sparks
ELECTRICAL NEWS
august
2013
Motor control centres and motor protection
19
IFMelectronic’s newDA101S safe standstillmonitor
safety relay is designed for use inmachinery safety
control systems up to and includingPerformance
Level e (PLe) according to EN ISO13849-1 andSafety
Integrity Level (SIL) ClaimLimit 3 according to IEC
62061 (EN62061).
Equippedwith two volt-free safety relay outputs,
theDA101S has a slim25mmhousing and features a
solid-state PNP feedback output aswell as LEDstatus
indicators for the inputs andoutputs.Twooverlapping
input signals are compared andevaluated, ideally
from inductive sensors.These take their power directly
fromthe zero-speed relay.
As true zeromotion is difficult or impossible to
verify, theDA101S is in fact set by the user todetect a
low frequency, and switchwhen thedetectedpulse
ratedrops belowthepre-set value.Thiswill vary
according to thepick-up arrangement andmachine
constraints, soone of four frequencies (0.2, 0.5, 1 and
2Hz) canbe selectedusing a hard-wired link.This link
cannot be changedduringoperationwithout the unit
switching into the safe state.
TheDA101S is designed for panel-mountingon a
DIN rail, and requires a 24Vdc supply.
Enquiries: 0861IFMRSA(436772)
Standstill monitor
safety relay in 25mm
slim housing
ZESTWEG Group’s Genset Division is supplying a custom-en-
gineered genset solution to the Silo 1 building project in Cape
Town. The hybridmodern-meets-historic building comprises
nine storeys, three of which are basement levels.
In what is set to become a CapeTown landmark when
completed, the Silo 1 structure will provide 18 500m
2
of office
space, 300m
2
of retail space and 3 500m
2
of residential space
divided into 31 apartments. A six storey central atrium com-
pletes the picture.
The contract was awarded to ZestWEG Group’s Genset Divi-
sion based on the company’s submission of a commercial and
technical solution. The company is responsible for the design,
Powering up at CT’s Silo 1 building
Zest WEG Group’s Genset Division is supplying a custom engineered genset solution to the
Silo 1 building project in Cape Town.
assembly, installation and commissioning of
the gensets. The engines areTier 3 emission-
compliant, which is currently the highest level
for production engines.
“Because it was necessary to provide sound
attenuation to a residential level, the design
and engineering required the inclusion of
special inlet and outlet air attenuator splitter
assemblies. The exhaust systems are designed
andmanufactured in-house to ensure that
the exhaust breakout noise is within the
limitations of the local bylaws,”says Bruce
McCracken, fromZestWEG Group’s Genset
Division’s CapeTown offices.
McCracken points out that the company
will provide three 350kVA and two 500kVA
generator sets.“These units operate in parallel
as the load demand dictates. In addition, we
will supply one 500kVA genset as a stan-
dalone unit for emergency backup for the
residential complex situated on the existing Silo site which is
within the greater waterfront precinct.”
The contract was awarded in June 2012 and the gensets
arrived on site in the secondweek of May 2013.“The building
work is still in progress andwe anticipate that all functionality
testing will be conducted in July 2013,”says McCracken.
“As with any project we undertake, we enforce quality
standards based on our in-house programme of excellence.
This is carried out from the installation through to
commissioning, to ensure continuity in quality ,”
McCracken concludes.
Enquiries: (011) 723-6000
