fault code in the event of fa...

Страница 34: ...ted behind the hinged alu minium front plate The AZW20 20 is powered via the connecting cable When using the connecting cable the AZW20 20 allows the flame to be adjusted and viewed up to a distance of 20 m between the burner and the RVW26 The handheld terminal features a display with 4 lines each comprising 16 characters and 6 buttons Fig 20 Handheld terminal AZW20 20 with connecting cable KF8859...

Страница 35: ...s easily set the parameters of replacement control units that use exactly the same settings The transfer of data between the RZD20 and the internal data storage is accomplished with the Get_Par and SavePar commands on programming level 7 refer to Pro gramming Micro computer RVW26 SavePar Data storage module RZD20 Data storage internally Get_Par 78731e01e 1001 Micro computer RVW26 Data storage modu...

Страница 36: ... transferred to the replacement unit by taking the following steps 1 Remove the data storage module from the old unit 2 Plug the data storage module into the new unit 3 Insert the new unit into the housing and switch on mains voltage 4 Plug in the handheld terminal AZW20 20 5 Execute command Get_Par on programming level 7 6 Execute command ClrErro on programming level 7 7 Measure again the end swi...

Страница 37: ...display shows the respective error message in clear text The RVW26 initiates lockout and must be reactivated by making a reset or by using the handheld terminal b Fault in programming mode Same as under a but the display of the handheld terminal only shows an E in the first column of the fourth line The parameters can still be set however The error message can be displayed in clear text by changin...

Страница 38: ...eters Internal faults are Faults detected by the RVW26 when testing the hardware Faults detected by the RVW26 when testing its program and data memories Inadmissible programming Since each and every fault can have consequences from a safety point of view the RVW26 rates both types of faults equal If a fault occurs the control unit will always initiate lockout Note For diagnostic purposes it may be...

Страница 39: ...ombination Check connecting wires between burner control and RVW26 for false wiring loose wires short circuits or inadmissible contactor con tacts Measure voltages at Y10 and Y20 If one of the voltages is inside the inadmissible range 50 187 V the outputs of the load con troller must be decoupled with relays 09 change sign FA Signal combinations inadmissible in terms of time were detected on the s...

Страница 40: ... limits of 0 4 9 6 V Check wiring of the feedback potentiometer and feedback potentiometer itself Replace it if necessary 22 23 act slow aux1 act slow aux2 The RVW26 monitors the change on the feedback potentiometer when a positioning step is made The change in position measured was smaller than expected Check whether the set actuator running time agrees with the real running time Check the potent...

Страница 41: ...ed Remedy Check shielding of the lines to the feedback potentiometers Error code displayed by the unit Text displayed by the hand held terminal Hints on the cause of the fault Hints on troubleshooting 30 lin ad convert 31 superpos load 32 superpos aux1 33 superpos aux2 34 pos contr load 35 pos contr aux1 36 pos contr aux2 37 disturb check 38 controll rel 1 39 controll rel 2 40 line input bit 41 su...

Страница 42: ...ls of the RVW25 are executed to ensure the burner continues to op erate together with air fuel ratio control output adjustments with the handheld terminal on programming level 5 are not possible To set the curves in this mode 2 AZW20 20 are required one for the RVW25 and one for the RVW26 The operator is now in control of the burner and the programmed load positions can be changed by him When duri...

Страница 43: ...1 Functions Fuel 2 4 4 System configuration 2 3 Measuring end switches Fuel 1 2 2 Measuring end switches Fuel 2 System configuration 1 1 Operating mode 0 F 7 6 5 4 3 2 1 0 Fig 23 Structure of the programming levels Within each programming level buttons D and Ñ are used to select the required parameter Buttons and are used to change the selected parameters The first column on the display continuous...

Страница 44: ...r has been selected actuator is still traveling parameter can be changed Parameter can be changed without having an impact on the burner e g to check the programmed data Ready for burner start Start of fan and end switch test Actuators open fan runs up to maximum speed Prepurging Approaching ignition positions Waiting for fuel release Interval Aproaching low fire or ignition load Operating positio...

Страница 45: ...to off no more Aux2 parameters will appear on the other programming levels Setting range on off Factory setting off Aux1Tim Running time of auxiliary actuator 1 Setting range 30 60 s Increment 5 s Factory setting 30 s Aux2Tim Running time of auxiliary actuator 2 Setting range 30 60s Increment 5 s Factory setting 30 s The running time to be set is the period of time the actuator would require to mo...

Страница 46: ... currently stored can be displayed by pressing and If D or Ñ is pressed the status character changes from to The selected end switch positions Open or Close will be approached and stored Once the values are stored the status character changes to The other end switch position can now be measured by pressing or Settings open close Aux1Pos End switch of auxiliary actuator 1 Aux1 in Volt Factory setti...

Страница 47: ... mode pa rameter SetPts automatically changes to 9 Each time a curvepoint is changed with setting 5 or 9 the intermediate values will be calculated by the RVW26 Disturb Impact of the correcting variable refe to chapter Application of a correcting vari able Setting range 0 50 Increment 1 Factory setting 0 Aux2Dis Impact of correcting variable on auxiliary actuator 2 Parameter Aux2Dis must be set to...

Страница 48: ...the RVW25 and 1 for the RVW26 or a changeover switch KF8879 are required To ensure a correct link of the actuators the RVW26 follows the load signal of the RVW25 in programming mode also To optimize a curvepoint it must be approached with the RVW25 e g with the help of an AZW20 20 and can only then be correctly set with the RVW26 If the breakpoint lies outside the load limits the actuators will be...

Страница 49: ... 04 V Factory setting 0 V Aux2Pos Position of auxiliary actuator 2 on ignition Setting range end switch_closed end switch_tolerance hysteresis end switch_open end switch_tolerance Increment 0 04 V Factory setting 0 V Data transfer 7 G e t _ P a r o f f 9 S a v e P a r o f f 1 C l r E r r o o f f Parameter Meaning Get_Par Loading data from the external data storage module refer to chapter Data stor...

Страница 50: ...r 9 1 n o e r r o r s Parameter Meaning Error Fault code refer to chapter Fault code table with hints on troubleshooting If several faults are present at the same time they will be displayed one by one The order of their occurrence cannot be read off Line 3 of the display gives a brief description of the fault in English Programming level F Display Interpretation ...

Страница 51: ...enerator W Limit thermostat or pressure switch The following contacts are included in the burner control s start control loop terminals 4 5 Readiness contact Q4 Q5 of the RVW25 and RVW26 The burner s on off contact Q13 Q14 of the load controller Limit thermostat W or gas pressure switch In the event of lockout the RVW25 and the RVW26 can be reset by pressing lock out reset button EK in the supply ...

Страница 52: ...M RVW26 Q5 Q1 Y20 Y10 L Q3 U10 B4 M Y5 Y6 AUX2 U10 B2 M Y3 Y4 AUX1 1 2 SA5 SA7 Q2 N H 1 2 M F1 1K9 Y8 M AL2 78731f05 0801 X3 M FU 1K8 M X3 U1 M U3 Q3B 1K4 S1 F1 F2 1K2 1K4 F1 F2 F2 Q7 X2 GND RPO25 F1 F2 Q3 Q2B Q2A Q6 X2 X2 U1 DC Power Start Stop M In 0 10 V 1K9 EK 1K2 1K4 1K4 Q4 Q4 AGK34 TG Y7 1K8 P LP 1K2 BV F2 18 1K2 BV F1 TXD RXD GND TXD RXD GND Fig 27 Basic diagram with O2 trim control The fol...

Страница 53: ...s eliminating the need for intermediate linkage The total running time of the actuators corresponding to DC 0 10 V at the feedback potentiometer must be in the range between 20 and 120 seconds but the running times of the individual actuators may vary It is of advantage to use valves and dampers with a characteristic as close as possible to equal percentage The ramp time corresponding to the full ...

Страница 54: ...o a large percentage change in air volume This may lead to problems in connection with O2 trim control When installing the actuators according to the wiring diagrams released by this prod ucts the actuators are in their Fully closed position when the burner is shut down If an actuator shall be in its Fully open position when the burner is shut down The control outputs on off must be interchanged T...

Страница 55: ...e shielded including those in the control panel The shielding must be connected on only one side namely to terminal M of the RVW26 It must never be connected on the actuator side There must be no electrical connection between terminals N and M and between M and PE The maximum permissible line length is 100 m The lines to terminal X2 application of correcting variable and to terminal U1 analog inpu...

Страница 56: ...e a separate approval procedure is required The mechanical link between actuator spindle and feedback potentiometer must be rigid with no mechanical play The reproducibility of the end switch position must be better than 2 of the po sitioning range The backlash of the actuator s geartrain must be less than 2 of the positioning range 2 of the positioning range correspond to 1 8 in the case of a 90 ...

Страница 57: ... wiper must be able to carry a current of 0 1 mA The electrical contact must also be suited for very small currents 78721d07 0501 U10 B M I 0 1 mA RVW25 Fig 39 Required contact rating of the potentiometer wiper The potentiometer should be capable of exceeding 1 million cycles Since the above requirements cannot be met with wire potentiometers this products uses special conductive plastic potentiom...

Страница 58: ...e and the fan speed feedback signal The variable speed drive controls the amount of combustion air via the fan speed Based on the feedback signal received the RVW26 controls the fan speed To ensure constant and steady combustion accurate fan variable speed drive is very important To provide control the variable speed drive must have the following inputs Analog input DC 0 10 V Start stop ...

Страница 59: ...02 0601 A U10 M Y3 B1 Y4 Z P M 0 Fig 28 Actuator with feedback potentiometer Careful and correct adjustment of the end switches and potentiometers is extremely important The steps indicated below are useless if this work has not been carried out correctly Connect the handheld unit AZW20 20 and switch the RVW26 to programming mode Plants with O2 trim control or with application of a correcting vari...

Страница 60: ...ity of 1 MW This output requires an oil throughput of 90 kg h With the help of a graph the required oil throughput can be ascertained for each curve point At each curvepoint the fuel actuator is now to be set for the respective amount of fuel Then the air damper actuator is to be set to produce the required amount of excess air e g with CO2 O2 or CO measurements The setting should be made such tha...

Страница 61: ... 2 different ways to adjust the curves for the air and fuel value in relation to the burner load A Curve adjustment by determining the amount of fuel accurate but complex Procedure 1 Determine the amount of fuel at maximum burner output 2 Calculate the amount of fuel for each load point 3 Start the burner with the basic adjustment 4 First adjust the required load point for the calculated amount of...

Страница 62: ... 40 2 20 2 00 Number l Output P 1 24 1 22 1 21 1 19 1 18 1 17 1 15 1 14 1 13 1 12 1 11 100 4 00 3 80 3 60 3 40 3 20 3 00 2 80 2 60 2 40 2 20 2 00 93 75 5 06 4 87 4 68 4 49 4 31 4 12 3 93 3 74 3 56 3 37 3 18 87 50 5 13 4 94 4 75 4 57 4 38 4 19 4 01 3 82 3 63 3 46 3 26 81 25 5 21 5 02 4 84 4 65 4 46 4 28 4 09 3 91 3 72 3 54 3 35 75 00 5 30 5 12 4 93 4 75 4 56 4 38 4 19 4 01 3 82 3 64 3 45 68 75 5 41...

Страница 63: ...s load point 6 Reduce FuelPos until the O2 value of 3 26 is reached The O2 value is reached at FuelPos 7 18 7 Reduce Air_Pos until the O2 value of 2 2 is reached because the level of ex cess air shall be higher This is the case at Air_Pos 8 40 With the next setting the column with the O2 setpoint of 2 20 applies 8 Set the load points until the minimum output is reached following the same proce dur...

Страница 64: ...iary actuator Y5 Y6 Aux2Act on off Interval t4 Interva s Running time of auxiliary actuator 1 AUX1 Aux1Tim s s Running time of auxiliary actuator 2 AUX2 Aux2Tim s Position of end switches Fully closed Close Aux1Pos V V Aux2Pos V Position of end switches Fully open Open Aux1Pos V V Aux2Pos V Compensation of hysteresis Hyster V V Impact of correcting variable Disturb s Impact of correcting variable ...

Страница 65: ... 3 62 5 68 8 75 0 81 3 87 5 93 8 100 Ignition load IgnitLo Position of auxiliary actuator 1 on ignition Aux1Pos V Position of auxiliary actuator 2 on ignition Aux2Pos V Fuel 2 Load Burner output Air_Pos V Position air FuelPos V Position fuel Aux_Pos V Position auxiliary actuator 0 0 6 3 12 5 18 8 25 0 31 3 37 5 43 8 50 0 56 3 62 5 68 8 75 0 81 3 87 5 93 8 100 Ignition load IgnitLo Position of auxi...

Страница 66: ...the commissioning of a burner 15 10 2002 Anlage Plant Installation Brennstoff Fuel Combustible Regelorgan Regulating unit Organ de réglage Datum Date Date Load 1 2 3 4 5 6 7 8 9 10 0 Position V 0 0 12 5 25 0 37 5 50 0 62 5 75 0 87 5 100 0 6 3 18 8 31 3 43 8 56 3 68 8 81 3 93 8 Durchsatz Throughput Débit 78731t01 0601 ...

Страница 67: ... x a m p l e April 2000 EZ End switch fully closed EA End switch fully open ZL Ignition load KL Low fire NL High fire Gas damper Gas Heating plant Landis Staefa Position V Load 1 2 3 4 5 6 7 8 9 10 0 0 0 12 5 25 0 37 5 50 0 62 5 75 0 87 5 100 0 6 3 18 8 31 3 43 8 56 3 68 8 81 3 93 8 Throughput 19 2 25 1 30 9 36 1 42 7 51 0 57 1 62 0 69 2 76 1 83 5 90 6 92 5 G a s EA EZ m h 3 78731t02e 1002 ...

Страница 68: ...ntrol outputs Y3 Y6 Y8 Voltage Current operating voltage 5 150 mAeff Control inputs Q2 Q3 Y10 Y20 F1 F2 Voltage ON Voltage OFF Current ON AC 187 265 V AC 50 V approx 0 4 mA Signal inputs B1 B4 U1 Voltage Impedance Perm humming voltage DC 0 10 V 130 KW max AC 50 mV Signal output X2 U3 Voltage Impedance DC 0 10 V 25 KW Signal output U10 Voltage Current DC 10 V max 50 mA Signal output X1 Voltage Impe...

Страница 69: ...721 3 2 Climatic conditions class 2K2 Mechanical conditions class 2M2 Temperature range 25 70 C Humidity 95 r h Operation DIN EN 60 721 3 3 Climatic conditions class 3K5 Mechanical conditions class 3M2 Temperature range 0 60 C Humidity 95 r h Condensation formation of ice and ingress of water are not permitted Environmental conditions Siemens Building Technologies Landis Staefa Produktion GmbH Ber...

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