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MC2-30M

Doc. N°

MO-0495-ING

Date

17.03.2022

Rev.

Pag. 39

17.10 - Function:

1Io>

(First Earth Fault Element 50N/51N)

Status

→

Enab

Yes

[No / Yes]

Options

→

f(t)

Type - D

[D / A / B / C / I / VI / EI / MI / SI]

→

tBI

Off

[Off / 2tBO]

Oper.Levels

→

0.01

(0.01

step 0.01 On

Timers

→

100

(0.02

100)

step

0.01 s

→

tBO

0.75

(0.05

0.75)

step

0.01 s

On = Rated primary current of CTs or of the current Tore CT.

17.10.1 - Description of variables

Enab.

: Function enabling (No = Disable / Yes = Enable)

f(t)

: Operation characteristic (Time/Current curve):

(D)

= Independent definite time

(A)

= IEC Inverse Curve type A

(B)

= IEC Very Inverse Curve type B

(C)

= IEC Extremely Inverse Curve type C

(I)

= IEEE Inverse Curve

(VI)

= IEEE Very Inverse Curve

(EI)

= IEEE Extremely Inverse Curve

(MI)

= IEEE Moderate Inverse Curve

(SI)

= IEEE Short Inverse Curve

tBI

: Blocking Input reset time

Off

= Permanent block

2tBO

= Set 2xtBO.

: Minimum operation level

: Trip time delay

tBO

: Time to reset of the Blocking Output after expiring of the Trip time delay. “tBO” is

also the trip time delay of the Breaker Failure function.

17.11 - Function:

2Io>

(Second Earth Fault Element 50N/51N)

Status

→

Enab.

Yes

[No / Yes]

Options

→

tBI

Off

[Off / 2tBO]

Oper.Levels

→

0.01

(0.01

9.99)

step 0.01 On

Timers

→

100

(0.02

100)

step

0.01 s

→

tBO

0.75

(0.05

0.75)

step

0.01 s

On = Rated primary current of CTs or of the current Tore CT.

17.11.1 - Description of variables

Enab.

: Function enabling (No = Disable / Yes = Enable)

tBI

: Blocking Input reset time

Off

= Permanent block

2tBO

= Set 2xtBO.

: Minimum operation level

: Trip time delay

tBO

: Time to reset of the Blocking Output after expiring of the Trip time delay. “tBO” is

also the trip time delay of the Breaker Failure function.

Содержание MC2-30M

Страница 2: ..._________________________________________________14 8 1 Name _____________________________________________________________________________________14 8 2 User Descr _________________________________________________________________________________14 8 3 Linked functions _____________________________________________________________________________14 8 4 OpLogic________________________________________...

Страница 3: ..._______________________________________________44 18 20 1 Description of variables __________________________________________________________________44 17 20 2 Operation ____________________________________________________________________________44 17 21 Function IRF Internal Relay Fault ____________________________________________________________45 17 21 1 Description of variables _______________...

Страница 4: ...practicable protection means used in designing electronic circuits the electronic components and semiconductor devices mounted on the modules can be seriously damaged by electrostatic voltage discharge which can be experienced when handling the modules The damage caused by electrostatic discharge may not be immediately apparent but the design reliability and the long life of the product will have ...

Страница 5: ...al Inputs Additional RS485 communication port Input currents are supplied to 3 current transformers measuring phase currents An additional internal CT directly measures the residual Zero Sequence current of the three inputs Current inputs can be 1 or 5A selection between 1A or 5A is made by movable jumpers provided inside the Relay 2 1 Power Supply The relay can be fitted with two different types ...

Страница 6: ...le Navigation menu By these buttons the options showed in correspondence on the display are selected Increase These buttons are used to scroll the items of the different menus Local Control Measurements Energy metering etc Decrease 4 1 Display The 240x128 pixel hi resolution LCD display the available information menu etc ...

Страница 7: ... Actual Measurements MaxVal Maximum Values TripRec Trip Recording Counter Partial Counters Resettable Counter ROCnt Total Counter Read Only Counter Events Event Recording Setting Function Settings System System Settings InfoStatus Information Status TimeDate Time And Date Healthy Diagnostic Information Dev Info Relay Version ...

Страница 8: ...3 Select LedClear Press Select to execute the command 2 Select icon LocalCmd 4 When command has been executed the display shows Command Done Press Select 6 2 Display of the last trip Beside the signalization of the led Trip indicating a generic function trip the display shows a window indicating the latest function that was tripped and the number of events that are stored in the memory The display...

Страница 9: ...eds Configuration only via software The relay manage up to 10 signal leds Programmable 1 led Power green For Leds programming only via software operate as follows Open the software program and connect to the relay Select Change Windows from Menu button options Select Led Setting ...

Страница 10: ...ted Flashing When cause appear led is flashing 7 5 Funct Mode Volatile When cause disappear led turn off Not memorized Latched When cause disappear led remain illuminated memorized 7 6 Functions Select the function assigned to specific led see table 1 It s possible to configure only one function for each led For configuration multiple functions use UserVar function Light off Normal condition Light...

Страница 11: ...operation is required DskFull Disk Full Write should be lock DskWR Disk write in progress DskFRMT Disk Format in progress DskCHK Check disk in progress rDskAttach Not used Removable disk usb attach rDskDetach Removable disk usb detach rDskDtchable Removable disk usb now detachable rDskClean Removable disk usb near to full clean operation is required rDskFull Removable disk usb full write locked rD...

Страница 12: ...tched 1I Main Windows 7 8 1 Link Enable Select Link enable related to Led 1 and press right button on mouse select Value change Select Linked and press OK if Password is request see Password 7 8 2 Flashing Select Light prog related to Led 1 and press right button on mouse select Value change Select Flashing and press OK if Password is request see Password ...

Страница 13: ...unct Mode related to Led 1 and press right button on mouse select Value change Select Latched and press OK if Password is request see Password 7 8 4 Functions Select Functions related to Led 1 and press right button on mouse select Value change Select 1I and press OK if Password is request see Password ...

Страница 14: ...UP Fall Down 8 5 Timer Time delay 0 600 s step 0 01s 8 6 Timer type Delay Add a delay on output activation The Timer is edge triggered on rise edge Monostable P Activated the output for the time Timer Monostable N Disactivated the output for the time Timer Blinking The output switches periodically at the frequency defined by Timer Delay Fall Down Delay Fall Down 8 7 Extra Extra Time 0 65000 s step...

Страница 15: ...to UserVar 0 and press right button on mouse select Value change Insert Current Trip into box and press OK 8 9 2 Linked Functions Select Linked Functions related to UserVar 0 and press right button on mouse select Value change Select 1I 2I 3I from Available box via push button Add and press OK For remove functions use push button Remove ...

Страница 16: ...9 3 Operation Logic Oplogic Select Oper Logic related to UserVar 0 and press right button on mouse select Value change Insert OR into box and press OK 8 9 4 Timer Select Timer related to UserVar 0 and press right button on mouse select Value change Select 1 into box and press OK ...

Страница 17: ...ag 17 of 64 8 9 5 Timer type Select Timer related to UserVar 0 and press right button on mouse select Value change Select Monostable P into box and press OK 8 9 6 Extra Select Extra related to UserVar 0 and press right button on mouse Select 10 into box and press OK ...

Страница 18: ...ic records Yes Reset StNo Reset of the Starts Number Yes Reset Term Reset to zero of the accumulations relevant to Thermal Image and Interruption Energy only if T is enable Yes Leds Test Signal Leds test No Force Osc Force Oscillo Recording Yes Format iDisk Format internal disk Yes Check iDisk Check internal disk Yes To operate one command by the Front Face Keyboard proceed as follows Led Clear in...

Страница 19: ...ecrease to display the measurement Press Exit to go to the main menu Imx 0 99999 A Largest of the 3 phase currents Ia Ib Ic Ia 0 99999 A RMS value phase A current Ib 0 99999 A RMS value phase B current Ic 0 99999 A RMS value phase C current Io 0 99999 A RMS value of Zero Sequence Current I1 0 99999 In Positive sequence current I2 0 99999 In Negative Sequence current Tem 0 99999 T Thermal status as...

Страница 20: ...ress Select for access 3 Scroll the menu Measure with pushbutton Increase or Decrease to display the measurement Press Exit to go to the main menu Imx 0 99999 A Largest of the 3 phase currents Ia Ib Ic Ia 0 99999 A RMS value phase A current Ib 0 99999 A RMS value phase B current Ic 0 99999 A RMS value phase C current Io 0 99999 A RMS value of Zero Sequence Current I1 0 99999 In Positive sequence c...

Страница 21: ...ripRec icon with pushbutton Increase or Decrease Press Select for access 3 Select Display with pushbutton Increase or Decrease Press Select for access For Erase go to 8 4 If no trip is recorded the display shows No Trips 5 If any trip was recorded select View to display the chronological list of the records By the keys Increase or Decrease select the date of the record to be checked 6 Will be show...

Страница 22: ...rded are erased if Password is request see Password 9 When command has been executed the display shows Command Done Press Exit to go back to the main menu Imx 0 99999 A Largest of the 3 phase currents Ia Ib Ic Ia 0 99999 A RMS value phase A current Ib 0 99999 A RMS value phase B current Ic 0 99999 A RMS value phase C current Io 0 99999 A RMS value of Zero Sequence Current RMS Secondary Amps I2 0 9...

Страница 23: ...tions counters Start Sequence trip I 0 Operations counters No Load running trip TCS 0 Operations counters Trip Circuit Supervision IRF 0 Operations counters Internal Relay Fault BrkF 0 Operations counters Breaker failure AutOp 0 Operations counters Automatic C B Opening AutCL 0 Operations counters Automatic C B Closing ManOp 0 Operations counters Manual C B Opening ManCL 0 Operations counters Manu...

Страница 24: ...ons counters Second negative sequence current element motST 0 Operations counters Motor Start mStOV 0 Operations counters Motor Start Overall counter LR 0 Operations counters Locked Rotor trip StNo 0 Operations counters Start number limitation trip StSeq 0 Operations counters Start Sequence trip I 0 Operations counters No Load running trip TCS 0 Operations counters Trip Circuit Supervision IRF 0 O...

Страница 25: ...cess 3 Select Display with pushbutton Increase or Decrease Press Select for access For Erase go to 7 4 If no event is recorded the display shows message No Events 5 If any event was recorded select View to display the chronological list of the records By the keys Increase or Decrease select the date of the record to be checked 6 Will be shown Descr the function that caused the event Example 1I Sta...

Страница 26: ...ction Rise Fall MotON Trip Motor On Rise Fall Time Sincro Trip Time Sincronization Rise Disk DskClean Disk near to full clean operation is required Rise DskFull Disk full write should be lock Rise DskFRMT Disk format in progress Rise Fall rDskAttach Not Used removable disk usb attach Rise rDskDetach Not Used removable disk usb detach Rise rDskDtchable Not Used removable disk usb now detachable Ris...

Страница 27: ...ct System icon with pushbuttons Increase or Decrease Press Select for access 3 Select CTs PTs Press Select for access 4 Select Phase CT Press Select for access 5 Select Primary to modify the value or press Decrease Press Modify to modify the parameter if Password is request see Password 6 Appear icon Use pushbuttons Increase or Decrease to set the value Press Write to confirm the value 7 The value...

Страница 28: ...T T Thermal Image 1I 1I First Overcurrent Element 2I 2I Second Overcurrent Element 3I 3I Third Overcurrent Element 1Io 1Io First Earth Fault Element 2Io 2Io Second Earth Fault Element 3Io 3Io Third Earth Fault Element 1Is 1Is First Negative Sequence Current Element 2Is 2Is Second Negative Sequence Current Element MotSt MotSt Motor Start LR LR Locked rotor protection StNo StNo StartNumber limitatio...

Страница 29: ...ns Increase or Decrease 8 Set new values pushbuttons Increase or Decrease buttons Press Select Press Write 3 Select by pushbuttons Group 1 9 If the change of parameters is completed press Exit Press Select 4 Select by pushbuttons Increase or Decrease the parameter 1I 1 0 Yes confirm all changes Press Select No voids all the changes 5 Select by buttons Increase or Decrease the menu Oper Levels 1 1 ...

Страница 30: ...rease or Decrease to set the third digit 2 Press Next to validate and go to the next digit 6 Press Next to validate and go to the next digit 3 Use the key Increase or Decrease to set second digit 7 Use the key Increase or Decrease to set the fourth digit 4 Press Next to validate and go to the next digit 8 Press Next to validate and go to modify the next parameter By key Prev go back to previous di...

Страница 31: ... port and by the interface program for Windows XP Pro SP3 7 10 it is possible connect a Personal Computer to download all available information operate any control and program the relay the protocol used is Modbus RTU 17 3 3 Cable for connection from Relay to Personal Computer The connection cable is a standard USB A mini USB B 17 3 4 Main serial communication port RS485 From the Relay s back term...

Страница 32: ...e Display backlight can be programmed always on ON or switched on Automatically for a few second set parameter tBckL at any operation of the keyboard Example set Local Language 1 Press Menu for access to the main menu with icons 5 Select Loc Lang Press Write If Password is requested see Password 2 Select icon Setting by pushbuttons Increase or Decrease 6 Press Exit Press Select 3 Select Group 1 or...

Страница 33: ...n your desktop to access disk management select the relay hard drive on recording equipment 17 5 2 1 Journal file Example Directory Descriptions DATALOG 2018 Year Jul Month 08 Day Jrnl_08 07 2018 txt Journal File Jrnl_08 07 2018 txt Date Time Event 2018 07 03 18 42 07 100 Vcc Rise 2018 07 03 18 42 07 100 L Rdisc Rise 2018 07 03 18 42 07 110 IPU boot Rise 17 5 2 2 Faults log file Example Directory ...

Страница 34: ... admissible current Is When the ratio T Ts reaches the level set for Thermal Alarm Tal of the max allowed heating the relay trips accordingly 17 6 2 1 Trip time of the Thermal Image Element The trip time of the Thermal Image Element is a function of the current I flowing into the load and depends on its warming up Time Constant Kt on the previous thermal status Ip and on the maximum admissible con...

Страница 36: ...ble Yes Enable f t Operation characteristic Time Current curve D Independent definite time A IEC Inverse Curve type A B IEC Very Inverse Curve type B C IEC Extremely Inverse Curve type C I IEEE Inverse Curve VI IEEE Very Inverse Curve EI IEEE Extremely Inverse Curve MI IEEE Moderate Inverse Curve SI IEEE Short Inverse Curve tBI Blocking input reset time Off Permanent block 2tBO Set 2xtBO Is Minimu...

Страница 37: ...ng Logic it is possible to inhibit the time delayed tripping by an external signal that activates a Digital Input programmed for this functionality The programmed Digital Input gets activated by an external cold contact closing across its terminals With the variable tBI set to OFF tBI OFF the tripping of the delayed function is blocked as long as the Blocking Input signal is present at the termina...

Страница 38: ... Trip time delay tBO is also the trip time delay of the Breaker Failure function t2xI Maximum time of automatic threshold doubling on inrush 17 9 Function 3I Third Overcurrent Element F50 51 Status Enab Yes No Yes Options tBI Off Off 2tBO 2xI Disable Disable Enable Oper Levels Is 1 In 0 1 40 step 0 01 In Timers ts 5 s 0 02 100 step 0 01 s tBO 0 75 s 0 05 0 75 step 0 01 s t2xI 2 s 0 02 100 step 0 0...

Страница 39: ...EEE Moderate Inverse Curve SI IEEE Short Inverse Curve tBI Blocking Input reset time Off Permanent block 2tBO Set 2xtBO Is Minimum operation level ts Trip time delay tBO Time to reset of the Blocking Output after expiring of the Trip time delay tBO is also the trip time delay of the Breaker Failure function 17 11 Function 2Io Second Earth Fault Element 50N 51N Status Enab Yes No Yes Options tBI Of...

Страница 40: ... 02 100 step 0 01 s tBO 0 75 s 0 05 0 75 step 0 01 s On Rated primary current of CTs or of the current Tore CT 17 12 1 Description of variables Enab Function enabling No Disable Yes Enable tBI Blocking Input reset time Off Permanent block 2tBO Set 2xtBO Is Minimum operation level ts Trip time delay tBO Time to reset of the Blocking Output after expiring of the Trip time delay tBO is also the trip ...

Страница 41: ...e delay tBO Time to reset of the Blocking Output after expiring of the Trip time delay tBO is also the trip time delay of the Breaker Failure function 17 13 2 Time Current operation of the first Current Unbalance element f t The relay measures the Negative Sequence component I2 of the input current The Time Current curves can be selected by programming the variable f t f t D Independent definite t...

Страница 42: ...m Status Enab Yes No Yes Oper Levels ILR 1 In 1 5 step 0 01 In Timers tLR 120 s 1 120 step 0 01 s 17 16 1 Description of variables Enab Function enabling No Disable Yes Enable ILR Minimum operation level tLR Trip time delay 17 17 Function StNo Limitation Start Number Status Enab Yes No Yes Oper Levels StNo 10 In 1 60 step 1 Timers tstNo 600 s 60 3600 step 60 s tBst 600 s 60 3600 step 60 s 17 17 1 ...

Страница 43: ...r delta resistance or impedance autotransformer etc thus allowing to automatically manage the starting transition by controlling the parameters ITr tTr At motor start counting of tTr begins If during tTr the motor current drops below lTr switching over is operated if motor current stays above lTr longer than tTr the Locked Rotor element is activated 17 19 Function I No load running Status Enab No ...

Страница 44: ...ontact of R1 is used to trip the C B as reported in the drawing here below The supervision works when the C B is closed and recognizes the Trip Circuit as sound as far as the current flowing exceeds 1mA In case of Trip Circuit Fault detection the diagnostic relay is operated and the Led starts flashing see Signalization To have Supervision also with the C B open one N C contact 52b from the C B an...

Страница 45: ...ng of the function operates a user programmable output relay 17 22 Function BrkFail Breaker Failure Status Enab No No Yes Timers tBF 0 75 s 0 05 0 75 step 0 01 s 17 22 1 Description of variables Enab Function enabling No Disable Yes Enable tBF Trip time delay 17 22 2 Operation The Breaker Failure detection is started by the operation of the output relay R1 programmed to be controlled by the Protec...

Страница 46: ...f User Logic see User Trigger Oscillo FEUserLg On falling edge of User Logic tPre Recording time before Trigger tPost Recording time after Trigger 17 23 2 Operation In the options Trig Start and Trig Trip the oscillographic recording starts respectively when any protection function starts operating or trip The Oscillo Function includes the oscillographic recorder of input quantities able to store ...

Страница 47: ...N t1Io Trip 2Io 2Io Start Second earth fault element F50N 51N t2Io Trip 3Io 3Io Start Third earth fault element F50N 51N t3Io Trip 1Is 1Is Start First negative sequence current element F46 t1Is Trip 2Is 2Is Start Second negative sequence current element F46 t2Is Trip Mot On Motor Start LR ILR Start Start Locked rotor tILR Trip Trip Locked rotor LimStNum Trip Limitation of start number StSeqSucc St...

Страница 48: ...ions 17 23 4 4 OpLogic Operation Logic None OR AND XOR NOR NAND NOT Ff SR Counter Rise UP Fall Down 17 23 4 5 Timer Time delay 0 600 s step 0 01s 17 23 4 6 Timer type Delay Add a delay on output activation The Timer is edge triggered on rise edge Monostable P Activated the output for the time Timer Monostable N Disactivated the output for the time Timer Blinking The output switches periodically at...

Страница 49: ... Select Change Windows from Menu button Select User Variable Setting for User Trigger Oscillo 1I 2I 3I AND 1 Monostable 10 17 25 5 1 Linked Functions Select Linked Functions related to User Trigger Oscillo and press right button on mouse select Value change Select 1I 2I 3I from Available box via push button Add and press OK For remove functions use push button Remove ...

Страница 50: ...on Logic Oplogic Select Oper Logic related to User Trigger Oscillo and press right button on mouse select Value change Insert AND into box and press OK 17 20 5 3 Timer Select Timer related to User Trigger Oscillo and press right button on mouse select Value change Select 1 into box and press OK ...

Страница 51: ...20 5 4 Timer type Select Timer related to User Trigger Oscillo and press right button on mouse select Value change Select Monostable P into box and press OK 17 20 5 5 Extra Select Extra related to User Trigger Oscillo and press right button on mouse Select 10 into box and press OK ...

Страница 52: ...ble The pushbuttons on Front Panel are disabled Enable The pushbuttons on Front Panel are Enable Key0 Configure a Key as C B Open KeyC Configure a Key as C B Close tL R Admissible time before detection of the Local Remote discrepancy alarm tC Bs Maximum admissible delay for detection of status signal after C B operation 17 24 2 Push Buttons Programmable only via software It is possible to program ...

Страница 53: ...ar 0 UserVar 0 manOpCmd Gen Trip Manual Open Command Generic Trip UserVar 1 UserVar 1 CL Cmd Close Command 17 24 2 3 DO Configuration Select DO Configuration Assign to Type Linked Functions 0 R1 UserVar 0 0 R2 UserVar 1 17 24 2 4 Function Setting Select Function Setting Assign to CB Manage Type Settings Enable Local remote Active Enable Local Keys Enable KeyO P1 KeyC P2 ...

Страница 54: ...ital Input 0 D1 Programmable D1 Any digital input is active when the relevant terminals see wiring diagram are shorted 0 D2 Programmable D2 0 D3 Programmable D3 0 D4 Programmable D4 0 D5 Programmable D5 0 D6 Programmable D6 0 D7 Programmable D7 0 D8 Programmable D8 18 2 DI Configuration via software Any of the Digital Inputs can be programmed to control one or more of the following functions Bi1I ...

Страница 55: ...ction function 18 2 1 4 Example Setting Digital Input Open software program and connect to the relay Select Change Windows from Menu Select DI configuration Setting for Bi1I 1I 18 2 1 5 Functions Select Functions related to Bi1I and press right button on mouse select Value change From box Available select 1I and press Add Press OK for confirmation if Password is request see Password ...

Страница 56: ...1 1 Relay Relay internal name 18 4 1 2 Linked function It s available only 1 link select the function for tripping the output relay for multiple association use User Variable 18 4 1 3 Operation Logic Not Used 18 4 1 4 Logical Status Relay Logical status 18 4 1 5 Output Configuration Normally Denergized The output relay is denergized in normal conditions and gets energized on activation of the cont...

Страница 57: ... the output relay is operated when the controlling Functional Output is activated and remains in the operated condition until a manual reset command is issued by the relay keyboard local commands menu or via the serial communication In this mode the timer tON has no effect Impulsive In this mode the output relay is operated when the controlling Functional Output is activated and it remains in the ...

Страница 58: ...ctions Select Linked Functions related to 0 R1 and press right button on mouse select Value change From box Available select 1I and press Add Press OK for confirmation if Password is request see Password 18 4 2 3 Output Config Select Output Config related to 0 R1 and press right button on mouse select Value change Select Normally Deenergized from combo box and press OK if Password is request see P...

Страница 59: ...Select Manual reset from combo box and press OK if Password is request see Password 18 4 2 5 tON Select tON related to 0 R1 and press right button on mouse select Value change Set 0 5 and press OK if Password is request see Password 19 InfoStatus In this menu is showed the status of relay Options LocR Disable LocR Local and Remote Status Disable Local Remote Discrepancy Status ...

Страница 60: ...fW Day Es Wednesday 1 Press Menu for access to the main menu with icons 2 Select icon TimeDate by pushbuttons Increase or Decrease Press Select 3 Press Modify 4 The last two figures of the Year will appear in bold character by pushbuttons Increase or Decrease set the new figures Press Next to go to the next setting 5 As above for changing the Month Press Next to go to the next setting 6 As above f...

Страница 61: ...ly Press Exit to go back to the main menu Press Modify to go back to the step 3 Press the button Next to go back to the previous display 20 1 Clock synchronization The internal clock has 1ms resolution and a stability of 35ppm in the operational temperature range It can be synchronized with an external time reference in the following ways Using the standard Time Synchronization procedure of the IE...

Страница 62: ...e Corrupt Code Corrupt Data Corrupt Data Corrupt SPI Serial peripheral interface IIC I2C bus failure If an internal self clearing transient fault is detected it is recorded into an historical file without any other action 22 Dev Info Relay Version In this menu it is possible to read the information relevant to relay unit SW Version IPU R Firmware version Protect Model xxxxxx Protection Type Serial...

Страница 64: ...waves Ring waves IEC61000 4 12 level 4 4kV c m 2kV d m Surge immunity test IEC61000 4 5 level 4 2kV c m 1kV d m Voltage interruptions IEC60255 4 11 Resistance to vibration and shocks IEC60255 21 1 IEC60255 21 2 10 500Hz 1g Caracteristics Accuracy at reference value of influencing factors 1 In for measure 2 to to 20 30ms 2xIs for times Rated Current In 1 or 5A On 1 or 5A Current Overload 100 In for...

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