LESITE LST800 User manual

Lesite Providing best plastic welding tools
Fuzhou Lesite Plastics Welding Technology Co.,Ltd
Website：www.lesiteweld.com
Email: [email protected]
Mob: [phone]
Add:16th building, Juyuanzhou Park,
Jinshan Industry Area, No.618 Jinshan Road
Cangshan Area,
Fuzhou, Fujian, China
Tel:：[phone]
Fax：[phone]
Hot Wedge Welder
User’s Guide for LST800/800D

Lesite Providing best plastic welding tools
Fuzhou Lesite Plastics Welding Technology Co.,Ltd
Website：www.lesiteweld.com
Email: [email protected]
Mob: [phone]
Add:16th building, Juyuanzhou Park,
Jinshan Industry Area, No.618 Jinshan Road
Cangshan Area,
Fuzhou, Fujian, China
Tel:：[phone]
Fax：[phone]
Please read this manual carefully before using this machine, and retain it for future reference.
LST800/800D geo-membrane welding machine is our new developed products, which can weld
geo-membrane of various thicknesses and are applicable for welding of all thermal-fused material such
as LDPE, PVC, HDPE, EVA, and PP and so on.
The control of this series of welding machine adopts PID automatic thermostatic control with high
control accuracy and low temperature fluctuation; speed control adopts PWM automatic voltage and
speed regulation circuit, driven by DC servo motor, with great output torque and the operating is stable. It
can maintain a constant speed on the condition of creeping, vertical creeping and variable road load.
Also this series of welding machine is stable in performance despite of external temperature and voltage
variation.
This series of welding machine is excellent in performance and easy for operating, with high welding
speed and good work quality. It is extensively used in engineering projects such as expressways, tunnels,
reservoirs, waterproof of construction and so on
1. Technical parameters
Voltage (V): 220V or 110V
Frequency (Hz): 50Hz
Power (P): 800W
Welding speed (V): 0.8-6m/min
Heating temperature (T): 0-450℃
Thickness of material to be welded: 0.2mm-1.5mm
Overlap width: 100mm (or 120, 150, 200mm)
Welding width: 12.5mm×2, interior cavity 12mm
Seam strength: ≥85% base material (tensile resistant in shear direction), complete machine
Dimensions: L32 x W15cm xH22cm
Net Weight: 4.8kg, Gross Weight: 8.5kg
Insulation class: class II

Lesite Providing best plastic welding tools
Fuzhou Lesite Plastics Welding Technology Co.,Ltd
Website：www.lesiteweld.com
Email: [email protected]
Mob: [phone]
Add:16th building, Juyuanzhou Park,
Jinshan Industry Area, No.618 Jinshan Road
Cangshan Area,
Fuzhou, Fujian, China
Tel:：[phone]
Fax：[phone]
2. Precautions
1). For correct operation, please carefully read this instruction.
2). Use with grounded 3-cords mains cable and socket (socket with 10A capacity. On the
corresponding welder, phase L connected to live wire, N to zero line, phase ╧ to grounded
protection line), plug will not be modified without prior permission.
3). For good welding quality, please assign specified personnel for operation.
4). Pressure roller will not engage on free running.
5). Do not operate when it is exposed to water to prevent inferior quality.
6). The machine has been regulated before leaving factory. Please do not adjust it at will.
7). Circuit board in control box is electrified. Do not remove it without prior notice to authorized
personnel.
8). Preheat for 30 minutes before start up if machine has been long unused or exposed to moisture.
9). Modifications may be made for continuous improvement, without prior notice.
3．Main Components:

Lesite Providing best plastic welding tools
Fuzhou Lesite Plastics Welding Technology Co.,Ltd
Website：www.lesiteweld.com
Email: [email protected]
Mob: [phone]
Add:16th building, Juyuanzhou Park,
Jinshan Industry Area, No.618 Jinshan Road
Cangshan Area,
Fuzhou, Fujian, China
Tel:：[phone]
Fax：[phone]
4. Operation principle
Motor drives upper and lower pressure rollers to rotate through reduction gearbox and chain. Slide
carriages drive the hot wedge and insert it between the two base materials, at the same time lever
presses pressure rollers and engages the two fused base materials.

Lesite Providing best plastic welding tools
Fuzhou Lesite Plastics Welding Technology Co.,Ltd
Website：www.lesiteweld.com
Email: [email protected]
Mob: [phone]
Add:16th building, Juyuanzhou Park,
Jinshan Industry Area, No.618 Jinshan Road
Cangshan Area,
Fuzhou, Fujian, China
Tel:：[phone]
Fax：[phone]
5. Operating regulations
As welding quality is direct related to speed and temperature setting during operating, so welding
machine must be specified personnel operated to reach excellent quality and high efficiency.
1). Use with grounded 3-cord mains cable and 3-hole socket with capacity not less than 10A (socket
corresponds with welder plug, phase L connected to live wire, N to zero line, phase ╧ to grounded
protection line), confirm that external lines have been well connected. Check that power is on off state
and regulate temperature control potentiometer and speed control potentiometer to 0 position, press
lever handle down to disengage pressure roller, then insert the plug.
2). Turn on the power and select certain temperature and speed, take several narrow materials for
try welding. Temperature selection may be different for the same material at different ambient
temperature and material thickness. To determine the best welding effect, adjust the speed to
approximately 2m/min, and then fine increase it from low to high temperature (approximately
250℃-350℃).
3). Judge on welding temperature: for transparent PE material, judge by direct observing, speed and
temperature will be appropriate if welding mark is flat and in transparent glass form; temperature will be
too high and speed be too slow if mark is heavy broken; temperature will be low and speed be fast if mark
is not transparent and with white. For opaque material, observe if there is obvious welding mark, also
tensile test can be made after complete cooling.
4). flatly and straightly trim the weld edges and frontage faced, with lower left and upper right
Fig.4

Lesite Providing best plastic welding tools
Fuzhou Lesite Plastics Welding Technology Co.,Ltd
Website：www.lesiteweld.com
Email: [email protected]
Mob: [phone]
Add:16th building, Juyuanzhou Park,
Jinshan Industry Area, No.618 Jinshan Road
Cangshan Area,
Fuzhou, Fujian, China
Tel:：[phone]
Fax：[phone]
overlapped. The overlap width is 100mm.
5). After temperature and speed have been determined, insert material to be welded between the
two pressure rollers, make machine body parallel with edges of base materials and engage press lever
handle for proper motion. Generally, only observation of deviation between welding mark and base
materials is needed for operator, and timely make correction on small degree.
6). When welding will be ended, timely press lever handle to disengage upper and lower pressure
roller to prevent rubber wheel damage for long duration.
7). Excessive temperature high and low may occur because of thermal inertia. On this condition,
temperature deviation may be compensated by speed regulation on a small degree.
8). A “T” shape overlap is formed between welded material and another material. Welding method is
shown as fig.5, tightly butt the overlap head of hot wedge against weld mark, and beveling cut length is
approximately 100mm.
Fig.5“T”shape welding diagram
6. Replacement of components
1). Replacement of hot wedge assembly
Remove the front end covering, remove the 4-M4 screws and tapping screw, remove a half housing,
release 4-M3 screws, remove the 2-M5 screws that connect heating support and slide carriage, remove
hot wedge and replace with a new one, and reassemble the complete machine (shown as fig.6). Note:
conform to color on wiring.
(Refer to fig.10 and text information)

Lesite Providing best plastic welding tools
Fuzhou Lesite Plastics Welding Technology Co.,Ltd
Website：www.lesiteweld.com
Email: [email protected]
Mob: [phone]
Add:16th building, Juyuanzhou Park,
Jinshan Industry Area, No.618 Jinshan Road
Cangshan Area,
Fuzhou, Fujian, China
Tel:：[phone]
Fax：[phone]
Fig.6
2). Replacement of control box
Remove all screws on plastic housing, remove housing by removing front end covering, screw off
the 4-M3 screws that connect control box to rear base and pull out control box. Loosen the 8-M3 turn
buckle screws on the two sides, remove the control box and replace a new one, reassemble the
complete machine (shown as fig.7). Note: conform to color on wiring. (Refer to fig.10 and text
information)
Fig.7
3). Replacement of motor
Remove all screws on housing, remove front end covering to remove housing, remove the 4-M5
installation screws on the support, remove the main chain guard and separate the upper and lower
support. Remove the covering on the bottom of upper support and weld connection between motor and
fuse holder, screw off the 2-M5 installation screws of the motor, take off motor and replace a new one.
Tapping screw
4-M5
installation
screws
Front end
coving
4-M3
turnbuckle
screws
4-M4 screws
Rear base of
control box
8- M3 turn
buckle
screws

Lesite Providing best plastic welding tools
Fuzhou Lesite Plastics Welding Technology Co.,Ltd
Website：www.lesiteweld.com
Email: [email protected]
Mob: [phone]
Add:16th building, Juyuanzhou Park,
Jinshan Industry Area, No.618 Jinshan Road
Cangshan Area,
Fuzhou, Fujian, China
Tel:：[phone]
Fax：[phone]
Weld back the removed wires and reassemble on the opposite sequence (Note: keep upper and lower
pressure roller is parallel during assembling.).
4) Replacing of upper and lower pressure roller
Remove the chain guard, take off the forcing off screws on the two chain wheels and then remove
chain wheel and chain. For upper rubber wheel, it can be removed if the two screws on bearing housing
that on both sides of press plate are removed. For lower rubber wheel, it can be removed if the bearing
on one side of chain wheel. Reassemble them in the same method.
7. Control schematic diagram and motor wiring diagram (Fig.9 &

Lesite Providing best plastic welding tools
Fuzhou Lesite Plastics Welding Technology Co.,Ltd
Website：www.lesiteweld.com
Email: [email protected]
Mob: [phone]
Add:16th building, Juyuanzhou Park,
Jinshan Industry Area, No.618 Jinshan Road
Cangshan Area,
Fuzhou, Fujian, China
Tel:：[phone]
Fax：[phone]
8. General troubles and eliminations
Motor not run
Power off
Check that the mains is in On condition
Fuse damaged
Replace fuse
Speed control circuit board
damaged
Replace speed control circuit board or control box
assembly
Motor burned
Replace motor
Motor speed can’t
be regulated
Speed control knob is
loosened
Tighten speed control knob

Lesite Providing best plastic welding tools
Fuzhou Lesite Plastics Welding Technology Co.,Ltd
Website：www.lesiteweld.com
Email: [email protected]
Mob: [phone]
Add:16th building, Juyuanzhou Park,
Jinshan Industry Area, No.618 Jinshan Road
Cangshan Area,
Fuzhou, Fujian, China
Tel:：[phone]
Fax：[phone]
Power tube disruption
Replace power tube or control box assembly
Hot wedge do not
heat
Tubular electric heating
element damaged
Replace hot wedge assembly
Thermocouple failure
Replace thermocouple
Temperature control knob
loosened
Tighten temperature control knob
Temperature control circuit
board damaged
Replace temperature control circuit board or control
box assembly
Hot wedge is
burned red
Thermocouple failure
Replace thermocouple
Controlled silicon disruption
Replace controlled silicon or control box assembly
Chain jumping
There may be sand or small
stones on chain and gear
Remove sand or small stones
9. Maintenance
The complete machine should be cleaned, greased and placed in a dry place if it is not used.
For PVC welding, the adhesions on hot wedge should be cleaned off if it is not used longer than 4
hours to prevent wedge corrosion and service life being shortened.
Recommend: for welding of material that corrosive gas may be produced after hot fusing such as
PVC and the like, stainless steel hot wedge (optional accessory) is preferred for extending of service life.
10. Supplied accessories
Protector tube 4A 2 pcs
1A 2 pcs
Cross rubber pad for coupling 1 pcs
Philips driver 1 pcs
Inner hexagonal spanner 3 pcs
Silica gel wheel 1 pair