10 June 2015Enclosures, Racks, Cabinets & Panel Products
As part of its custom services offering, Verotec has supplied a major US-based defence contractor with custom design intelligent fan trays for a major defence project. The 19” rack-mounted 1U trays have six fans, located to maximise the cooling of critical elements of the electronic system located above the fan tray.
The key issues for the fan tray design were noise levels, current consumption and reliability. Verotec’s solution was a custom control board, which sequentially powers up each of the fans in order of importance to minimise the initial inrush current. The fans themselves are over-specified for the airflow required, enabling them to produce the required airflow when running at 70% of full speed, reducing noise and current consumption and extending mean time before failure (MTBF).
The maximum fan speed is user-controllable to support system deployment across different regions of the world; an embedded microprocessor controls fan speed using PWM technology. Reliability is critical, so three separate events will trigger a warning signal: if power is lost to the fan tray, if the controller board itself develops a fault, or if the speed of any fan falls below 20% of maximum. The fan cooling the main processor board is deemed to be a critical component, so if its speed falls below 20% the relay latches into the alarm position. If triggered by any of the other five fans, the alarm relay will re-energise when the speed increases above the 20% threshold.
An additional part of the custom design was the development of a custom input air ducting system that brings air in from the front of the rack into the bottom of the fan tray. A honeycomb grill provides EMC integrity and the removable air filter is mounted at an angle to maximise particle removal with minimal airflow restriction.
Transporting and storing lithium-ion batteries
Enclosures, Racks, Cabinets & Panel Products
Lithium-ion batteries have become ubiquitous in modern life, but along with their benefits comes a serious challenge: these batteries pose fire and safety risks and are classified as dangerous goods for transport.
Read more...Non-contact safety door switch Omron Electronics
Enclosures, Racks, Cabinets & Panel Products
OMRON has unveiled its latest innovation in non-contact safety door switches, the D40A-2, designed to enhance workplace safety and streamline machinery operations.
Read more...Easy installation panel mount assembly Future Electronics
Enclosures, Racks, Cabinets & Panel Products
NKK’s new easy installation Panel Mount Assembly (the BYB201-470) consists of a PCB, resistor, connector, and a straight PC adaptor.
Read more...Ultra-portable spectrum analyser Vepac Electronics
Test & Measurement
The PXN-400Z from Harogic is a handheld spectrum analyser covering a frequency range of 9 kHz to 40 GHz with a 100 MHz analysis bandwidth.
Read more...Versatile 3-in-1 instrument Vepac Electronics
Test & Measurement
The ARB Rider AWG-2000 is the cost-effective and powerful two or four channel arbitrary function generator and two or four channel arbitrary waveform generator with advanced sequencer functionality.
Read more...EEPROMs for industrial and military markets Vepac Electronics
DSP, Micros & Memory
Designed to ensure the data retention and the secure and safe boot of digital systems, the memory product line includes small and medium density EEPROMs from 16 kb to 1 Mb.
Read more...Multi-channel downconverter Vepac Electronics
Telecoms, Datacoms, Wireless, IoT
The Downconverter from Crane Aerospace is a converter that operates from 2 to 18 GHz and delivers a noise figure of 11 dB with an attenuation range of 25 dB.
Read more...Wi-Fi dongle supports 5 GHz band Vepac Electronics
Telecoms, Datacoms, Wireless, IoT
The Edimax IEW-7811UTC is a dual-band 802.11ac USB adapter with a USB 2.0 connectivity that enables network connectivity with high-speed rates of up to 433 Mbps.
Read more...The importance of contrast in fibre-optic sensing Vepac Electronics
Opto-Electronics
Contrast refers to the difference between the light signal that is transmitted through the fibre and the light signal that is received at the other end, and allows for the detection and measurement of small changes in physical parameters.
Read more...RF shield box to 12 GHz Vepac Electronics
Enclosures, Racks, Cabinets & Panel Products
The HDRF-1467-S from RF Electronics has a thick RF-absorbing foam that deadens standing waves and reflections to provide more than 100 dB of isolation.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version