Puhui T-961 User manual
Mini SMT Reflow Oven User Manual
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Features:
1. This machine selects IR and hot air heating technology controlling,
equipped with special design wind wheel, speed stability and uniform
temperature, suit for uninterrupted soldering the LED and BGAcomponents.
2. This machine is equipped with the crawler-type and six temperature zone
heating systems, and each temperature zone uses independent PID
controlling and up-down heating type, can make the inside temperature
more accurate and well-proportioned, just take about 7 minutes can let it
heat up to the working temperature from the room temperature.
3. Intelligent temperature wave heating type, oversized capacity wave
selection, have eight temperature waves can satisfy various welding
technological requirements.
4. Use programmable technology, preset the temperature wave memory
storage function, can complete the whole welding process automatically
according to your presetting wave.
5. Adopt the thermocouple temperature measurement and add the
compensation circuit, make the temperature measurement more accurate,
the wave more perfect.
6. Use PID intelligent temperature control technology; make the temperature
control more accurately. Adopt the imported large current solid-state relay
non-contact output can effectively avoid the IC or circuit board damage due
to the rapid or uninterrupted warming up, make the whole welding process
more scientific safety.
7. Transmission system adopt imported frequency conversion motor, PID
closed-loop speed, smooth operation, speed adjustable range
0-290mm/min.
8. Adopt independent wheel structure and special stainless steel strut,
durable wear-resisting runs smoothly, speed precision can reach ±10mm/min.
9. Independent cooling zone, to ensure the PCB board of low temperature
when the required.
10. Friendly human-machine operation interface, perfect LCD display, no
need to connect with the PC, can watch the whole repairing process very
clearly.
11. Ergonomic design, practical and easily operated. Good build quality but at
the same time light weight and a small footprint allows the T-961 to be easily
bench positioned, transported or stored.
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Technical parameters
Model
T-961
The heating zone quantity
upper3/down3
The length of the heating
zone
730mm
The heating type
IR and hot air heating
The cooling zone quantity
1
Maximum width of PCB board
230mm
The operation direction
left→right
Delivery options
Net transmission ＋chain
transmission
The speed of conveyer belt
0-290mm/min
The power supply
220V 50/60Hz
Peak power
3.5KW
Heating up time
Around 7mins
Temperature control range
Room temperature～300℃
Temperature control mode
PID closed-loop control
Temperature control accuracy
±1℃
PCB temperature distribution
deviation
±2℃
Overall dimensions
1000×466×445mm
Machine weight
70KG
Main parts
Complete machine
1
User manual
1
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Operating Instructions
1. Enter into the setting interface when starts the machine.(temperature zones
from left to right 1/upper 3/upper 5/upper , 2/down 4/down6/down；face the
swift of machine，(temperature zones from left to right1/upper 3/upper 5/upper ,
2/down 4/down6/down）.
2. Rotate Param button slowly to move the white cursor, when button move
counterclockwise,white cursor up. When white cursor refers to the parameters
need changed, slowly rotate value key to change parameter, when rotating
value key clockwise ,the parameter bigger,when rotating value key
counterclockwise, the parameter shrunk. The SPD is belt transmission speed
setting, PRFV is wave number set.
3. After the parameters changed, press the value button for long time, until the
screen reads “successfully”,parameters saved successfully.
4. Press param button long time to enter work interface, the oven start to run
the wave.
5. Press param button long time to return to setting interface to re-set other
waves.
6. After the wave set, only need to change the wave number of PRFV then
select the wave.
7. Six small red switch, control the six tempreture zone lamp.
Attentions:
1. Each temperature wave purposes as follows:
Wave 1 & 2: use the same with soldering the less lead paste, like 85Sn/15Pb
70Sn/30Pb
Wave 3 &4: use the same with soldering the more lead paste, like 63Sn/37Pb
60Sn/40Pb.
Wave 5&6: use the same with soldering high-melting-point Warm prompt: the
machine after shutdown, if you want to restart, the interval of at least 5 s
Wave 7&8: use the same with soldering lead-free solder in melting point, like
Sn/Ag2.5/Cu.8/Sb.5；Sn/Bi3.0/Ag3.0
According to the chips size and welding technological requirements, select the
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proper wave.
2. There are lot kinds of solder paste, every company chooses is also not
identical. For these reasons, we design this product can set eight waves, each
wave has three sections, each section of the heating time and temperature all
can alter. You can reset the heating waves according to the solder required
heating temperature and time.
Warm prompt: the machine after shutdown, if you want to restart,
the interval at least 5 s
Foundation for wave set
1. The reflow soldering theory and the temperature wave
When the PCB board goes into heat up area (dry area), the solvent and gas in
the solder paste will evaporate. At the same time, the flux can wet the pad and
the component tip and foot. The solder paste melts, caves in and covers the
pad, leading to the pad and component pins insulate the oxygen. PCB board
goes into heat preservation area. PCB board and components get full
preheating. In case of damaging the PCB and components when it goes into
the welding area and the temperature heats up quickly. When PCB board goes
into the welding area, the temperature heats up and the solder paste melts.
When PCB board goes in to cooling area, the liquid solder paste the soldering
points solidify. The reflow process is finished.
The temperature is the key to welding quality. The actual and the setting
temperature warming slope and the peak temperature should be accordant.
Before the temperature reaches 160℃, please control the heat up speed in
about 1℃/S. If heat up too quickly, the PCB board and the components will be
damaged, and the PCB board may be out of shape. On the other side, the flux
volatilizes too fast. And it is easy to make soldering tin ball. Set the peak
temperature 20℃-40℃higher than the solder paste melting point. Set the
reflow time 10S-60S. If the peak temperature is low or the reflow time is short,
it will affect the welding quality, and serious is causing the solder paste does
not melt. If the peak temperature is high or the reflow time is long, the metal
power will be oxidized and affect the welding quality and serious is causing the
component and PCB board damaged.
2. The set of the temperature wave
Set the wave according to the solder paste and the above foundation. Different
solder paste, choose and set different waves. In addition, the temperature
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wave has related to the PCB, the density and size of components. Generally
lead-free welding temperature should be higher 40℃than melting point.
Temperature Area Set
1. Set the temperature and belt speed to initial value (usually the manufacturer
supply when adjust)
2. To the cooling oven, should be preheated for 20-30 minutes.
3. When the temperature is stable, let PCB board pass heat reflow system.
Under this set, the solder paste can reach the reflow critical point. If there is no
reflow, to operate as step 4. If the reflow is too fast, please keep correct
proportion to increase or reduce the temperature. And let the PCB pass the
system again until reach the reflow critical point. Then turn to step 4, only when
there is reflow that is good.
4. If there is no reflow, please reduce the belt speed. For example, now the belt
speed is 500mm/min, please adjust it to about 460mm/min. Usually, reduce the
speed 10% can increase the temperature about 30F. Another way is that, do
not adjust the speed, and increase the temperature properly. The increase
range standard is the temperature wave. Adjust the temperature on the basis
difference between PCB actual and standard temperature. The adjust range is
about 5℃.When adjust the temperature, it cannot exceed the PCB and
component bearing capacity.
5. Let the PCB board pass the reflow system in the new speed or new set
temperature. If there is no reflow, back to step 4 to adjust again. Or carry out
the step 6 for temperature fine-turning.
6. The heat temperature wave is adjustable according to the PCB board. You
can adjust the transmission belt speed to adjust the temperature. Reduce the
belt spend can increase the product heat temperature. On the contrary, you
can reduce the product heat temperature.
7. Attention: if there is components on the PCB, the PCB pass the reflow and it
reflow not very completely, suggest you adjust then reflow again. Usually this
cannot damage the components.
8. From low to high when set temperature. If the heat range is over the reflow
temperature too high, should increase the transmission speed or reduce the
set temperature. The detailed operation is opposite to step 4.
Equipment Installation
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1. Set up field.
1.1. Please do the work in the clean environment condition.
1.2. Do not put the machine near the electromagnetism interfering resource.
1.3. Do not put the oven exits and entrances face towards to the fan and the
window.
2. Power supply
Please use system 220V. Ensure the machine contacts the earth well and
requested professional electrician operation.
3. Adjust the reflow oven height.
By adjust the machine leg to adjust the height. The way is follow: use
industrial or alcohol gradienter to measure. Then adjust the machine leg to
adjust the dryer on all sides till it is completely horizontal.
4. Caution:
4.1. The working environment should be clean. So the welder quality is
good.
4.2. Do not use and store the machine out of door, high temperature and
humid condition.
4.3. During operation take care of the high temperature, avoid scald.
4.4. When overhaul the machine, please cut off the power supply to avoid
electric shock or cause short circuit.
4.5. If move the machine after overhaul, must check all the parts, especially
the net-belt position. Cannot make it be lock or fall off.
4.6. Ensure the machine is stable, not lean or instable. Adjust the leg under
the machine to keep the transmission horizontal. Or the PCB will shift in the
transmit process.
4.7. Do not put too big and big absorbed heat components into the oven
avoiding damage the net-net and affect the temperature.
4.8. Put lubricating oil into the transmission chain every 7 days.
4.9. Do not put the inflammable and explosive dangerous goods near the
reflow oven.
4.10. Do not reach hands into the reflow oven when the machine is in normal
working condition.
Daily Maintenance
1. Keep the electrical control cabinet clean.
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2. Check if the fan shaft sleeve is in good condition.
3. Check if the fan and the electro-motor rotate without abnormal noise.
4. Check if the fan works smoothly.
5. Check if there are no foreign matters in the air passage.
6. Check if the transmission net-belt is in good condition.
7. Check if the electrical chest and electrical equipment work without abnormal
noise.
8. Check if the transmission parts are in good condition and work without
abnormal noise.
9. Before turning on the machine, please check that the supply voltage is
stable and in the range of rated voltage to ensure that all the parts can work
safely and normally. Before running the reflow program, check that all the
parameters have no difference with your ideal ones. Before turning off the
machine, turn off the heater switches first，and do not turn off the transmission
motor switch until the air inside the heating chamber is completely cool。
10. Lubricate the driving rolls every two months.
11.Due to the long time and high temperature working environment，the motor
bearings should be lubricated twice a week or more, to ensure that the
transmission mechanism works normally.
12. Power supply must be firmly grounded.
Routine maintenance
1. Keep the oven clean, and make sure there is no foreign matter blocking the inlet and
the outlet.
2. Make sure the cooling fans work well.
If you set the heating temperature parameters to high values and the oven often works
for a long time, you should oil the driving gears with high-temperature greases termly .
1) Driving motor
Chain block
Flywheel
Motor fastening
bolts
Motor shaft
wheel
Driving chain
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2) Driving rolls and Diamond bearing seat
Toolkits list
Name
Model
Number
Solid wrench
24
1pc
Allen wrench
2、3、4、5、6、8
1set
Cross head screwdriver
75*5
1
Mesh belt
8
Jackscrew
M4*10
2 pcs
Fuse
10X38 20A
1pc
Driving shaft
Driving rolls
Diamond
bearing seat
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