New Danfoss VLT® Decentral Drive E cient, reliable and powerful
New Danfoss VLT® Decentral Drive E cient, reliable and powerful
New Danfoss VLT® Decentral Drive E cient, reliable and powerful
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ELECTRICAL<br />
Multi-pump soft-starter<br />
h<strong>and</strong>les pumps from 1–15kW<br />
Ralspeed has announced a<br />
multi-pump soft-starter for<br />
controlling <strong>and</strong> protecting<br />
pumps from 1–15kW, thus<br />
avoiding the need to use<br />
different soft-starters for each<br />
size of pump. The system is<br />
based on an overload protection<br />
relay that can be set to match the pump in use via a rotary<br />
switch calibrated in kW – no other settings are needed.<br />
A digital display shows the kW rating selected, the<br />
instantaneous running current <strong>and</strong> the status of the softstarter.<br />
It can also show data from the last eight trips,<br />
enabling problems to be diagnosed rapidly. The soft-starters<br />
are equipped with a load-break isolator, a h<strong>and</strong>/auto<br />
selector switch, a door-mounted e-stop pushbutton, <strong>and</strong> an<br />
analogue output proportional to the motor current. The<br />
overload relay provides earth leakage protection <strong>and</strong> can be<br />
used with thermistors to monitor motor temperatures.<br />
Ralspeed 01254 582345 www.ralspeed.com<br />
Light curtains have 14ms response<br />
Panasonic has introduced a slim safety light curtain which it<br />
describes as one of the smallest on the market. The IP67-<br />
protected SUNX SF4B Type 4 light curtain offers 10, 20 or<br />
40mm beam pitches <strong>and</strong> comes in three versions – for<br />
finger, h<strong>and</strong> <strong>and</strong> arm, or foot protection. All types can be<br />
wired to provide NPN or PNP transistor outputs.<br />
The curtains offer a 14ms response time, regardless of the<br />
number of channels, the beam axis pitch, or the number of<br />
curtains connected in series. The rapid response time,<br />
coupled with the small beam pitch of the finger protection<br />
version, allows the light curtain to be installed closer to<br />
danger points than conventional models. The body <strong>and</strong> the<br />
cylindrical inner casing that protect the electronics ensure<br />
that the curtains conform to IP65 <strong>and</strong> IP67. An easy-to-read<br />
digital error indicator makes troubleshooting easy.<br />
Panasonic Electric Works UK<br />
01908 231555 www.panasonic-electric-works.co.uk<br />
Solid-state relays are ‘smallest’<br />
Carlo Gavazzi claims to be offering the first UL-certified<br />
solid-state relay <strong>and</strong> contactor combinations in a 17.5mmwide<br />
format. The RG series SSRs include panel-mounting<br />
versions rated up to 600V AC <strong>and</strong> 90A AC, <strong>and</strong> versions<br />
with integrated heatsinks that can h<strong>and</strong>le 20A AC in<br />
17.5mm widths <strong>and</strong> 30A AC in 22.5mm widths.<br />
With a 100kA short-circuit capability, the relays are<br />
suitable for silent switching of motors <strong>and</strong> will resist up to<br />
5g of vibration. DC versions can be controlled by 4–32V<br />
DC, while AC versions can be controlled by 20–275V AC or<br />
24–190V DC. There is a choice of zero-crossing or instanton<br />
(r<strong>and</strong>om) mains voltage switching. Over-voltage<br />
protection is provided across the output. A removable IP20<br />
cover allows power terminals to accept ferrule, ring <strong>and</strong><br />
fork type terminations. Control status is indicated by LEDs.<br />
Carlo Gavazzi UK 01252 339600 www.carlogavazzi.co.uk<br />
FLUID POWER<br />
Stainless-steel cylinders<br />
resist washdowns<br />
SMC has developed <strong>and</strong><br />
improved several<br />
stainless-steel pneumatic<br />
products for wet <strong>and</strong><br />
washdown applications.<br />
For example, its<br />
portfolio now includes<br />
the CJ5-S <strong>and</strong> CG5-S airoperated<br />
cylinders for<br />
food-processing<br />
machinery where<br />
corrosion <strong>and</strong> heat<br />
resistance are often essential. The cylinders, in bore sizes<br />
from 10–100mm, have an all-stainless steel external<br />
construction <strong>and</strong> are fitted with a scraper to prevent water<br />
from entering the cylinder.<br />
There are also two improved stainless-steel fittings ranges –<br />
KQG2 <strong>and</strong> KFG2. The KQG2 one-touch fittings, based on the<br />
earlier KQG series, are about 30% smaller <strong>and</strong> more than<br />
60% lighter than conventional models <strong>and</strong> come in 17<br />
versions designed to operate with fluids from -5ºC to 150ºC.<br />
The insert fitting type series KFG2, which operates with fluid<br />
temperature from -65ºC to 260ºC, is more than 40% smaller<br />
<strong>and</strong> nearly 40% lighter than conventional models.<br />
SMC is also offering a stainless-steel speed controller<br />
(series ASG) with one-touch fittings for ambient operating<br />
fluids from -5ºC to 60ºC, <strong>and</strong> operating pressures from 0.1–<br />
1MPa.<br />
SMC Pneumatics (UK)<br />
01908 555017 www.smcpneumatics.co.uk<br />
Linear drives combine power,<br />
accuracy <strong>and</strong> flexibility<br />
Parker Hannifin’s Parker-<br />
Origa division has<br />
launched a range of<br />
magnetically-coupled<br />
pneumatic rodless<br />
cylinders with a single<br />
rod <strong>and</strong> rotating carriage,<br />
or with integrated anti-rotating guides. The P1Z linear drives,<br />
which consist of a stainless-steel pneumatic cylinder body fixed<br />
between two end-plates, can be used at low speeds from<br />
0.05m/s <strong>and</strong> can deliver thrust forces up to 942N.<br />
A hard anodised aluminium carriage is fitted to the<br />
outside of the cylinder body, with the carriage <strong>and</strong> the<br />
cylinder piston coupled magnetically using annular<br />
magnets. In the unguided version, the carriage can rotate<br />
through 360 degrees around the cylinder, with adjustable<br />
pneumatic end-of-stroke cushioning <strong>and</strong> air ports at both<br />
stroke ends. The guided version uses two rigid chromeplated<br />
steel guide rails, with optional magnetic sensors for<br />
precise positioning. They can be fitted with elastomeric<br />
bumpers for light loads or hydraulic shock absorbers for<br />
heavier loads. Both versions can be mounted horizontally or<br />
vertically <strong>and</strong> are available in bore sizes from 16–40mm <strong>and</strong><br />
in stroke lengths up to 2m.<br />
Parker Hannifin 00800 27 27 5374<br />
56 November/December 2010 www.drives.co.uk