Bungard DL 500 User manual

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1. Preface
With the this instruction we would like to give an
overview about structure, function and operation
of the conveyor spray etching machine DL500..
Please read the following te t carefully and partic-
ularly consider the references to job safety and
set-up. Deposit this instruction at a safe place. It
contains information on maintenance or cleaning,
which you will need later on as well.
If you encounter a problem which is not answered
by this manual, please contact us by phone or by
mail. This will enable us to give specific advice
and analyse malfunction if this ever occurs.
The machines are manufactured by Bungard
Elektronik, Rilkestraße 1, D-51570 Windeck and
brought into circulation in the EEC-MEMBER
countries by the respective retailers/contracting
parties.
Operational areas:
aqueous-alkaline or sour etching of printed circuit
boards.
Developing of positive or negatively working,
aqueous-alkalinely processable fotoresists or
laminates (if necessary add antifoaming agents).
Alkaline resist stripping (additional filtration unit
necessarily).
2. Safety Instructions
The machines are intended for the chemico-
physical treatment of printed circuit boards.
The machines are not intended to be integrated
or connected with other machines or plants. They
may be operated only in appropriate areas and
run only by qualified technical personnel. Children
and domestic animals are to be kept away!
Electric
The machine is manufactured using certified
parts according to the usual guidelines for elec-
trical security. This does not release the user
however of its duty to e ercise diligence while
handling electrically operated devices.
Before all maintenance work on the machine
(filling, emptying, cleaning etc.) switch off the
machine and pull power supply plugs.
DL 500
Etching Machine
Instructions for Use
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]

Seite 2 / 12
Pay increased attention to electrical defects be-
cause of the conductivity of etching solution con-
taining metal salts. In this a case pull the plug of
the machine and replug only after professional re-
pair. This is also valid for spilled etching agent.
There are parts under voltage in the cable chan-
nel and in the control unit. The cable to the pump
motor may carry bracing from the condenser.
Wait for retension before touching these parts.
Personal protection equipment
While handling etching agents, thus in particular
when filling and emptying the machine, wear usu-
al protection equipment, like apron, gloves and
eye protection.
Temperature
The machine may be switched on only with filled
etching agent chamber. The quartz glow bar must
be always sufficiently covered with etching agent!
Uncovered glow bar may cause destruction of
machine! Fill the etching chamber up to 1 cm un-
der the cover of the medium container.
The electronic thermostat is secured against
break and short-circuit by the thermo sensor. This
does not release the operator however of the ob-
ligation to supervise the temperature of the etch-
ing agent: Perhaps e othermic chemical reac-
tions can lead to overheating of the etching
agent. The ma imally permissible operating tem-
perature of the machine amounts to 50° C.
If the etching agent is prepared by release from
salts or mixing liquids, this must always take
place outside of the machine! ay attention to
the safety references of the chemical manufac-
turer as well.
Before use of etching agents, whose chemical re-
action behavior is or might be e othermic, please
coordinate additional measures against overheat-
ing with us.
If despite all precautionary measures an over-
heating of the etching agent should arise, the
heating must be switched off at first. The etching
agent pump must remain however switched on,
so that the etching agent is cooled by the circula-
tion.
Place of assembly
Requirement according to WHG and/or supervi-
sion of trade: In order to prevent the penetration
of etching agent into the ground, the machine
must be installed a) in a sufficiently large area
with chemical-firm, waterproof ground lining (no
tiles, no concrete!) or b) in a chemical resistance,
waterproof collecting tray, which seizes the entire
volume of the etching liquid. We offer such a tray
as an option.
Personal security
The DL 500 is equipped
with a protective switch
mounted to the cover (1).
This will turn off the pump
as soon as the cover is lif-
ted. You should temporarily
check the function of this switch: Close the valve
of the feeding tube from the medium container to
the etching zone completely (!). Switch in the
pump. When you lift the hood for more than 3
mm the pump must switch off.
Exhaust air
We recommend to install an e haust above the
machine for eventual etching steams. This re-
commendation is however purely precautionary.
Leakage of aggressive steams could not be
proven in two independent investigations. (water
vapour escapes, the salts of the etching agent
remains in the solution).
The machine possesses at the back of the rinsing
compartment a pipe socket, which can be con-
nected to the e haust air system of the building.
The ventilating outlet is consciously not arranged
at the etching zone, in order to prevent that e -
cept steams also liquid etching agent can arrive
into the e haust air system.
DL 500
Etching Machine
Instructions for Use
(1)
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]

Seite 3 / 12
Environmental protection
Used up etching agent is special refuse. It must
be handed over to certified disposal enterprises
under indication of the waste key number. Pay at-
tention to the refuse laws and regulations of your
country. We are not authorized to redemption.
Waste water
Prior to operating the machine, be informed on all
applying environmental protection legislation of
your country. Used etching liquid contains copper
and must be treated as special waste. In most
countries, this applies also for the rinse water.
We recommend that you collect dirty rinse water
and use it to set up fresh etching liquid. In accord-
ance to anti pollution laws, the final cleaning of
the boards normally requires a cascade rinsing
unit, or further wet process steps, like chem. tin-
ning or resist stripping. Any attempt to neutralize
the etchant or the rinse water is NOT recom-
mendable to other than approved chemists.
We recommend to use the rinsing unit of the
DL500 either in a closed cycle or have the rinse
water run over a waste water treatment like the
Bungard IONEX.
3. Technical Data
Electrical
connection:
220 V~, 50 Hz, ca. 1.5 kW
imensions ca. 110 X 100 60 cm (B H T)
Max Board
Size:
510 mm endless
Fill Quant-
ity:
ca. 55 l Etching Agent
Weight: ca. 100 kg
Material: PVC, PP, Titan
Width of the
board gap
510 mm
Conveyor
speed
Stepless adjustable 0 - 1.5
m/min
Pump Centrifugal pump delivery rate
ca. 200 l/min, spray pressure
stepless adjustable by valve
Heating 1000W Quarz glow bar
Speed of
Etching
ca. 35µm in 90 s
Technical changes reserved.
4. Construction
(2)
The machine body is made from PVC. It is di-
vided into infeed-, etching-, rinsing- and outfeed-
zone. The removable media tank is located in the
pedestal of the machine (2).
The cover is made from
grey and transparent
PVC. It carries housings
to fi the removable parti-
tion walls.
The media tank is easy
to access and can be en-
tirely removed from the
machine (3). The top
cover of the tank carries the pump. This is a sub-
mersion centrifugal pump which propels with
DL 500
Etching Machine
Instructions for Use
Base with
Medium
Container
Control
Panel
Cover
Exit Zone
Intake Zone
Etching
Chamber
insing
Zone
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]

Seite 4 / 12
highpressure the etching medium to the 4 mani-
folds, each of them equipped with 14 flat spray
nozzles. The liquid returns to the tank via 2 PVC
drain pipes of big diameter. The tank carries a
1000 W heater element and the temperature
sensor.
The conveyor system is
made from 13 pairs of
PVC covered rollers and of
one infeed and outfeed
roller at each end of the
machine (4). The squee-
gee rollers are covered
with a sponge cloth each.
Using an endless belt, the
rollers are directly coupled to a gear motor.
The water access to the
rinsing compartment is
controlled by both a mag-
netic and a manual oper-
ated valve. The magnetic
valve opens only when the
etching pump is operating.
A circuit rinse or a down-
stream rinsing water treat-
ment are as an option available (5).
The control unit is mounted on top of the machine
(6). To permit easy
access from each
side of the ma-
chine, it can be
turned into almost
any position. The
front panel carries
illuminated
switches for the main supply, pump, conveyor
and heating circuits as well as a potentiometer for
conveyor speed adjustment and the digital-reed-
out thermostat.
5. Setting Up
Observe please the order of the steps to start-up
e actly and attach the machine only after filling to
electricity mains. Consider also the safety refer-
ences.
1. Check it for any damage immediately
after reception and if damages are dis-
covered contact us and the transport
agent to state the facts of damage.
2. The machine is fi ed to the transport con-
tainer or to the palette by plastic tapes.
Remove all packing material and tapes
from the cover, the control unit and the
medium tank.
3. To avoid damage, do not move the ma-
chine on the ground. With the help of at
least one other person, carry it to the de-
sired location. The best possibility to
handle the machine is to hold it at the left
and right side walls on each end.
4. The location must fit the labour protection
requirements for etching machines, i. e.
ventilation, sealed floor etc. It must
further offer power and water installation
close-by.
5. The place must be straight and even. It
must carry the entire bottom of the ma-
chine (no palettes!). With respect to an
easy feeding and a good access also to
the back side of the machine, there
should be a free area of about 2m 2m.
6. The boards are passing the machine
from the right to the left, if seen from the
closed side of the pedestal (front side).
7. Make sure that the
drain valve for the
etching agent is
closed (7). Install
the drain and the
supply hose for
the rinsing zone.
The inlet is from
the rear seen left.
DL 500
Etching Machine
Instructions for Use
(4)
(6)
(5)
(7)
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]

Seite 5 / 12
5.1 First Filling
As a check for tightness and function you should
operate the machine first only with water. After
successful test run the water is replaced by etch-
ing agents. If the medium container was de-
mounted for transport, put it back into its posi-
tion, bolt the connections of the two gutter-pipes
and the tubing and connect the plug contacts for
thermostat, heating staff and engine (plug are
permutation implemented). You can give the wa-
ter through the opening in the cover (filling height
is appro . 1 cm under cover of the medium con-
tainer).
5.2 Check
Before connecting the machine to the power sup-
ply, please check:
The conveyor belt must run parallel to the side
walls of the machine. All upper rollers must lay
close on the lower ones.
If the cover has been taken off the machine, the
intermediate walls and the cover must be
remounted. Take care to mount the cover in a
way that it sits well all on the machine body and
that the security switch is closed.
Check if all fittings are well attached and if all
appropriate valves are closed. If necessary,
tighten the fittings manually.
With respect to the built-in stoppers, move the
control unit to the desired position.
5.3 Electrical connection
Switch off all the switches on the front panel. Turn
the adjustment knobs of the conveyor belt and
the thermostat to zero position. Connect the
power plug to a splash water-protected wall sock-
et. The machine's power consumption (with the
heater running) is about 1.9 kW on 220 V, 50 Hz.
We assume that an appropriate fuse has been in-
stalled to the in-house power circuit.
Now turn on the main switch. It will be lit.
5.4 Test Run
Referring to the description in chapter 4, check in
the below given sequence the function of the con-
veyor, the heater, the pump and the rinse. Pay
special attention to the following topics:
Conveyor
The belt and the rollers must move in a steady
and uniform way. At position 1 on the scale, the
conveyor must just transport a board through the
machine.
Pump
When running the pump, have a close look on the
fittings and the cover. No leaking should be obvi-
ous.
There is a valve in the
mounting pipe fed by the
pump (8). This valve can
be used to reduce spray
pressure, if necessary. A
very low pressure also per-
mits to see if all nozzles
are operating and spray in
the right direction. See
chapter 8.5 for details on
how to adjust the manifolds.
Heater
If any 'abnormal' temperature read-out appears
on the thermostat, check the cable connector to
the sensor.
When the heater is on the quartz tube will shine
in a red to orange colour and the switch at the
control panel will be lit.
Rinse compartment
Check if there is sufficient, but not too much wa-
ter. Pressure is good if the lower jets almost
reach the cover. See if the descent to the drain is
sufficient. If not, the water floods the rinsing com-
partment and e its into the etching zone.
DL 500
Etching Machine
Instructions for Use
(8)
Bungard Elektronik GmbH & Co. KG, Rilkestraße 1, 51570 Windeck – Germany
Tel.: [phone], Fa : +49 (0) 2292/6175, E-mail: [e-mail]