User manual
• Also observe the safety and operating instructions of any other devices which are
connected to the product.
• Ensure that the board is put into operation correctly. Therefore, please follow the
operating instructions carefully.
• The board may not be installed in/on easily ammable materials.
• In commercial and industrial facilities, the regulations for the prevention of
accidents, as laid down by the professional trade association for electrical
equipment and devices, must be observed.
• In schools and training centres, as well as in hobby and DIY workshops, the use
of the board must be supervised by adequately trained personnel in a responsible
manner.
• Never pour any liquids above the board. There is a risk that the board will be
damaged.
• Consult an expert when in doubt about operation, safety or connection of the
device.
• Maintenance, modications and repairs are to be performed exclusively by an
expert or at a qualied shop.
• If you have questions which remain unanswered by these operating instructions,
contact our technical support service or other technical personnel.
Assembly
• For the relay board “without relay”, a suitable relay must be soldered to the board before
commissioning. The following tools and accessories are required for soldering:
- soldering iron with wet cleaning sponge
- electronic tin-solder
- small at-nosed pliers and
- an electronic wire-cutter
- a heat resistant rubber plate is recommended as a base to work on
• The assembly should only to be performed on the upper side of the circuit board (printed with
insertion). The soldering is done on the bottom side.
• During the board assembly ensure that the relay’s connection wires are bent by about 45° after
the relay is inserted. This prevents the relay from falling off when the board is turned around.
• Switch on your soldering iron or soldering station and heat up to about 320 to 400 °C
(in accordance with the tin-solder being used, plumbiferous/lead-free).
Make sure that the soldering iron is in a safe place. Burn and re hazards!
Soldering
Be extremely careful when you are soldering. The soldering iron and the soldering
tip are very hot and can cause severe skin burns.
Soldering irons are not toys for children.
Do not leave warm or hot soldering irons unattended. Fire hazard!
• Once the assembly of the board is completed, the connections can be soldered.
• Make sure that the head of the soldering iron is always clean while soldering. Always clean
the head with a wet cleaning sponge prior to each soldering.
• The soldering process should only be performed for as long as necessary and as briey
as possible. Heat the soldering point and the connecting leads with the soldering tip and
immediately add some tin-solder.
• Wait until the solder has blended neatly and remove the
soldering tip. The soldered joint should appear cone-
shaped and gleaming. (See illustration).
• Remove the protruding connecting leads above the soldered joint, using the electronics
wire-cutting pliers. Pay attention to wire ends which may y off; risk of injury!
• Recheck the soldering joints for cleanness and check for any accidentally created short-circuits.
Commissioning and use
To ensure the correct set-up and operation, please read the operating instructions
and safety instructions carefully before using the device.
You may only connect the board when the voltage supply is disconnected. Ensure
that all the circuit board components and connection leads are not carrying power.
Connecting the relay circuit board
• Operating voltage (= relay coil voltage) for the board is provided by the strip terminal marked “IN”.
• Please observe the correct polarity. + = positive, - = negative. The board must only be
operated with a DC supply.
• Connect the switch contacts using the terminals “CO/NC/NO”.
CO = Common switch contact (contact 4 or 13).
NC = Relay switching output “Normally closed contact (NCC)”. Closed when non-operative
(contact 6 or 11).
NO = Relay switching output “normally open contact (NOC)”. Open when non-operative
(contact 8 or 9).
For information on the switching capacity, please refer to the technical specications.
Operating instructions
Relay Circuit Board REL-PCB 3
Item no. 1570051 without relay
Item no. 1566297 with relay 5 V/DC
Item no. 1566298 with relay 12 V/DC
Intended use
The relay circuit boards are intended for use in print relays with a coil voltage of 4 - 30 V/DC.
The version of the board “without relay” is intended for use as a universal component in
series of circuit board relays with corresponding printed image (a list of suitable relays
currently in Conrad Electronic’s product line, can be found under the relevant relay unit at
www.conrad.com). The versions “with relay” have already been provided with a relay for the
corresponding nominal operating voltage. Connection is made easier by screw contacts on the
plate. The maximum switching capacity must not exceed the value given in the technical data.
The board must be installed completely in a casing where it is protected from being accidentally
touched.
Assembly and commissioning may only be carried out by a specialist, who is familiar with the
relevant regulations and the associated risks.
Assembly on DIN rails is also possible, by using additional optional components.
If several relay circuit boards are stringed together on a module support, spacers
(Order No. 503340) are required, due to lack of space and in order to comply with the Electrical
Safety Regulations.
For safety and approval purposes, you must not rebuild and/or modify this product. If you use
the product for purposes other than those described above, the product may be damaged.
In addition, improper use can cause hazards such as short circuiting, re, electric shock etc.
Read the instructions carefully and keep them. Make this product available to third parties only
together with its operating instructions.
This product complies with the statutory national and European requirements. All company
names and product names are trademarks of their respective owners. All rights reserved.
Delivery content
• Relay circuit board
• Operating instructions
Latest operating instructions
Download the latest operating instructions via the link www.conrad.com/downloads or scan the
QR code shown. Follow the instructions on the website.
Explanation of symbols
An exclamation mark in a triangle indicates important instructions in this operating
manual that absolutely have to be observed.
The arrow symbol indicates specic tips and advice on operation.
Safety instructions
Read the operating instructions carefully and especially observe the safety
information. If you do not follow the safety instructions and information
on proper handling in this manual, we assume no liability for any resulting
personal injury or damage to property. Such cases will invalidate the warranty/
guarantee.
• The device is not a toy. Keep it out of the reach of children and pets.
• Do not leave packaging material lying around carelessly. This may become
dangerous playing material for children.
• Protect the product from extreme temperatures, direct sunlight, strong jolts, high
humidity, moisture, ammable gases, vapours and solvents.
• Do not place the product under any mechanical stress.
• If it is no longer possible to operate the product safely, take it out of operation and
protect it from any accidental use. Safe operation can no longer be guaranteed
if the product:
- is visibly damaged,
- is no longer working properly,
- has been stored for extended periods in poor ambient conditions or
- has been subjected to any serious transport-related stresses.
• Please handle the product carefully. Jolts, impacts or a fall even from a low height
can damage the product.