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YASKAWA VS MINI J7 series, Instruction Manual, Page: 9 / 118

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YASKAWA VS MINI J7 series Instruction Manual Download Page 9

9

MAINTENANCE AND INSPECTION

CAUTION

(Ref. page)

• Never touch the heatsink or braking resistor, the 

temperature is very high.

Failure to observe this caution can result in harmful burns 
to the body.

• Since it is easy to change operation speed from low to 

high speed, verify the safe working range of the motor 
and machine before operation.

Failure to observe this caution can result in personal injury 
and machine damage.

• Install a holding brake separately if necessary.

Failure to observe this caution can result in personal injury.

• Do not change signals during operation.

The machine or the inverter may be damaged.

• All the parameters of the inverter have been preset at 

the factory. Do not change the settings unnecessarily.

The inverter may be damaged. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  25

WARNING

(Ref. page)

• Never touch high-voltage terminals in the inverter.

Failure to observe this warning can result in an electrical shock.  . . . . . . . . . .  99

• Disconnect all power before performing maintenance or 

inspection. Then wait at least one minute after the power 
supply is disconnected and all LEDs and CHARGE LED 
are extinguished.

The capacitors discharge slowly, and may be dangerous. . . . . . . . . . . . . . . . .  99

All manuals and user guides at all-guides.com

Summary of Contents for VS MINI J7 series

Page 1: ...VS mini J7 Series Instruction Manual COMPACT GENERAL PURPOSE INVERTER VOLTAGE VECTOR CONTROL All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 2: ...with the protective covers and shields removed in order to illustrate detail with more clarity Make sure all covers and shields are replaced before operating this product This manual may be modified w...

Page 3: ...4 MOUNTING 35 Choosing a Location to Mount the Inverter 35 Mounting Dimensions 36 Mounting Removing Components 37 5 WIRING 39 Wiring Instructions 39 Wire and Terminal Screw Sizes 39 Wiring the Main Ci...

Page 4: ...Interface Circuits with External Devices 84 Setting Frequency by Current Reference Input 89 Decreasing Motor Speed Fluctuation 93 Motor Protection 94 Selecting Cooling Fan Operation 96 Using MEMOBUS...

Page 5: ...ay result in minor or moderate injury to personnel and possible damage to equipment if not avoided It may also be used to alert against unsafe practices Items described in may also result in a vital a...

Page 6: ...amage to the unit 35 The VS mini J7 generates heat For effective cooling mount it vertically Refer to the figure in Mounting Dimensions on page 16 WARNING Ref page Start wiring only after verifying th...

Page 7: ...erter It may cause semi conductor elements to be damaged Make sure to tighten terminal screws of the main circuit and the control circuit Failure to observe this caution can result in a malfunction da...

Page 8: ...s to assure safety for personnel even if the inverter should restart Failure to observe this warning can result in personal injury 75 When continuous operation after power recovery is selected stand c...

Page 9: ...is caution can result in personal injury Do not change signals during operation The machine or the inverter may be damaged All the parameters of the inverter have been preset at the factory Do not cha...

Page 10: ...ck Failure to observe this warning can result in an electrical shock 99 CAUTION Ref page The control PC board employs CMOS ICs Do not touch the CMOS elements They are easily damaged by static electric...

Page 11: ...nverter PLASTIC ENCLOSURE NAME PLATE STATUS INDICATOR LAMP WARNING Warning Label Read manual before installing Wait 1 minute for capacitor discharge after disconnecting power supply To conform to CE r...

Page 12: ...ip Check the unit for physical damage that may have occurred during shipping If any part of VS mini J7 is missing or damaged call for service immediately Checking the Nameplate U S and Canadian Safety...

Page 13: ...13 2 IDENTIFYING THE PARTS All manuals and user guides at all guides com...

Page 14: ...14 Notes All manuals and user guides at all guides com...

Page 15: ...V f control Frequency Control Range 0 1 to 400Hz Frequency Accuracy Temperature Change Digital reference 0 01 10 to 50 C Analog reference 0 5 25 10 C Frequency Setting Resolution Digital reference 0...

Page 16: ...ntil the DC bus voltage becomes 50V or less Input Signals Multi function Input Four of the following input signals are selectable Reverse run 3 wire sequence fault reset external fault NO NC contact i...

Page 17: ...itions Ambient Temperature Open chassis 10 to 50 C 14 to 122 F not frozen Humidity 95 RH or less non condensing Storage Temperature 4 to 140 F 20 to 60 C Location Indoor free from corrosive gases or d...

Page 18: ...reference 0 01 14 to 122 F 10 to 50 C Analog reference 0 5 59 to 95 F 25 10 C Frequency Setting Resolution Digital reference 0 1Hz less than 100Hz 1Hz 100Hz or more Analog reference 1 1000 of max outp...

Page 19: ...r less Input Signals Multi function Input Four of the following input signals are selectable Reverse run 3 wire sequence fault reset external fault NO NC contact input multi step speed operation Jog c...

Page 20: ...e self cooling Environmental Conditions Ambient Temperature Open chassis 10 to 50 C 14 to 122 F not frozen Humidity 95 RH or less non condensing Storage Temperature 20 to 60 F 4 to 140 C Location Indo...

Page 21: ...21 Standard Wiring All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 22: ...8mA S2 Multi function input selection 2 Factory setting closed REV run S3 Multi function input selection 3 Factory setting Fault reset S4 Multi function input selection 4 Factory setting External fau...

Page 23: ...23 Dimensions All manuals and user guides at all guides com...

Page 24: ...8 68 5 04 128 2 76 70 2 20 56 4 65 118 0 20 5 M 4 1 32 0 6 1 0 25 0 2 2 68 68 5 04 128 2 76 70 2 20 56 4 65 118 0 20 5 M 4 1 54 0 7 1 0 5 0 4 2 68 68 5 04 128 4 41 112 2 20 56 4 65 118 0 20 5 M 4 2 20...

Page 25: ...requency reference 1 n21 2 Control circuit terminal voltage 0 10V 3 Control circuit terminal current 4 20 mA 4 Control circuit terminal current 0 20 mA 5 Not used setting error 6 Communication registe...

Page 26: ...8 16 0110H Acceleration time 1 Setting unit 0 1s less than 100s 1s 100s or greater Setting range 0 0 999s 10 0s 69 17 0111H Deceleration time 1 Setting unit 0 1s less than 100s 1s 100s or greater Sett...

Page 27: ...range 0 0 400Hz 0 0Hz 65 29 011DH Jog frequency reference Setting unit 0 1Hz less than 100Hz 1Hz 100Hz or greater Setting range 0 0 400Hz 6 00Hz 66 30 011EH Frequency reference upper limit Setting uni...

Page 28: ...ontact input 14 Speed search command from Max output frequency 15 Speed search command set fre quency 16 Accel decel hold 17 Local remote switching 18 Communication control circuit ter minal switching...

Page 29: ...13 Inverter ready 14 During fault retry 15 During UV 16 During reverse run 17 During speed search 18 Data output through communication 1 87 41 0129H Analog frequency reference gain Setting unit 1 Set...

Page 30: ...Hz 100Hz or greater Setting range 0 00 400Hz Note If 0 0Hz is set jump frequency 2 is disabled 0 0Hz 75 51 0133H Jump frequency width Setting unit 0 1Hz Setting range 0 0 25 5Hz Note If 0 0Hz is set j...

Page 31: ...red 1 Hold output frequency is stored 0 86 63 013FH Torque compensation gain Setting unit 0 1 Setting range 0 0 2 5 1 0 60 64 0140H Motor rated slip Setting unit 0 1Hz Setting range 0 0 20 0Hz Note 2...

Page 32: ...dd parity 2 No parity 0 73 0149H Send waiting time Setting unit 1 1ms Setting range 10 65 ms 10ms 74 014AH RTS control 0 RTS control enabled 1 RTS control disabled 0 75 76 0 Execution completed execut...

Page 33: ...45 35 32 No Name Unit Factory setting Inverter capacity kW 0 1kW 0 2kW 0 4kW 0 75kW 1 5kW 2 2kW 3 7kW n32 Motor rated current A 0 6 1 1 1 9 3 3 6 2 8 5 14 1 n64 Motor rated slip Hz 2 5 2 6 2 9 2 5 2...

Page 34: ...34 Notes All manuals and user guides at all guides com...

Page 35: ...assis type 14 to 122 F 10 to 50 C Rain moisture Oil sprays splashes Salt spray Direct sunlight Avoid using outdoors Corrosive gases e g sulfurized gas or liquids Dust or metallic particles in the air...

Page 36: ...36 Mounting Dimensions Clearances as shown below are required when mounting the VS mini All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 37: ...verter Press the lower part of front cover onto the plastic case until the cover snaps shut Tighten the screws Removing option cover After removing front cover remove the option cover to direction 2 w...

Page 38: ...38 Notes All manuals and user guides at all guides com...

Page 39: ...wiring Use twisted pair shielded wire when inputting the frequency signal externally 5 Tighten the screws on the main circuit and control circuit terminals 6 Do not connect or disconnect wiring or pe...

Page 40: ...0 75 to 2 18 to 14 2 14 CIMR J7 U21P5 R L1 S L2 1 2 U T1 V T2 W T3 M3 5 7 1 to 8 88 0 8 to 1 0 2 to 5 5 14 to 10 2 14 CIMR J7 U22P2 R L1 S L2 1 2 U T1 V T2 W T3 M3 5 7 1 to 8 88 0 8 to 1 0 2 to 5 5 14...

Page 41: ...0 8 to 1 0 2 to 5 5 14 to 10 2 14 CIMR J7 U40P7 R L1 S L2 T L3 1 2 U T1 V T2 W T3 M3 5 7 1 to 8 88 0 8 to 1 0 2 to 5 5 14 to 10 2 14 CIMR J7 U41P5 R L1 S L2 T L3 1 2 U T1 V T2 W T3 M3 5 7 1 to 8 88 0...

Page 42: ...cordingtothelocalgroundingcode NevergroundtheVSminiJ7towelding machines motors orotherelectrical equipment On Single phase models terminal T L3 is connected internally within the inverter Never use th...

Page 43: ...P5 J7 22P2 J7 23P7 Capacity kVA 0 3 0 6 1 1 1 9 3 0 4 2 6 7 Rated Output Current A 0 8 1 6 3 5 8 11 17 5 MCCB type NF30 MITSUBISHI 5A 5A 5A 10A 20A 20A 30A Magnetic contactor type HI YASKAWA CONTROL H...

Page 44: ...ilter exclusively for inverter if radio noise generated from the inverter causes other control devices to malfunction NOTE 1 Never connect a general LC RC noise filter to the inverter output circuit 2...

Page 45: ...all the covers in the original position SW7 can be changed according to sequence input signal S1 to S5 polarity 0V common NPN side factory setting 24 common PNP side Refer to pages 89 for SW8 Wiring t...

Page 46: ...eft inside the unit Screws are securely tightened Bare wires in the terminal do not come in contact with other terminals If the FWD REV run command is given during the operation reference selec tion n...

Page 47: ...7 using the digital operator with volume For instructions on operation refer to page 47 Operation reference or frequency reference parameters can be selected separately as shown below Name Parameter O...

Page 48: ...L 5 times to illuminate Lo RE Select Lo local mode using or key Lo RUN ALARM 3 F R blinks Select FWD REV run using keys Never select REV when reverse run is prohibited For or REV RUN ALARM 4 Press DSP...

Page 49: ...ing the Digital Operator All functions of the VS mini J7 are set by the digital operator Below are descriptions of the display and keypad sections Digital Operator All manuals and user guides at all g...

Page 50: ...ls on how the status indicator LED s function at inverter faults refer to Section 8 FAULT DIAGNOSIS AND CORRECTIVE ACTIONS on page 103 If a fault occurs the ALARM LED lights The fault can be reset by...

Page 51: ...ion By pressing on the digital operator each of the function LED s can be selected The following flowchart describes each function LED 51 and 52 All manuals and user guides at all guides com a l l g u...

Page 52: ...on monitor Selecting monitor Press key When is ON data can be displayed by selecting monitor No Example Monitoring Output Voltage Reference Parameter Parameter No Refer to page 57 All manuals and user...

Page 53: ...be monitored U 05 DC voltage V Main circuit DC bus voltage can be monitored U 06 Input terminal status Input terminal status of control circuit terminals can be monitored U 07 Output terminal status...

Page 54: ...3 for details Clearing fault history Set parameter n001 to 6 to clear fault history Set data returns to its initial value after completion of 6 setting Note Parameter initialize n01 10 11 also clears...

Page 55: ...for simple accel decel operation of the VS mini Frequency reference by analog voltage is set with initial setting n03 2 Following is an example in which the function LEDs are used to set frequency re...

Page 56: ...56 Notes All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 57: ...requency n14 For details refer to Adjusting torque according to application V f pattern set ting on page 56 3 If the following conditions are not satisfied in the Jump frequency setting Jump frequency...

Page 58: ...f n14 n12 the set value of n13 is disabled Adjusting torque according to application Parameters No Name Unit Setting range Initial Setting n09 Max output frequency 0 1Hz 50 0 to 400Hz 60 0Hz n10 Max v...

Page 59: ...led When running at a frequency exceeding 50Hz 60Hz change the maximum output frequency n09 Note Be sure to set the maximum output frequency according to the motor characteristics Increasing voltage o...

Page 60: ...on as well as during acceleration The required torque is calculated by the inverter This ensures tripless operation and energy saving effects Operation Normally no adjustment is necessary for torque c...

Page 61: ...the digital operator for RUN STOP commands and FWD REV run commands Frequency reference can be set by volume or REMOTE Mode Run by the n02 setting operation reference selection Frequency reference can...

Page 62: ...o select remote mode 1 Select rE remote mode for selection 2 When the local remote switching function is selected as multi function input selection turn OFF the input terminal to select remote mode Se...

Page 63: ...g the desired frequency value Frequency reference setting is immediately effective when n08 1 The ENTER key does not have to be pressed to enter the reference n08 0 Enables frequency reference accepta...

Page 64: ...ing terminal FR as a current reference input Example of frequency reference by voltage signal n03 2 factory setting SW8 is set to V position when using terminal FR as a voltage reference default setti...

Page 65: ...ection n03 1 Frequency reference selection n21 25 0Hz Frequency reference 1 n22 30 0Hz Frequency reference 2 n23 35 0Hz Frequency reference 3 n24 40 0Hz Frequency reference 4 n25 45 0Hz Frequency refe...

Page 66: ...p speed references 1 2 3 or 4 are input simultaneously with the jog command the jog command has priority Operating at Jog frequency reference Name parameter No Setting Jog frequency reference n29 Fact...

Page 67: ...quency n09 can be set in units of 1 maximum output frequency n09 100 Factory setting 100 b Frequency reference bias n42 The frequency reference provided when the analog input is 0V 4mA or 0mA can be s...

Page 68: ...68 To operate the inverter with frequency reference of 50 to 100 at 0 to 10V input Gain n41 100 Bias n42 50 All manuals and user guides at all guides com...

Page 69: ...upper n30 and lower n31 limits determines the range over which the inverter will operate Frequency reference upper limit n30 Sets the upper limit of the frequency reference in units of 1 n09 Maximum...

Page 70: ...s occurs operation restarts automatically Maintain the run command to continue operation after recovery from a momentary power loss When 2 is selected operation restarts if power supply voltage reache...

Page 71: ...stics time from accel decel rate 0 to a regular accel decel rate determined by the set accel decel time Soft start characteristics n020 Setting S curve characteristic time 0 S curve characteristic not...

Page 72: ...o output alarm signals to multi function output terminals MA and MB To output an overtorque detection signal set output terminal function selection n40 to overtorque detection Setting 6 NO contact or...

Page 73: ...n units of 1 Inverter rated current 100 Factory setting 160 Overtorque detection time n61 If the time when the motor current exceeds the overtorque detection level n61 the overtorque detection functio...

Page 74: ...detection turns ON when output frequency is higher or lower than the frequency detection level n58 Frequency detection 1 Output frequency Frequency detection level n58 Set n40 to 4 Frequency detection...

Page 75: ...lt detection after a fault occurs The number of self diagnosis and retry attempts can be set with n48 0 thru 10 restarts The inverter will automatically restart after the following faults occur OC ove...

Page 76: ...command is input before the search command the search command becomes disabled Time chart at search command input DC injection braking at start n52 n54 When starting into a coasting motor use DC inje...

Page 77: ...n accel decel hold is internally released and operation ramps to stop Set multi function input terminal selection n36 to n39 to 16 accel decel hold command Note When the FWD REV run command is input a...

Page 78: ...d to adjust analog output gain Scales the analog output voltage signal level at 100 of output frequency output current Example Frequency meter displays 0 to 60Hz with 0 to 3V 10V x n45 setting 0 30V 3...

Page 79: ...cy that changes with output frequency as follows Reducing motor noise leakage current n46 Setting Carrier Frequency kHz Audible Noise from Motor RFI Noise and Current Leakage 7 12 fout Hz 8 24 fout Hz...

Page 80: ...Hz 3 4 3 0 2 1 5 3 7 5kHz 4 8 4 0 3 2 2 3 7 5kHz 5 5 4 8 4 3 0 3 7 5kHz 7 2 6 3 5 3 7 3 7 5kHz 9 2 7 6 1 Reduce continuous output current by changing carrier frequency to a setting of 4 10 kHz for 200...

Page 81: ...als or communications When STOP key is pressed the inverter stops according to the setting of parameter n04 At this time the digital operator displays alarm blinking This stop command is held in the i...

Page 82: ...tion braking is also applied when the motor decelerates by setting the frequency reference lower than minimum output frequency while the n14 with FWD REV run command remains ON If the decel time is sh...

Page 83: ...e DC injection braking time at stopping in units of 0 1 second When the setting of n53 is 0 DC injection braking is not performed but inverter output is shut OFF at the timing of DC injection braking...

Page 84: ...NO contact input Motor coast to a stop by this signal input Digital operator display is 13 External baseblock NC contact input 14 Search command from maximum frequency Speed search reference signal 7...

Page 85: ...input terminals S1 to S7 Closed Run by volume frequency reference and run command from the digital operator UP DOWN command setting 34 With the FWD REV run command entered accel decel is initiated by...

Page 86: ...the jog command has priority 5 Multi step speed reference 1 to 3 is not effective when UP DOWN command is selected Multi step speed reference is effective during running in hold status 6 When 1 is set...

Page 87: ...osed when setting frequency agrees with inverter output frequency 88 3 Zero speed Closed when inverter output frequency is less than minimum output frequency 4 Frequency detection Output frequency fre...

Page 88: ...88 Initial setting of multi function output terminal No Terminals Initial Setting n40 MA MB 1 Inverter Run 2HZ OUTPUT FREQUENCY All manuals and user guides at all guides com...

Page 89: ...8 is switched to I side Damage to the inverter may result When setting frequency by inputting current reference 4 20mA or 0 20mA from the control circuit terminal FR switch the DIP switch SW8 on the c...

Page 90: ...al operator keys to run or stop the inverter Switch run and stop direction by setting F R LED Set frequency by the analog current signal 0 100 max frequency 4 20mA or 0 20mA connected to the control c...

Page 91: ...ion if the output current exceeds the value set for n56 acceleration stops and frequency is maintained When the output current goes down to the value set for n56 acceleration continues In the constant...

Page 92: ...n57 acceleration begins to the set frequency The accel decel rates during stall prevention are determined by the accel time n16 or n18 and decel time n17 or n19 that is selected at the time of the sta...

Page 93: ...sation is not performed during regeneration 3 Slip compensation is not performed when motor rated current n32 is set to 0 0A Slip compensation Parameters No Name Unit Setting Range Initial Setting n03...

Page 94: ...motor an error occurs shutting OFF the inverter output and preventing excessive overheating in the motor When operating with one inverter connected to one motor an external thermal relay is not needed...

Page 95: ...50 60Hz from commercial power supply Base Frequency 60Hz V f for 60Hz 220V Input Voltage For low speed operation torque must be limited in order to stop motor temperature rise error motor overload pr...

Page 96: ...S mini units Transmission between master and slave serial communication is controlled according to the master program with the master initiating communication and the slave responding The master sends...

Page 97: ...cation parameters Baud rate Selected from 2400 4800 9600 19200 bps Data length 8 bits fixed Parity Selected from even odd none Stop bits 1 bit fixed Communication protocol MEMOBUS MODBUS RTU mode only...

Page 98: ...98 Notes All manuals and user guides at all guides com...

Page 99: ...9 2 X 104 to 58 8 X 104 Pa 57 to 85 psi 4 to 6kg cm2 pressure Printed circuit board Accumulation of conductive material or oil mist Blow with dry compressed air 39 2 X 104 to 58 8 X 104 Pa 57 to 85 ps...

Page 100: ...connector 3 Open the left and right sides of the fan cover to remove the cooling fan from the cover 2 Mounting 1 Mount the cooling fan to the fan cover The arrow indicating the air flow direction of t...

Page 101: ...d left sides of the fan cover to remove the cover from the cool ing fan 2 Mounting 1 Mount the cooling fan to the fan cover The arrow mark indicating the air flow direction must point away from the co...

Page 102: ...102 NOTES All manuals and user guides at all guides com...

Page 103: ...ons and corrective actions to be taken if the VS mini J7 malfunctions Corrective Actions for models without digital operator 1 Input fault reset or cycle the power supply OFF and ON 2 When a fault can...

Page 104: ...ircuit power supply wiring is connected Terminal screws are securely tightened Blinking OV Main circuit over voltage Main circuit DC voltage exceeds the over voltage detection level while the inverter...

Page 105: ...5 Setting values of jump frequencies 1 and 2 are not appropriate parameters n49 to n50 OP9 Carrier frequency setting is incorrect parameter n46 Check the setting values Blinking OL 3 Over torque detec...

Page 106: ...running by the control circuit terminals FWD REV command or by the run command from communications The inverter stops according to parameter n04 STP Emergency stop Inverter receives emergency stop al...

Page 107: ...xceeds the overfatigue detection level because of excessive regenerative energy from the motor Detection level 200V Stops at main circuit DC voltage below approx 410V 400V Stops at main circuit DC vol...

Page 108: ...parameters n09 to n15 Set the motor rated current shown on the nameplate by parameter n36 OL2 Inverter overload Inverter overload protection operates by built in electronic thermal overload relay Chec...

Page 109: ...om control circuit terminal S5 Check the external circuit sequence CPF 00 Initial memory fault is detected Cycle power If the fault remains replace the digital operator or inverter CPF 01 ROM error is...

Page 110: ...inverter CE MEMOBUS communications fault Normal reception of communication data is not possible Check the communication devices or communication signals Stops according to parameter STP Emergency stop...

Page 111: ...le unless they are isolated from accessible circuits by supplemental insulation These circuits can be connected only to the following circuits 30VDC or less overvoltage category 2 250 VAC or less over...

Page 112: ...eened cable max 20m must be used and the screen of the motor cable is connected to ground at both ends by a short connection using as large an area as practical For a more detailed explanation please...

Page 113: ...del Current A Weight kg Dimension W D H CIMR J7AU20P1 CIMR J7AU20P2 RS 2010 J7 10 0 8 82 x 50 x 194 CIMR J7AU20P4 CIMR J7AU20P7 CIMR J7AU21P5 RS 2020 J7 16 1 0 111 x 50 x 169 CIMR J7AU22P2 CIMR J7AU23...

Page 114: ...R J7 20P1 to 23 P7 L1 L2 L3 L1 L2 L3 P E Control Panel Max 20m Motor Cable U V W 1M 3 Ph E R S T E VS mini J7 Shield Cable Ground Bonds remove any paint Rasmi RFI Filter Ground Bonds remove any paint...

Page 115: ...B0P1 to B1P5 L N L N P E Control Panel Metal Mounting Plate Max 20m Motor Cable U V W 1M 3 Ph R S E E VS mini J7 Shield Cable Ground Bonds remove any paint Rasmi RFI Filter Ground Bonds remove any pa...

Page 116: ...nd proper handling must be observed Climatic and environmental conditions must conform to the requirements of prEN 50178 Installation The converters must be installed and cooled in compliance with the...

Page 117: ...d listed below The products conform to these standards listed below The products conform to these standards listed below The products conform to these standards subject to due and proper observation o...

Page 118: ...TRIC KOREA CORPORATION Paik Nam Bldg 901 188 3 1 Ga Euljiro Joong Gu Seoul Korea Phone 82 2 776 7844 Fax 82 2 753 2639 YASKAWA ELECTRIC SINGAPORE PTE LTD Head Office 151 Lorong Chuan 04 01 New Tech Pa...

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