Page 223 - Elpress英文样本电气连接压接系统

Bolt joints Service and maintenance

Bolt joints Selection of washers: Service and maintenance
• Always select hard flat washers of the
Users/installers of bolted connectors BRB, HB200 type. Our service department maintains,
always have to adhere to, and follow • The tension washer can normally be repairs, checks, calibrates and certifies
electrical codes and norms in the local excluded. If a tension washer of type DIN Elpress tools and power sources.
region where they are making such instal- 6796 is used, it must be placed between Following a review of the equipment by
lations. The information below is general the screw head/nut and the flat washer. It the service department, certificates are
and hence, should never be seen as an must never be placed issued that verify the performance of
installation instruction. The installation directly against an electrical the tools. To ensure that your crimped
of a terminal with bolt joint for electrical contact surface without a flat washer in terminals maintain a high and even level
transmission requires special attention. It Bolt joint with spring washer. between. The flat washer must have an of quality, regular checks shall be done of
is important that this is done in a correct external diameter at least as large as the
manner, as important as the contact Mounting the terminal against tension washer. the crimping tools.
crimping at the other end of the terminal the connection rail • 1 spring washer is sufficient and it should We offer:
as described above. The joint must achieve be placed on the rear of the • Contract preventive maintenance,
a sufficiently high clamping force, distribu- Max. 2 terminals of the same size on busbar, between nut and hard flat Elpress Basic and Elpress Advance
ted in a desirable manner and ensure the the same screw. Current load should be washer, see diagram. • Calibration of tools
electrical properties over a very long time checked. Installation: • Repairs (servicing of tools)
under high and varying loads of different • The screws must be tightened with tor- • Rental of crimping equipment
characteristics. It is very important to fol- Preparatory: que tools so that tightening is
low the installation instructions. These are • Clean contact surfaces from dirt, oxide controlled.
based on theoretical calculations, verified layers and grease using a steel brush and • Torque wrenches must be calibrated
tests and experience from field studies. denatured alcohol. This is especially im- regularly. Oil the screw when installing.
Tightening must be carried out in a con- portant for aluminium. Surfaces that are Even if the torque is recorded correctly,
trolled manner using torque tools, where tinned, nickel-plated, silver plated must the pre-tension force depends entirely on
the relevant screw is tensioned to the not be brushed. the friction.
specified torque. The accuracy of the tool • Petroleum jelly or contact grease reduces • Tightening torque according to the table
is of great importance. The clamping force corrosion risk on cleaned surfaces above. Accuracy better than ±5%.
of a properly tightened screw shall create a • The terminal palm and busbar may be of Elpress Basic Rental of contact crimping
contact area large enough to ensure good Fastener selection: different materials. This forms the basis of a service agre- equipment
conductivity, without the risk of overhea- • Screws and nuts of strength class 8.8. ement and includes the following points:
ting. In order for the clamping force to be • Greased galvanized screws provide the Al/Al gives a weaker joint. It is important to • General inspection of the tool Sometimes the accumulation of work
distributed evenly and create a sufficiently least dispersion of the pre-tension force. clean and use contact grease. Tension was- • Safety aspects according to declaration can be greater than can be expected,
large contact area, hard flat washers must • Choose stainless A4-80 in environments her + flat washer can reduce the risk of conformity (compliance with the or individual projects may require more
always be used, type BRB HB200 SMS 70, when there is a high risk of corrosion. of settlement. resources than usual and then it is
under screw head and nut. See image Al/Cu gives a higher risk of corrosion Machinery Safety Directive, Low Voltage possible to rent equipment at Elpress.
below. This applies regardless of the hard- and settlement, use contact grease. Directive, EMC Directive). When repairing equipment for a
ness of the conductive materials (which Cu/Al provides low risk of galvanic • Function test company, Elpress can rent tools to the
are softer than HB200). Otherwise, there is corrosion when the rail is made of Al. • Checking of accessories, e.g. crimp dies company if required, until the original
risk of large deformation of the conducting Cu/CU provides the best joint, good etc.
material that reduces the tension, which contact and small risk of settlement. • Issue of Certificate equipment is repaired and returned.
can increase the risk of inadequate contact • The inspection follows Elpress final
area and overheating. Purchased a new product?
inspection and acceptance inspection

Preventive maintenance requirements. Send the Product registration form to
Elpress and Elpress Basic is included for
Elpress service offers a flexible service Elpress Advance free the first year.
solution for increased security with fast
Recommended tightening torque Elpress Advance includes:
service and high availability. • Elpress Basic + corrective maintenance
Our service agreements are available in 2
Steel Steel Steel Steel Steel Steel Includes calibration with certification
Thread Stainless * Stainless *Stainless * levels, Elpress Basic and Elpress Advance.
8.8 * 8.8 * 8.8 * 10.9 * 10.9 * 10.9 * and consumables repairs at a fixed
To sign a service agreement with Elpress
Bolt joints. - Mv Ff p Mv Ff p Mv Ff P price.
M5 5,5 6,6 118,0 8,0 9,2 164,0 5,5 6,2 111,0 means the following:
Tension washers M6 9,5 9,2 114,0 13,0 13,0 160,0 9,5 8,6 107,0 • Planned and preventive maintenance
The use of different types of locking M8 23,0 17,0 116,0 32,0 24,0 164,0 22,0 16,0 109,0 ensures better performance for your
elements or spring washers often M10 45,0 27,0 92,0 64,0 38,0 129,0 45,0 25,5 88,0 equipment.
increases the risk of settlement. If a M12 78,0 40,0 125,0 110,0 56,0 175,0 76,0 37,0 116,0 • Regular service intervals minimise the
spring washer of type DIN 6796, M16 200,0 75,0 156,0 280,0 110,0 229,0 185,0 69,0 144,0 risk of unforeseen stoppages by indi- 12
with a very high clamping force, is cating any safety or functional defects Information
positioned and secured between e.g. Mv = tightening torque (Nm) and recommending measures to avoid More information is available from the
nut and the hard flat washer, it can Ff = pre-tensioning force (kN)
provide an increased margin towards p = flat pressure (N/mm²) these problems service department:
excessively high settlement. FZB = electroplated + gloss chromed • Regular service intervals are normally https://www.elpress.net/en/products/
The diameter of the tension washer FZY = electroplated + hard chromed implemented every 12 months for a Calibration with certification of system-elpress/service/
should be less than or equal to the flat FZM = FZM= mechanically galvanized fixed price
washer’s, even after tightening fully. * (FZB, FZY, FZM) • The price is based on the service level tool
Otherwise, the risk of settlement at the A4/80 and tool equipment. Calibration follows the same points and
outer edge of the flat washer increases • A certificate is issued after the equip- requirements as Elpress Basic, but it is
where the clamping forces are concen- ment has complied with calibration the customer’s responsibility to submit
trated. When using spring washers, 1 is
sufficient and it is preferably placed on requirements the tool for calibration.
the opposite side of the terminal. • Calibration can also be done on-site at
the customer

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