Shenzhen LWX-20 Service manual

Safety classification

 Protection against electric-shock:

Class I Equipment- type B application

 by operation mode

Intermittent loading, continuous operation

 The equipment cannot be used with flammable anesthetic gas mixed with air

or oxygen or nitrous oxide

Safety symbols

Symbol Content

Attention, consult accompanying documents.

Type B equipment.

Dangerous voltage.

X-ray radiate.

Ground.

Ionizing radiation.

Large spot.

Small spot.

This symbol indicates that the waste of electrical and electronic equipment must not be disposed as unsorted municipal waste and must be collected separately. Please contact an authorized representative of the manufacturer or an authorized waste management company for information concerning the decommissioning of your equipment.

Advisory Messages

Danger: Indicates an imminently hazardous situation which, if not avoided, will result death or serious injury. This signal word is to be limited to the most extreme situations.

Warning: Indicates a potentially hazardous situation which, if not avoided, could result death or serious injury.

Caution: Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may also be used to alert against unsafe practices.

Note: Indicates information or a company policy that relates directly or indirectly to the safety of personnel or protection of property. This signal word is associated directly with a hazard or hazardous situation.

Limited Condition For Transportation and Storage

Packed products may be stored up to 15 weeks in conditions as follows:

1. Environment temperature：-20～+45℃

2. Relative humidity range：20～80% no condensation

3. Range of atmospheric pressure ：700～1060hPa

4. stored indoor without corrosive gas and with proper ventilation

iii

Please contact your supplier of the manufacturer for repairs and maintenance if there is

any trouble of machine.

Manufacturer: Shenzhen Landwind Industry Co.,Ltd.

Address: 4F,Block E, Bijing Bldg.81, jingtian Road, Futian District, Shenzhen China

Call center: 400-700-3788

Content

Safety classification ............................................................................................................ i

Safety symbols ................................................................................................................... i

Advisory Messages ............................................................................................................ ii

Limited Condition For Transportation and Storage ............................................................ iii

1 Installation Condition ...................................................................................................... 5

1.1 Power Requirement ............................................................................................. 5

1.2 Room Requirement .............................................................................................. 5

1.3 Protection Requirement ....................................................................................... 5

2 Working principle of generator ....................................................................................... 6

2.1 Block diagram of circuit principle .......................................................................... 6

2.2 Principle of power and switch ............................................................................... 6

2.3 Generation and control principle .......................................................................... 7

2.4 X-ray tube filament heating principle .................................................................... 7

2.5 Start up and protection principles of rotary anode ................................................ 7

2.6 kV, mA and s interlock protection principle of capacity constraint ........................ 8

2.7 Control principle of radiography duration ............................................................. 8

2.8 Control principle of common radiography ............................................................. 8

2.9 Control principle of Bucky diaphragm radiography ............................................... 8

2.10 Fault detection principle ..................................................................................... 9

3 Installation .................................................................................................................... 10

3.1 Installation of Radiography Table ....................................................................... 10

3.2 Installation of column ......................................................................................... 10

3.3 X-ray Tube Installation ....................................................................................... 12

3.4 Operation Panel Installation ............................................................................... 13

3.5 Installation of Stand chest .................................................................................. 18

3.6 Generator Installation ......................................................................................... 18

3.6.1 Installation preparation ............................................................................. 18

3.6.2 Connection between generator and tube ................................................. 19

3.6.3 Connection of generator mainframe and console .................................... 21

3.6.4 Connection of power cable ...................................................................... 22

4 Debugging and Calibration ........................................................................................... 24

4.1 X-ray debugging ................................................................................................. 24

4.1.1 Precautions in debugging ........................................................................ 24

4.1.2 Debug step by step .................................................................................. 24

4.1.3 Attentions during debugging .................................................................... 25

4.2 Collimator debugging ......................................................................................... 25

4.3 Generator debugging ......................................................................................... 25

4.3.1 Preparation before debugging.................................................................. 25

4.3.2 Rotating anode text .................................................................................. 26

4.3.3 Calibration of tube voltage ....................................................................... 26

4.3.4 Calibration of tube current ........................................................................ 27

4.3.5 Bucky text program .................................................................................. 29

4.3.6 Commissioning ........................................................................................ 29

5 Maintenance................................................................................................................. 30

5.1 Radiography Table ............................................................................................. 30

5.1.1 Regular maintenance ............................................................................... 30

5.1.2 Maintenance Record ................................................................................ 30

5.2 X-Ray Tube Assembly ........................................................................................ 31

5.2.1 Regular maintenance ............................................................................... 31

5.2.2 Year maintenance .................................................................................... 31

5.2.3 Maintenance Record ................................................................................ 31

5.3 Collimator ........................................................................................................... 32

5.3.1 Replacement of Lamp .............................................................................. 32

5.3.2 Recommended Maintenance Program .................................................... 32

5.3.3 Maintenance Record ................................................................................ 33

5.4 Generator ........................................................................................................... 33

5.4.1 Regular maintenance ............................................................................... 33

5.4.2 Maintenance Record ................................................................................ 34

6 Troubleshooting ............................................................................................................ 35

6.1 Error Codes ........................................................................................................ 35

6.2 Key point in fault diagnosis ................................................................................ 36

6.2.1 Console .................................................................................................... 36

6.2.2 Interface unit ............................................................................................ 37

6.2.3 Mainframe control unit ............................................................................. 38

6.2.4 Pulse width modulation unit ..................................................................... 39

6.2.5 Auxiliary power ......................................................................................... 41

6.2.6 ±12V auxiliary power ................................................................................ 41

6.2.7 Sampling Unit .......................................................................................... 42

6.2.8 Protection Unit ......................................................................................... 43

6.2.9 Common troubleshooting judge ............................................................... 43

7 Attached figure ............................................................................................................. 45

Medical X-Ray Radiography System

1 Installation Condition

1.1 Power Requirement

1. External power requirement: single-phase 220V, diameter of connection line for

grid- cabinet, cabinet-generator phase line and diameter of earth line shall meet

requirement of electrical safety standard. Phase line, null line and earth line in the

distribution cabinet shall be equipped with terminals.

2. Installation shall conform to relevant specifications stipulated by power supply

authorities.

1.2 Room Requirement

1. Height of room shall be not less than 3m.

2. Protection of the room shall equal to 2.5mm lead equivalent, partition wall of

control room shall be brick or XF protective panel, the door is generally enclosed

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in sheet lead, radio protection shall meet national and local protection standards.

1.3 Protection Requirement

1. The brick wall of the examination room should has a thickness of 370mm

(equate with 2mm Al), the thickness of the concrete wall should be more than

200mm.

2. The lead glass thickness between examination room and operating room should

be more than 1.5mm lead equivalent, and field of vision should not less than 0.25

㎡,with height of 900mm from ground.

3. Roof is 1.0mm lead equivalent.

4. If the room is at the bottom of building, protection measure for the ceiling is

needed; the protection should not less than 2mm Al equivalent. If the room is not

at the bottom, there is not only the ceiling but ground is needed X-ray protection,

which also requires 2mmAl equivalent. While the room is at top, it just needed to

make a protection for ground.

5. If the room is at the bottom(either cottage or building), the glass of the

examination room should use lead glass with 1mmAl equivalent or 240mm brick

wall.

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2 Working principle of generator

2.1 Block diagram of circuit principle

Figure 1 Block diagram of circuit principle

2.2 Principle of power and switch

The AC220V power connects to the mainframe via L1 and N of wiring terminal X1, and is

supplied to the inverter passing through air switch, filter, AC contact, rectifier module and

filter unit. Another line of L1 supply power to the auxiliary power supply, which outputs

+12V and -12V power to console and mainframe and auxiliary power to the driving circuit

for filament heating. After energization, the system is shutdown. When "Power On" key on

the console is pressed, the console send start orders to the mainframe which then

changes connector unit terminal X3-8 (power control terminal) to high level after receipt of

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the order, the soft charging relay K2 attracts, voltages from L1 perform soft charging to

filter unit capacitor through soft charging resistance R1and rectifier module. The charging

voltage is monitored and detected by connector unit X4-1 (“DC-”cold terminal),

X4-2(“DC+”hot terminal), , when the voltage exceeds 240Vdc, AC contact is pulled in,

voltages from L1 is sent to the inverter through AC contact, rectifier module V1 and filter

unit, and then the main power supply circuit is energized. The machine is ready for start,

X3-7 (“P_S”power status terminal) is at high level, the mainframe control unit sends

normal start signal to the console after receipt of ready-for-start signal, the whole machine

is standby.

2.3 Generation and control principle

After startup, AC 220V power is loaded on inverter after rectifying and wave-filtering; when

the console sends exposure order to the mainframe, the inverter acts, HF square wave

output is loaded on high voltage oil tank to generate high DC voltage. Voltage sampling

circuit of high voltage oil tank feedbacks sampling signals to pulse width modulation unit,

which generates real-control pulse width modulation signal to regulate high voltage and

consequently stabilizes high DC voltage.

Terminal “+kV FB” of generator oil tank top cover is feedback terminal of positive high

voltage, which outputs 1V equal to 10kV output at high voltage terminal; "“-kV FB”" is

feedback terminal of negative high voltage, which outputs -1V equal to -10kV output at

high voltage terminal.

2.4 X-ray tube filament heating principle

Generator heats the filament through pulse width modulation AC voltage. Under different

kV and mA combinations, the control procedure sends control signal of filament data

through digital analog converting circuit, this signal controls filament heating inverter to

generate pulse width modulation AC voltage on filament heating inverter. This HF voltage

excite heating of filament.

Note: Filament is in pre-heating status during standby status.

2.5 Start up and protection principles of rotary anode

Press the Prep. Key on the console key, the CPU issued a directive, rotating anode starter

terminal X5-5 is at low level, and rotating anode starter is energized to start. Rotating

anode of X-ray tube start, after 0.8-1.2 seconds, rotating anode starter automatically

switch to the running state, X-ray tube anode run normally, rotating anode starter terminal

X5-6 becomes low.

Until the exposure is finished the main control unit issued a directive, rotating anode

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starter terminal X5_5 becomes high level, rotating anode starter automatically switch to

the brake status, X-ray tube rotating anode brakes, after 8 -- 10 seconds, the speed

drops to a low value, then the brake doesn’t work any more, rotating anode starter stop

working self-motion.

If the CPU to give directions to the rotating anode starter, but because X-ray tube rotating

anode can not be rotated or not meet the normal operating voltage, the level of the

rotating anode starter terminal X5_6 is low, the host CPU detect that X-ray tube rotation

anode is not working properly, the generator will not output voltage, that radiation is

stopped, and shows on the console.

2.6 kV, mA and s interlock protection principle of capacity constraint

kV, mA and s interlock protection principle of capacity constraint is controlled by

micro-computer control system intelligent module according to tube capacity

characteristics calculation.

2.7 Control principle of radiography duration

Control circuit of radiography duration is digital circuit with double time limit function.

2.8 Control principle of common radiography

When the console is in radiography status, parameters, such as kV, mA, s/mAs values

and Bucky diaphragm are selectable on the console according to radiation condition.

When the position 1 of hand switch or the Prep. Key on the console is pressed, CPU of

main control unit sends the order after detecting the information, and then the filament

heating circuit rapidly heats the cathode filament of the X-ray tube, rotary anode driver

starts up the rotary anode of X-ray tube for operation. When the position 2 of the hand

switch or the exposure key on the console is pressed, pulse width modulation circuit

generates pulse width modulation signal to drive the inverter, which then drives the high

voltage oil tank to generate high voltage which is loaded on the X-ray tube to generate

X-ray and to perform radiography. If the hand switch or the exposure key is loosed during

radiation, the exposure radiography will immediately stop.

2.9 Control principle of Bucky diaphragm radiography

Table or vertical chest radiography stand Bucky diaphragm is selectable on the console,

when the position 1 of the hand switch or the prep. Key on the console is pressed, the

rotary anode starts up to heat the filament, and when the position 2 of the hand switch or

the exposure key on the console is pressed, control relays of Bucky diaphragm and chest radiography stand Bucky diaphragm are pulled in, the light-emitting diode V13 bright, the

Bucky diaphragm pickup winding is energized and starts to work, and pickup grid moves

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back and forth, after 0.5s latency, the radiography exposure begins, after pre-setting

exposure time, the control circuit is reset to the status as before.

2.10 Fault detection principle

Mainframe control system performs self-inspection during electrification and performs

monitoring to all units during operation of the mainframe, in case of abnormal condition,

the system may suspend in real-time, send fault information to the console and send fault

alert signal.

When the grid has phase voltage lower than 170Vac or loses phase, terminal X3-7”P_S” is

at low level, the control system may generate power fault information code "E00" after

detecting this low level, the mainframe cut off main power supply.

When the position 1 of hand brake switch or the prep. Key is pressed, the control system

will monitor filament heating circuit and anode driving circuit. The filament is heated and

temperature will be increased, if the heating current is over-low or the heating voltage is

over-high, the control system will generate default information of filament unit as "E03".

Level of X3_12“FIL CON” of filament heating inverter which on the 21003C increases,

filament heating inverter cut off, at the same time, the main power supply disconnects.

When the rotary anode is driven abnormally, level of X5_6“M_S” of interface unit

decreases, the system detects the signal and generates anode default information "E04",

the main power supply is cut off.

During exposure, if the inverter components fail due to over-current or poor connection of

power components caused by discharge in the high voltage circuit, voltage of inverter

X1_6“OC_A” or X2_6“OC_B” will decrease below 4V. The protection circuit of the

pulse-width modulation unit begins working and cuts off the PWM signal; at the same time

the inverter stop working. At this moment, the LED indicator lamp on 21003C circuit board

lit, main control unit generates an interrupt signal to terminate the exposure operation,

close the power loop power, and send the wrong message "E01" or "E02"to the console.

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3 Installation

3.1 Installation of Radiography Table

Radiography table shall be placed horizontally on the floor of room, distance between

sliding seat of column and wall shall be not less than 1m for installation of column, and

then all guide rails on the machine shall be calibrated with leveler (horizontal and vertical

directions).

Note: After lay the radiography table horizontally, the table shall be firmly attached to the ground with four expansion bolts.

3.2 Installation of column

1. Carried out the column from the box and moved to radiography table installation

location;

Note: For the column is heavy, it is needed at least four people to perform this step; and the installers must be careful to avoid personal injury or damage of the equipment.

2. Loose screw at the end-plate of the column guild with a screwdriver and remove the

end-plate;

End-plate

Limited block

Figure 2 End-plate

3. Raise the column upright slowly, slide the column sliding seat into the guild rail.

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1 Column 2 Column sliding seat 3 Back cover of column sliding seat

4 End-plate of guide rail 5 Limited block of guide rail 6 Column guide rail

Figure 3 Diagram of column installation

Warning: It is needed at least four people to perform to avoid personal injury or damage of the equipment.

4. In this case, care shall be taken to avoid impaction of electromagnet, and then limited

block shall be installed, the column shall slide easily on the guide rail without clearance.

5. Set the end-plate back onto the guild rail and fixup it with installation screws.

Warning: For the column is heavy, care shall be taken to avoid impaction of electromagnet.

Warning: When install columns, the weight inside the column will cause the tube support frame automatically rise to the top of column; in order to avoid personal injury or equipment damage, it is required that one person hold on the support frame, and then slowly released until it rise to the top.

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3.3 X-ray Tube Installation

1. Installation of tube hoop. This step takes at least two people to work at the same time.

While one pull the tube supporting frame to a suitable height and keep it, the other align

mounting holes of support frame and tube hoop, and fix up with screws.

Fixed screws

Tube rotation lock screw

Figure 4 Installation of tube hoop

2. X-ray tube installation. Pull down the tube supporting frame to a suitable height and

keep it, then lay the tube on the hoop. Gently rotate the tube back and forth, so that the

outlet port of tube vertically upward and then screw for fixing up the hoop；

Caution: In order to avoid unnecessary personal injury and equipment damage, this step requires at least three people to work at the same time.

Caution: The installer must be careful to avoid equipment damage caused by dropping of the tube.

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