There’s more than meets the eye to Weidmuller’s Powermate range
The Weidmüller Powermate range places an innovative choice of high-performance connectors at the disposal of the development engineer. All the relevant standards applicable to plug-in connectors are taken into account, as are the customary product standards that the engineer must fulfil for his application to be approved, for example DIN EN 61800 or UL 508C. As well as excellent performance, the range delivers maximum reliability and the greatest possible freedom for implementing solutions and fit-for-purpose design. The construction and performance classes
of frequency inverters are determined to a large degree by the connection technology that is to be utilised. In principal, the different interfaces can be reduced to four basic applications: » Power supply: conductor to PCB with finger- safe field connection.
» Module assembly: PCP to PCB with finger-safe socket block.
» Motor feeder or brake: PCB to conductor with finger-safe PCB connection.
» On-the-fly connection: conductor to conductor with finger-safe socket side.
It is in these applications that the Powermate range demonstrates its capabilities to the full, ensuring the right connection technique is available to meet the needs of the respective application:
» For the application conductor/PCB, the finger- safe socket-block BVZ/BUZ is utilised for the conductor connection, in other words, the hot end – with the SV/SU type pin header as a counterpart on the PCB.
» For the application PCB/PCB, pin headers of the type SV/SU are used for the PCB connection with the finger-safe BVL/BUL type socket block utilised on the other PCB.
» The third application PCB/conductor sees the finger-safe socket blocks of the type BVL/BUL demonstrate their merits on the PCB side. The user completes the conductor connection with the pin header type SVZ/SUZ.
» Last but not least: the fourth application – conductor/conductor. The pin headers SVZ/ SUZ are sited at the cold ‘dead’ end, with the finger-safe socket block BVZ/BUZ put to use at the hot ‘live’ end.
The performance scale ranges from 500 V/41 A through to 1000V/76 A. The four performance classes ensure the right performance is available to meet the needs of each application. That means device series with several performance ratings can be equipped throughout with a uniform system.
Other features ensure that the product continues to function for decades, as intended:
» ’Steel for strength and copper for current’ is the principle behind Weidmüller’s clamping yoke connection technology. Together with a low contact resistance, even when subjected to temperature fluctuations, this achieves totally maintenance-free functionality over its entire lifetime. Responsible for this is the principle of self-locking. When tightening the screw both clamps generate a durable counter-locking force.
» Four-point sprung tulip contacts made of steel ensure a constant high-level contact pressure. Silver-plated surfaces ensure the lowest- possible voltage drop and temperature rise characteristics.
» An additional fixing option in the flanges provides strain relief for soldered connections and prevents failures resulting from mechanical stress.
The safety-orientated design of the range prevents critical operating failures and minimises the risk of injury to personnel and damage to property.
» The fail-safe mating face prevents both pole reversal and misalignment when the connectors are being plugged. For example, it is impossible to plug two 2-pole connectors in a 4-pole terminal strip. Additional coding channels allow six coding variations with 2-pole connectors which prevents confusing connectors with the same number of poles.
» Inverted versions allow finger-safe functionality at the ‘hot end’. That applies to both on-the-fly and PCB connections.
» The multifunction locking mechanism visibly indicates the interlocking status. It guarantees that the connection remains strong in the face of vibration or inadvertent tugging.
12 focus magazine - issue 9
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