Shenzhen LWX-50 Service manual
Hazard Messages
In this manual, the following safety symbols are always used. Prior to the operation of this
equipment, users should be familiar with these symbols and their meaning.
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.
Safety classification of the equipment
Protection against electric-shock:
Class I Equipment- type B application
Extent of protection against harmful water: General equipment
Degree of Safety in the presence of Flammable Anesthetics Mixture with air or
with oxygen or with nitrous oxide: Not suitable for use in the presence of
Flammable Anesthetics Mixture with air or with oxygen or with nitrous oxide.
Working system: continuous operation with intermittent load
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Safety symbols
Symbol Description
Attention, consult accompanying documents.
Alternating current.
AC power.
Dangerous voltage.
Ionizing radiation.
Type B equipment.
Ground.
Large focus.
Small focus.
X-ray radiate.
Power On.
Power Off.
Emergency Switch.
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.
ii
Limited condition for transportation and storage:
1. Environment temperature：-20～+45℃
2. Relative humidity range：10～80% no condensation
3. Range of atmospheric pressure ：700～1060hPa
4. Conforming to the standard YY91099-2007
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
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Contents
Hazard Messages ....................................................................................................... i
Safety classification of the equipment ......................................................................... i
Safety symbols ............................................................................................................ ii
Chapter I General ........................................................................................................ 5
1.1 Installation environment conditions: ..................................................................... 5
1.2 Space requirements ............................................................................................ 5
1.3 Power requirements ............................................................................................. 6
Chapter II composition of the product and parameters ............................................... 7
2.1 Product composition structure .............................................................................. 7
2.1.1 Radiography table control system .............................................................. 7
2.1.2 High-Frequency and High-Voltage mainframe system ............................... 7
2.2 Main properties and technical parameters .......................................................... 8
Chapter Ⅲ Working principle .................................................................................... 10
3.1 Block diagram of circuit principle ........................................................................ 10
3.2 Principle of power and switch ............................................................................. 10
3.3 Generation and control principle ......................................................................... 11
3.4 X-ray tube filament heating principle ................................................................... 11
3.5 Start up and protection principles of rotary anode .............................................. 12
3.6 kV, mA and s interlock protection principle of capacity constraint ...................... 12
3.7 Control principle of radiography duration ........................................................... 12
3.8 Control principle of common radiography ........................................................... 12
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3.9 Control principle of Bucky diaphragm radiography ............................................. 13
3.10 Fault detection principle ................................................................................... 14
Chapter Ⅳ Installation Instructions ........................................................................... 15
4.1 Unpacking inspection ......................................................................................... 15
4.2 Installation Flow ................................................................................................. 15
4.3 Mechanical Installation ....................................................................................... 15
4.4 Cable connection ............................................................................................... 23
4.4.1 Connection between generator and tube ................................................. 23
4.4.2 Connection of common radiography machine Bucky diaphragm ............. 25
4.4.3 Connection of vertical radiography stand ................................................. 26
4.4.4 Other connections .................................................................................... 27
4.4.5 Connection of generator mainframe and console .................................... 27
4.4.6 Connection of generator mainframe and power ....................................... 28
Chapter Ⅴ Calibration instructions ................................................................................ 32
5.1 Collimator calibration ......................................................................................... 32
5.2 Chest plane center alignment ............................................................................ 32
5.3 Tube calibration .................................................................................................. 32
5.4 Generator Calibration ......................................................................................... 32
5.4.1 Preparation before debugging.................................................................. 32
5.4.2 Test of rotary anode ................................................................................. 34
5.4.3 Calibration of tube voltage ....................................................................... 34
5.4.4 Calibration of tube current ........................................................................ 35
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5.4.5 Test Bucky diaphragm .............................................................................. 37
5.5 Commissioning .................................................................................................. 37
Chapter Ⅵ Maintenance ................................................................................................ 38
6.1 Operator Maintenance ....................................................................................... 38
6.2 Overhaul ............................................................................................................ 39
Chapter Ⅶ Troubleshooting ........................................................................................... 40
7.1 Error Code ......................................................................................................... 40
7.2 Key point in fault diagnosis ................................................................................ 41
7.2.1 Console .................................................................................................... 42
7.2.2 Interface unit（PCB 21001E） ................................................................ 42
7.2.3 Mainframe control unit （PCB 21002C） ................................................ 44
7.2.4 Pulse width modulation unit (PCB 21003C) ............................................. 45
7.2.5 Auxiliary power ......................................................................................... 47
7.2.6 ±12V auxiliary power (PCB 21021) .......................................................... 47
Chapter Ⅷ Technical description ................................................................................... 48
Attached schedule—spare parts ..................................................................................... 50
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Chapter I General
1.1 Installation environment conditions:
1. Environment temperature：10～+30℃
2. Relative humidity range：45～75% no condensation
3. Range of atmospheric pressure ：860～1060hPa
1.2 Space requirements
Checking room area: 4.2×3.8 ㎡ Standard;
Operation room area: 4.2×2.0 ㎡ Standard;
Medical X-Ray Radiography System
Service
Height of room: ≥3.0m；
Height of the door: ≥2.3m；
Width of the door: ≥1.4m；
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;
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 1200mm from ground;
Roof is 1.0mm lead equivalent.
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.
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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;
It is advised that the room should has a smooth cement floor or ceramic tiles
on the ground, if it is a wood floor, the installed location on the ground must
be reinforced, and the ground under the installation of the base location
demand of 100mm deep cement, and no less than 800 kg / ㎡ bearing.
1.3 Power requirements
1） Three-phase AC380V, 100A power switch, independent earthing line and N
line.
Voltage fluctuant range:≤10%;
Power:≥50kW;
Inherent impedance:≤0.3Ω;
Earthing impedance:≤4.0Ω;
Power line diameter≥25mm
2
;
2) It is recommend that the user should configure with a 80 kW Regulator if the
power supply is instability.
3) The hospital should be purchased a five-core copper cable with 3×25 mm ²
+2×16 mm ², which about 8.5M long.
4) The power of the device is large, please make sure the local transformer
power and density of use of the equipment before installation.
5) It is required that there must be a hole for line between operating room and
examination room. If the hold is on the ground, it must cover by 2mm Al.
6) Installation work should be carried out in accordance with related rules of
power supply department.
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Chapter II composition of the product and parameters
2.1 Product composition structure
Medical X-ray Equipment is mainly composed of high-frequency high-voltage generating
device, tube, collimator, Radiography table and Radiography table control system.
Different configurations and performances are provided according to customer demands.
Mechanical parts of this equipment are composed of Column and Radiography table.
Integrated design of column and bed body is used in this Equipment, where the bed body
is fixed to the ground via screws, and the column is fixed onto the bed body via screws,
with horizontal and longitudinal movement of column along guide rails by using gear
bearings. X-ray tube components and Collimator are vertically mounted on horizontal
shaft of the column right above the bed body, capable for vertical movement and rotation;
film box is mounted below bed panel, capable for horizontal and longitudinal movement
along guide rails.
Mainframe system consists of high-voltage generator, control console, and X-ray tube.
2.1.1 Radiography table control system
Radiography table control system controls the longitudinal movement of the column,
vertical movement of X-ray source movement, as well as the components radiography
table horizontal movement by the circuit composed of power supply components,
integrated control panel, control panel, as well as sensors, electromagnet brake
components, etc.
Please refer to the Radiography Table for more information.
2.1.2 High-Frequency and High-Voltage mainframe system
The system contains high-voltage generator, control console and mainly provide X-ray
tube with working voltage.
1. Console
Equipped with touchless membrane key and key tone, the console is connected with
generator and other X-ray system.
2. Mainframe
Including high pressure oil tank, HF inverter, medium speed anode rotation controller
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(standard configuration), real-time controller and adaptor.
2.2 Main properties and technical parameters
Note: According to customer requirements and configurations, the equipment
may have different performances and main technical parameters, as per the
actual configuration:
Radiography
table
Generator
Grid
Tube
bed movement
range
Longitudinal ≥950mm
Transverse ≥220mm
Size of tabletop 2100mm×760mm
Height 700 mm
Movement of column and Bucky diaphragm
synchronously and manually
move
Film size 5″×7″ - 14"×17"
X-ray tube assembly vertical movement
range
X-ray tube assembly longitudinal
movement range
1100mm
1350mm
Rotation of column ±180°
X-ray tube rotates around x ray tube
support frame center
±90°
Voltage 380V AC
Power supply
Frequency 50Hz
Nominal output power 50kW
Radiography
Tube voltage adjustment
range
Tube current adjustment
range
Load time adjustment
range
40kV - 150kV
32mA - 630mA
0.003s - 6s
Size 15"×18"
Grid ratio 10:1
Line density 103
Focal distance 100cm/180cm
Maximum
Anode heat
150kHU
units
Tube Voltage 150kV
Maximum
power of tube
19kW/50kW
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Collimator
Medical X-Ray Radiography System
Target material tungsten rhenium molybdenum (RTM)
Target angle 12°
Focal 0.6/1.2mm
Anode rotating
speed (50Hz)
Inherent
filtration
2800 rpm /min
Minimum 1.2mm AL. Equivalent
Lamp timer 30s
Operation
mode
Manual
Service
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Chapter Ⅲ Working principle
3.1 Block diagram of circuit principle
Figure 3-1 Block diagram of circuit principle
3.2 Principle of power and switch
Three-phase 380V power connects to the mainframe via L1, L2, L3 and N of wiring
terminal X1, and is supplied to the inverter passing through fuse, filter, AC contact, rectifier
module and filter unit. Another line of L3 phase fees to power transformer supplying power
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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 "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 the order, the soft charging pulls in the AC contact K2,
voltages from L1, L2, L3 phases perform soft charging to filter unit capacitor through soft
charging resistance R1, R2 R3 and rectifier module. The charging voltage is monitored
and detected by connector unit X4-1 (cold terminal) and X4-2 (hot terminal), when the
voltage exceeds 420Vdc, main AC contact K1 is pulled in, voltages from L1, L2 and L3 is
sent to the inverter through main AC contact K1, rectifier module V1 and filter unit, and
then the main power supply circuit is energized. The machine is ready for start, X3-7
(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.
3.3 Generation and control principle
After startup, three-phase AC 380V 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.
3.4 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
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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.
3.5 Start up and protection principles of rotary anode
When the position 1 of hank brake switch is pressed, rotary anode starter terminal X5-4 on
21001E panel is at low level, controlled silicon V76 is energized; rotary anode winding is
energized to start. After 1 S latency, V75 stops, V77 is energized, at this moment, start-up
voltage of rotary anode winding drops from 160V to 40V for normal operation, triode V53
is energized, status terminal X 5-3 is at low level, indicator lamp on the console illuminates
and radiography preparation is completed. When the position 2 of hand brake is pressed
and after radiography, V77 disconnects, and V78 is energized, 80V pulse DC current is
loaded on anode winding till the anode stops rotation (about 10 s). If some faults impair
start up and rotation of rotary anode, the triode V53 stops, V5-3 is at high level, the
console displays fault information code E40 for anode start up fault. In this case,
radiography may not performed even after position 2 of hand brake switch is pressed, and
by this way the protection is achieve.
3.6 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.
3.7 Control principle of radiography duration
Control circuit of radiography duration is digital circuit with double time limit function.
3.8 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.
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When the position 1 of hand brake is pressed, CPU of main control unit sends the order
after detecting the information, and then the filament heating circuit of 21003C panel
rapidly heat the cathode filament of the X-ray tube, rotary anode driver of 21001E panel
starts up the rotary anode of X-ray tube for operation. When the position 2 of the hand
brake switch is pressed, pulse width modulation circuit of 21003C panel 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 brake switch is loosed during radiation, the exposure radiography
will immediately stop.
3.9 Control principle of Bucky diaphragm radiography
a）Bucky diaphragm is vibration type: Table or vertical chest radiography stand Bucky
diaphragm is selectable on the console, when the position 1 of the hand brake switch is
pressed, the rotary anode starts up to heat the filament, and when the position 2 of the
hand brake switch is pressed, control relays of 2100 penal Bucky diaphragm and chest
radiography stand Bucky diaphragm are pulled in, the Bucky diaphragm pickup winding is
energized and starts to work, the pickup grid moves back and forth, after 0.5s latency, the
control relay of table Bucky diaphragm or the control relay of chest radiography stand
Bucky diaphragm disconnects, the radiography exposure begins, after pre-setting
exposure time, the hand brake switch shall be loosed to reset the control circuit to the
status as before.
b）The Bucky diaphragm is power type: table or vertical chest radiography stand Bucky
diaphragm are selectable on the console, when the position 1 of hand brake switch is
pressed, control relay of 21001 E panel table Bucky diaphragm or the control relay of
chest radiography stand Bucky diaphragm pulled in, the Bucky diaphragm motor is
energized and starts to work, the grid is driven and moves back and forth, when the
position 2 of hand brake switch is pressed, radiography exposure begins, after presetting
exposure time, the control relay of table Bucky diaphragm or the control relay of the chest
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