SOLUTIONS 13 - Moeller Electric Parts

Operation
in Minneapolis
The situation:
Siyeza Creative Foods, LLC is a company based
in Minneapolis, USA, that produces all types of
pasta for deep frozen products. A Moeller
touch display-PLC (HMI-PLC) controls the
production machine. All signals are passed to
the HMI-PLC via a XI/ON remote I/O with a
Profibus gateway. Other Moeller components
include five frequency inverters as well as
RMQ control circuit devices.
The fault:
Normally the machine is switched on and
started up around 7.00 am every morning. The
screen, however, stayed dark several times,
and the touch display PLC only booted up
after the third or fourth power up attempted.
Even after the devices were replaced and the
Cable Train Operation
at Airport Toronto
The situation:
The new passenger transit system at Toronto
Airport in Canada links the new main terminal
MTB1 and terminal 3 with a parking lot
situated outside. Up to 2150 passengers can
be transferred in one hour in each direction.
The mass transit system consists of two railbased
shuttle trains that are driven via a wire
cable. The wire cable is driven continuously at
one point and run over the entire section,
similar to the principle used with a cable car.
The shuttles are rigidly connected to the wire
cable and do not have their own drive or
braking equipment. Acceleration, braking and
stopping are carried out exclusively via the
wire cable. All Cable Liner Shuttles are fully
automated and do not require a driver or
escort personnel. The 1.5 km long section
between the end stations is covered by the
shuttles in 3.5 minutes.
power supply checked, the same problem
occurred every morning.
At 6.15 am in the morning the Moeller Field
Service once more confirmed the fault
described. The tracing of the power supply
and the Profibus signals did not produce any
more findings as to the cause of the fault.
Initial suspicions arose after asking employees
when and how the equipment was cleaned.
Answer: An intensive high-pressure cleaning
of factory hall floors, walls and all machines
was carried out every night after production
had ended.
The cause:
The next day, another test was carried out at
5.15 am. It was then that the cause was
found. The inside of the control cabinet doors
showed considerable signs of wetness and the
devices were consequently soaked in moisture.
The humidity on the PCBs caused creepage
currents that produced the undefined device
behaviour. In short, the touch display PLC was
being operated outside of the specifications.
SOLUTIONS13
The Cable Liner Shuttle technology from DDC
(Doppelmayr Cable Car, Wolfurt, Austria) is
designed for harsh climatic conditions. Thanks
to the wire cable drive system, snow and ice
have no effect on the traction between the
wheel and the rail. This concept also stands
out on account of its very low noise, without
any rotating wheels.
The operation:
The power supply for this shuttle is
implemented with Moeller NZM circuitbreakers.
UL approval, a high switching
capacity and total reliability were the principal
reasons why these devices were chosen. The
Moeller Field Service commissioned the
system together with a local panel builder
after the cable train had been assembled and
installed. This was because of the tight time
schedule involved. It took only one day to
install the NZM2 circuit-breakers and carry out
all the necessary settings. The cable train now
operates as if driven by a ghost, and even a
hotel close to the railway does not experience
any disturbance.
Solution – astonishingly simple:
The Moeller Field Service recommended that
the customer used a control cabinet with
protection to IP 66 which should not be
positioned directly at the machine.
MS1313
For Moeller Electric Sales and Support call KMparts.com (866) 595-9616
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