Siemens 7MC3052-1AB63 Скачать руководство пользователя страница 39 | Manualshive

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Siemens 7MC3052-1AB63 Скачать руководство пользователя страница 39

33

Operating instructions

1

2

3

4

5

OUT2

[mA]

t

1: Measuring object in front of pyrometer

2: Hold time

3: Measurement time of the second internal peak value memory

4: Measuring readings with peak hold function

5: Measuring readings without peak hold function

14.4 DTD function (Discontinuous Temperature Detection)

This function serves to automatically detect the temperature during manufacturing

processes with discontinuous or intermittent material flow. For example, thus can

determine the temperature of bolts with variable lengths, that move acyclic along

the pyrometer. A temperature threshold has to be defined for this purpose. The

measurement starts when the object temperature is higher than the set threshold.
• [

Q

] → [

Q.MEM

] = [

DTD

]

The measurement stops when the threshold is violated and the maximum value is

available at the analogue output.

The reset point is 5 K below the parameterised threshold.

In parallel, a sync pulse is given to OUT2. OUT2 is switching when the threshold is

exceeded, depending on the parameters set. If the value falls below the threshold,

OUT2 returns to its previous state.
• [

d2

] → [

d2.S

] = [

Sync.

]

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Содержание 7MC3052-1AB63

Страница 1: ...Two colour pyrometer 7MC3052 Operating instructions 06 2017 ...

Страница 2: ......

Страница 3: ...Operating instructions SIEMENS Two colour pyrometer 7MC3052 Ident no 1087381 English 06 17 ...

Страница 4: ...chließlich Speicherung und jede Übertragung auf Papier Transparente Filme Bänder Platten und andere Medien Hinweis Soweit auf den einzelnen Seiten dieser Bedienungsanleitung nichts anderes vermerkt ist bleiben technische Änderungen insbesondere die dem Fortschritt dienen vorbehalten SIEMENS AG Industry Sector DF CS SD OP ITM Günther Scharowsky Str 2 D 91058 Erlangen GERMANY Tel 49 0 9131 7 33310 F...

Страница 5: ...urement 5 16 Function 6 6 1 Analogue output 6 6 2 Switching threshold OUT1 7 6 3 Output signal 7 6 4 Upper threshold delay 7 6 5 Lower threshold delay 8 6 6 Switching functions 8 6 7 Internal signal processing 8 6 8 Switching threshold OUT2 9 6 9 Dirt alert 9 6 10 Sync pulse 10 6 11 Inner device temperature 10 6 12 Output signal 10 6 13 Upper threshold delay 10 6 14 Lower threshold delay 11 6 15 S...

Страница 6: ...lour mode 24 11 5 Measurement acquisition one colour mode 25 11 6 Advanced Features 25 12 Setup 26 12 1 Two colour mode 26 12 2 One colour mode 27 13 Aligning and focusing the fiber optic head 28 13 1 Safety instructions and precautions 29 14 Operating parameters 30 14 1 Setting parameters general information 30 14 2 Damping function 31 14 3 Peak hold function 32 14 4 DTD function 33 14 5 Reset al...

Страница 7: ...settings 54 24 Copyright 56 1 Product numbers Pyrometer Temperature range Product number PK 68 AF 1 MB 550 1400 C D 70 1 7MC3052 1AB68 PKF 66 AF 1 MB 700 1800 C D 190 1 7MC3052 1AB66 PKF 66 AF 2 MB 700 1800 C D 190 1 7MC3052 1AC66 PKF 66 AF 3 MB 700 1800 C D 100 1 7MC3052 1AD66 PKF 66 AF 4 MB 700 1800 C D 50 1 7MC3052 1AE66 PKF 66 AF 5 MB 700 1800 C D 225 1 7MC3052 1AF66 PKF 67 AF 5 MB 600 1400 C ...

Страница 8: ...This symbol points out guidelines If you do not observe them the device might be damaged malfunctioning or even fail to operate CAUTION This symbol points out hints and information which should be heeded for efficient and trouble free operation Action This symbol instructs the operator to take action Reaction Result This symbol indicates the result of the action taken 2 3 Liability and Warranty Al...

Страница 9: ...for use as described in this manual Operational safety can only be ensured when the instrument is used for its intended purpose The use of the pyrometer for any other purpose beyond what is specified in this manual is prohibited Using the instrument in any other manner will be considered as improper The Manufacturer Authorised Agent shall not be held liable for any dama ges or loss resulting from ...

Страница 10: ...and converts this to an electric switch signal The advantage of this technique is that there is no mechanical contact between the sensor and the hot object The instrument is suitable for the following applications Measurements at moving or hard to reach objects Measurements at surface treated or voltage carrying objects Measurements at sticky materials such as dough or aggressive chemicals Applica...

Страница 11: ... objects openings screens or viewing windows that reduce energy and by dirt smoke or steam in the atmosphere The two color mode can also be used on targets that do not com pletely fill the target spot provided the background is much cooler than the target Two colour pyrometer Type Temp range Focus distance Measuring field size LED spot light 7MC3052 1AB68 550 1400 C 1 5 m Ø 21 mm no 7MC3052 1AB66 ...

Страница 12: ...n be used The following sources are available Two colour mode Ao Ao S QUot One colour mode Ao Ao S SpEc Within the overall measuring range the required measuring range can be set to C or F using parameter Ao _ scale beginning and parameter Ao scale end There is also the possibility to switch OUT2 between 0 20 mA and 4 20 mA Scale beginning Ao Ao _ Scale end Ao Ao Change 0 4 20 mA Ao Ao 04 0 20 4 2...

Страница 13: ...rP would then fall below its minimum value the d1 rP is kept with its minimum value If d1 SP subsequently increases again d1 rP also immediately increas es The minimum distance between d1 SP and d1 rP is 2 K 6 3 Output signal The following switching functions can be selected Normally open contact d1 d1 Fn no normally open Normally closed contact d1 d1 Fn nc normally closed 6 4 Upper threshold dela...

Страница 14: ...nstream control system Lower threshold delay d1 d1 dr 0 10 sec 6 6 Switching functions 1 Temperature profile 2 Switch signal Hno 3 Switch signal Hno with upper and lower threshold delay 4 Switch signal Hnc 5 Switch signal Hnc with upper and lower threshold delay 6 7 Internal signal processing Temperature Switch point no nc Lower upper threshold delay Switching ...

Страница 15: ...ass or the sighting cone of the pyrometer gets dirty during a measurement The dirt alert is activated with parameter d2 d2 s DirT The dirt alert is a warning function This warning will become active when the set threshold q q drt During measurements of discontinuous processes this warning is only active when the target object is detected by the pyrometer and the thresh old is violated target objec...

Страница 16: ...rnal temperature is 70 C the switching output OUT 2 switches back to its original state 6 12 Output signal The following switching functions can be selected for dirt alert signal strength and inner device temperature Normally open contact d2 d2 Fn no normally open Normally closed contact d2 d2 Fn nc normally closed 6 13 Upper threshold delay Once the sensor has detected a temperature which exceeds...

Страница 17: ...efficient continues to be adjusted in the background This is an easy way to determine the emissivity when the object temperature is known The changed values are directly adopted 6 16 Emissivity of materials one colour mode The pyrometer reacts to the thermal energy infrared radiation emitted by an object The ability to radiate heat depends on the type of material and its surface properties A descr...

Страница 18: ... lens and or protective window screwed onto the pyrometer Set the pyrometer for the specific transmission factor a percentage value which is indicated either in the product s data sheet or on the lens itself If you are not using any auxiliary lens or protective window set the parameter to 100 0 Transmission factor S S tAU 100 0 6 18 IO Link This device has an IO Link communication interface which ...

Страница 19: ...rding to the following schematic 2 3 1 4 5 1 4 L L 24VDC 5 C Q 2 0 4 20mA Out2 3 shielded Pin 1 BN brown L Power supply 24V DC Pin 4 BK black Open Collector switching output Imax 150 mAOUT1 or IO Link Pin 5 GY grey Open Collector switching output Imax 150 mA OUT2 Pin 2 WH white Analogue output 0 4 20mA Pin 3 BU blue L Shield The pyrometer must be protected against high voltage and strong electro m...

Страница 20: ...rrent to flow between devices through a cable shielded at both ends In this case be sure to install an additional equipotential bonding line To avoid an equalising current the pyrometer can be mounted electrically insulated The shielding must be connected to the plant s earthing system If the pyrometer is installed without an insulator and with out potential equalisation the interference voltage m...

Страница 21: ... temperature 1 to 3 Indicator LEDs LED 1 indicates switching output OUT1 LED 2 indicates switching output OUT2 LED 3 signal strength 4 Control key Enter Select parameter and confirm setting 5 Control key up and down Adjust configuration parameters 6 Alphanumeric display 4 digit Indicates temperature value Indicates parameters and configuration Indicates overload at switching output ...

Страница 22: ...16 Operating instructions 10 Menu 10 1 Process value display lock unlock display shows Loc uLoc 10 2 Analogue output Menu is not available when key lock is active Display Adjustment ...

Страница 23: ...17 Operating instructions 10 3 Switching threshold OUT1 Menu is not available when key lock is active Display Adjustment ...

Страница 24: ...18 Operating instructions 10 4 Switching threshold OUT2 ...

Страница 25: ...19 Operating instructions 10 5 Two colour mode Menu is not available when key lock is active Display Adjustment ...

Страница 26: ...20 Operating instructions 10 6 One colour mode Menu is not available when key lock is active Display Adjustment ...

Страница 27: ...21 Operating instructions 10 7 Advanced Features Menu is not available when key lock is active Display Adjustment ...

Страница 28: ...caling Ao 04 Analogue output 0 4 20 mA 0 20 mA scaling Analogue output 4 20 mA scaling Analogue output End End 11 2 Switching threshold OUT1 Parameter Function Explanation d1 S OUT1 source QUot two colour mode SPEc one colour mode d1 SP OUT1 Upper threshold Upper threshold which activates OUT1 d1 rp OUT1 Lower threshold Lower threshold which activates OUT1 D1 Fn Output function nc normally closed ...

Страница 29: ... dirt alert Sync sync pulse d2 SP OUT2 Upper threshold Upper threshold which activates OUT2 d2 rP OUT2 Lower threshold Lower threshold which activates OUT2 D1 Fn Output function no normallly closed nc normally open D1 ds Upper threshold delay Value in sec 10 sec in steps of 0 1 D1 dr Lower threshold delay Value in sec 10 sec in steps of 0 1 End End Only available with DTD function ...

Страница 30: ...no Display mode during sampling time T 0 show lower limit of temp range during running measurement t hld Hold previous temp reading during running measurement Q dAP Damping after min max memory Off off time t98 0 999 9 sec in 0 1 sec steps Q drt Pollution warning level Value in 0 1 100 Q LiM switch off threshold Value in 0 1 100 Q Si6 Q signal intensity Calculated signal intensity in Q tMP Q tempe...

Страница 31: ... steps S dAP Damping after min max memory Off off Time in sec in 0 1 sec steps S tMP One colour temperature reading One colour temperature reading End End Menu item only if Peakhold is activated 11 6 Advanced Features Parameter Function Explanation diSP Process value display On current temperature value Off run is shown in the display Unit Temperature unit oC oF t SiN Temperature simulation A temp...

Страница 32: ...ated for this signal LED 3 lights up Measurement OK LED 3 flashes Signal strength below the set threshold measurement is critical LED 3 off The signal strength is too low a measurement is not possible Set the pyrometer to two colour mode Default Two colour Ao Ao S Quot Align the pyrometer to the object to be measured Sighting hole smaller than th epyromter field of view Emitted radiation Dust stea...

Страница 33: ...ivity coefficient tables An incorrectly set emissivity coefficient leads to wrong temperature readings Set the emissivity coefficient after connecting the supply voltage or resetting the parameters to factory settings Press or the value of the selected emissivity is displayed for example 100 0 Press or until the desired emissivity is shown Press Enter or wait for 3 seconds The current temperature ...

Страница 34: ... adjustment loosen the shown socket screw hexagon socket screw DIN 916 with a wrench DIN 911 and shift the internal body of the tube towards the lens tube Due to the O ring sealing between the internal body of the tube and the lens tube the focal adjustment must be carried out very slowly so that the air pressure in the space between lens and internal body of the tube can be be equalised Focus the...

Страница 35: ...leave the instrument unattended when the laser is activated Do not point the laser beam at any person During pyrometer installation and alignment make sure to avoid the possibility of laser light reflections caused by reflective surfaces All currently valid laser safety standards must be observed Laser Power The laser operates at a wavelength of 630 670 nm visible red light The emitted power of th...

Страница 36: ...ss Enter to access the main menu 2 Select output function Press key until the required output function or the Advanced Features is displayed 3 Show parameter value Press Enter Current parameter value is displayed The pyrometer will display the parameter value for 30 sec After that the display will once again indicate the measurement as a percentage 4 Change parameter value Press ENTER for 2 second...

Страница 37: ...e parameter End then press Enter The instrument features a keylock Activate deactivate the keylock as follows Press key simultaneously and hold them down for 10 sec The display shows Loc or uLoc for 1 second to signalize the change If you press both keys only briefly you will exit the layer ESC function 14 2 Damping function When the target object s temperature is erratic the damping function smoo...

Страница 38: ...mperature readings which would appear to be cyclical In this mode the displayed temperature reading will not drop between targeted objects The peak temperature reading will be held for a preset time period The hold time PhLd can be set from 0 1 to 999 9 sec The maximum temperature sampled during the defined hold time will be saved It makes sense to choose a hold time which is approximately 1 5 tim...

Страница 39: ...For example thus can determine the temperature of bolts with variable lengths that move acyclic along the pyrometer A temperature threshold has to be defined for this purpose The measurement starts when the object temperature is higher than the set threshold Q Q MEM DTD The measurement stops when the threshold is violated and the maximum value is available at the analogue output The reset point is...

Страница 40: ...asurement the previous read ing is available at the temperature output d2 q Ano t 0 During the measurement the temperature is set to the lower limit of the temperature range 1 Measuring object in front of pyrometer 2 Limit DTD 3 Temperature output q Ano t 0 4 Previous reading 5 Lower limit of temperature range 6 New reading 7 Temperature output q Ano t hld ...

Страница 41: ...p to obtain exact measuring results 15 Operation After connecting the supply voltage the pyrometer will be automatically initialized and will perform a self diagnosis After approx 0 5 sec the sensor is ready to operate and the instrument runs the signal processing The parameters are described in chapter 10 page 25 15 1 Ambient temperature The maximum permissible ambient operating temperature for t...

Страница 42: ...All materials radiate thermal energy in all states of aggregation above absolute zero This radiation is mainly caused by atomic or molecular oscillations This temperature radiation is only a limited sector within the total electromagnetic radiation spectrum It extends from the visible range starting at wavelengths of approx 0 5 μm to the infrared range with wavelenghs of more than 40 μm Radia tion...

Страница 43: ...at any wavelength the maximum energy possible for the specific temperature Real bodies do not have this ability In other words a black body completely absorbs the radiation without reflection or transmission losses The spectral emissivity coefficient e of a black body is equal to 1 or 100 The emissivity coefficient indicates the ratio of radiation of a real body target to the radiation of an ideal...

Страница 44: ...objects then have to be shaded This effect is particularly to be observed in the measurement of a colder object within a hot oven 17 Ways to determine emissivity Technical literature or operating manuals often contain data on the emissivity of various materials This information should be used with caution however It is important to know for which temperature and which wavelength the emissivity val...

Страница 45: ...ious measurement reading again 17 1 Emissivity Table One colour mode Overview of the emissivities of different materials in Model 7MC3052 Wavelength λ 0 8 1 1 μm Black Body 100 Aluminium polished 15 Aluminium blackened 25 Asbestos cement 70 Bronce polished 3 Bronze blackened 30 Chromium polished 30 Iron heavily scaled 95 Iron rolling skin 90 Iron liquid 30 Gold and silver 2 Graphite blackened 90 C...

Страница 46: ... Inspection after shipping Unpack and inspect the entire shipment immediately upon receipt to make sure it is complete and undamaged If the container package shows visible signs of damage please refuse the shipment If this is not possible accept the shipment on the condition that the freight carrier s delivery record is noted with the extent of the damage in order to file a claim Should you discov...

Страница 47: ...g jacket PK 01 B AF 1 1067753 Bayonet coupling PS 11 N AF 4 561585 90 Deflection mirror PS 11 W 561955 Supplementary tube ZA 01 Q 35 514234 Intermediate tube ZA 01 M 513807 Intermediate tube ZA 01 B 513596 Intermediate tube ZA 01 Q AF 2 515528 Clamping collar with angle PS 11 K 35 AF 2 561558 Mounting bracket PS 11 U 561537 Flange PS 01 N 513303 Flange ZA 01 I 513533 Flange ZA 01 W 514831 Flange D...

Страница 48: ...te COM2 38 400 Baud Storage temperature 20 80 C Permissible humidity 95 r H max non condensing Power requirement 24 V DC 10 20 Ripple 200 mV Housing material Stainless steel Weight approx 0 4 kg Connectivity 5 pin connection M12 A coded Protection IP 65 according to DIN 40050 with screwed plug Configuration parameters Emissivity ratio 80 120 Emissivity ε 10 110 Smoothing function t98 before Max mi...

Страница 49: ...olution temp reading 1 K Response time t90 10 ms for T 650 C Repeatability 2 K Measurement uncertainty 1 0 of temp reading C Temperature coefficient 0 05 K of temp reading K deviation to Tu 23 C Ambient temperature 0 65 C Current consumption 50 mA at 24 V DC without load current Dimensions M30 x 210 mm without plug Target diameter mm Energy Target distance mm 0 100 200 300 400 500 1000 1500 2000 2...

Страница 50: ...Resolution temp reading 1 K Response time t90 10 ms for T 800 C Repeatability 2 K Measurement uncertainty 1 0 of temp reading C plus 3 0 K Temperature coefficient 0 05 K of temp reading K deviation to Tu 23 C Ambient temperature 0 65 C Current consumption 50 mA at 24 V DC without load current Dimensions M30 x 200 mm without plug Target diameter mm Energy PA41 01 0 2 m Target distance m 0 1 2 3 4 5...

Страница 51: ...e time t90 10 ms for T 800 C Repeatability 2 K Measurement uncertainty 1 0 of temp reading C plus 3 0 K Temperature coefficient 0 05 K of temp reading K deviation to Tu 23 C Ambient temperature 0 65 C Current consumption 50 mA at 24 V DC without load current Dimensions M30 x 200 mm without plug Target diameter mm Energy Target distance m 0 0 1 0 2 0 3 0 4 0 5 1 08 2 2 5 3 5 4 5 4 3 5 21 4 19 9 18 ...

Страница 52: ...solution temp reading 1 K Response time t90 10 ms for T 800 C Repeatability 2 K Measurement uncertainty 1 0 of temp reading C plus 3 0 K Temperature coefficient 0 05 K of temp reading K deviation to Tu 23 C Ambient temperature 0 65 C Current consumption 50 mA at 24 V DC without load current Dimensions M30 x 200 mm without plug Target diameter mm Energy Target distance m PA41 05 0 12 m 0 1 2 3 4 5 ...

Страница 53: ...tion temp reading 1 K Response time t90 10 ms for T 800 C Repeatability 2 K Measurement uncertainty 1 0 of temp reading C plus 3 0 K Temperature coefficient 0 05 K of temp reading K deviation to Tu 23 C Ambient temperature 0 65 C Current consumption 50 mA at 24 V DC without load current Dimensions M30 x 200 mm without plug Target diameter mm Energy Target distance mm 33 34 35 36 37 38 39 40 41 42 ...

Страница 54: ... time t90 10 ms for T 800 C Repeatability 2 K Measurement uncertainty 1 0 of temp reading C plus 3 0 K Temperature coefficient 0 05 K of temp reading K deviation to Tu 23 C Ambient temperature 0 65 C Current consumption 50 mA at 24 V DC without load current Dimensions M30 x 200 mm without plug Target diameter mm Energy Target distance m 0 0 1 0 2 0 3 0 4 0 5 1 1 5 2 2 5 3 5 4 5 4 3 5 9 2 9 3 9 4 9...

Страница 55: ... for T 700 C Repeatability 2 K Measurement uncertainty 1 0 of temp reading C plus 3 0 K Temperature coefficient 0 05 K of temp reading K deviation to Tu 23 C Ambient temperature 0 65 C Current consumption 50 mA at 24 V DC without load current Dimensions M30 x 200 mm without plug Target diameter mm Energy Target distance m 95 90 PA41 03 1 8 m 0 100 200 300 400 500 1000 1800 2500 3000 5000 4500 4000...

Страница 56: ...e t90 10 ms for T 750 C Repeatability 3 K Measurement uncertainty 1 5 of temp reading C Temperature coefficient 0 05 K of temp reading K deviation to Tu 23 C Ambient temperature 0 65 C in sum of load currents Do1 and Do2 150 mA otherwise 0 60 C Current consumption 75 mA at 24 V DC without load current Dimensions M30 x 235 mm without plug Target diameter mm Energy Target distance mm LED 90 Ø 5 4 9 ...

Страница 57: ... ms for T 750 C Repeatability 3 K Measurement uncertainty 1 5 of temp reading C Temperature coefficient 0 05 K of temp reading K deviation to Tu 23 C Ambient temperature 0 65 C in sum of load currents Do1 and Do2 150 mA otherwise 0 60 C Current consumption 75 mA at 24 V DC without load current Dimensions M30 x 235 mm without plug Target diameter mm Energy Target distance mm LED 90 76 0 32 5 13 5 6...

Страница 58: ...Repeatability 2 K Measurement uncertainty 1 0 of temp reading C Temperature coefficient 0 05 K of temp reading K deviation to Tu 23 C Ambient temperature 0 65 C in sum of load currents Do1 and Do2 150 mA otherwise 0 60 C Current consumption 75 mA at 24 V DC without load current Dimensions M30 x 235 mm without plug Target diameter mm Energy Target distance mm 0 35 70 105 140 175 210 245 280 315 350...

Страница 59: ... Repeatability 2 K Measurement uncertainty 1 0 of temp reading C Temperature coefficient 0 05 K of temp reading K deviation to Tu 23 C Ambient temperature 0 65 C in sum of load currents Do1 and Do2 150 mA otherwise 0 60 C Current consumption 75 mA at 24 V DC without load current Dimensions M30 x 235 mm without plug Target diameter mm Energy Target distance mm 0 200 400 600 800 1000 1200 1400 1600 ...

Страница 60: ..._ 550 C 700 C 700 C 650 C 650 C Ao 1400 C 1800 C 1800 C 1600 C 1600 C Ao 04 4 20mA 4 20mA 4 20mA 4 20mA 4 20mA d1 d1 S quot quot quot quot quot d1 SP 770 C 980 C 980 C 890 C 890 C d1 rP 750 C 950 C 950 C 870 C 870 C d1 FN no no no no no d1 dS oFF oFF oFF oFF oFF d1 dr oFF oFF oFF oFF oFF d2 d2 S tu Hi tu Hi tu Hi tu Hi tu Hi d2 fn no no no no no d2 dS oFF oFF oFF oFF oFF d2 dr oFF oFF oFF oFF oFF ...

Страница 61: ...FF oFF q Phd 0 1 0 1 0 1 0 1 0 1 q dtd 550 550 550 650 650 q Ano t hld t hld t hld t hld t hld q dAP 0 1 0 1 0 1 0 1 0 1 q drt 50 0 50 0 50 0 50 0 50 0 q liN 10 0 10 0 10 0 10 0 10 0 s s Eps 100 100 100 100 100 s tAU 100 0 100 0 100 0 100 0 100 0 s NEN oFF oFF oFF oFF oFF s Phd 0 1 0 1 0 1 0 1 0 1 s dAp 0 1 0 1 0 1 0 1 0 1 EF diSP on on on on on Unit C C C C C t siN 550 700 600 650 650 rEs Stop St...

Страница 62: ... AND CONTRIBUTORS AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PAR TICULAR PURPOSE ARE DISCLAIMED IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT INDIRECT INCIDENTAL SPECIAL EXEMPLARY OR CONSEQUENTIAL DAMAGES INCLUDING BUT NOT LIMITED TO PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES...

Страница 63: ......

Страница 64: ...OP ITM Tel 49 911 750 9600 Fax 49 911 750 9609 Email sirent industry siemens com Office Testing Warehouse Counter service Breslauer Str 5 Gundelfinger Str 20 90766 Fürth 90451 Nürnberg Germany Germany http www siemens com sirent Subject to change without notice ...

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