Cattron CT24 Series, Руководство пользователя

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CT24 MCU
User Manual
52
9M02-7608-A001-EN
Version 2.0
7.9 TDMA
TDMA is an optional feature that allows many systems to operate on the same frequency, either to minimize the
number of RF licenses required on a large site or to make it possible to implement a system that requires many
OCUs to be on the same frequency at the same time.
It is possible to have MCUs use both TDMA and frequency scanning when implementing a large or complex
system comprising many MCUs.
As more TDMA slots allocate to a frequency, the system response to a switch change becomes slower, so a
balance between allocated TDMA slots and required response is required.
7.10 Frequency Scanning
Frequency Scanning is an optional feature that allows one MCU to scan multiple frequencies (the current limit is
12). This feature allows one MCU to operate from any one out of many different OCUs transmitting on different
frequencies.
Frequency scanning may be combined with TDMA, and MAC or SAC.
This feature is likely to be used where TDMA is not needed, or where the number of OCUs on air exceeds the
TDMA allocation per frequency.
This feature is available on all MCUs.
For example, an MCU running frequency scanning of eight frequencies, each running with OCUs running TDMA
with seven slots, could seek and lock onto a valid address from 56 (= 8 X 7) OCUs.
7.11 SymmetryLock
™
Tandem operation is required when lifting large and heavy objects that are too large for a single crane; the wing of
an aircraft or the carriage of a rail car are both good examples. If the cranes being used do not move together in
symmetry, there is a risk of the load being dropped with consequential damaging to the load, surrounding
equipment and personnel.
Traditionally, tandem crane operations have required additional systems to be fitted to form a safety interlock
between the cranes involved. This requires additional hardware, installation and maintenance, all adding to cost
and complexity.
SymmetryLock
™
protects multiple cranes being used in tandem by a single remote control operator.
SymmetryLock™ is integrated into the remote control system and utilizes multi crane wireless feedback loops to
ensure that all cranes continue to move in unison; this means that no additional hardware or set-up is required.
SymmetryLock
™
is able to interlock typical dual, triple or quadruple crane installations as well as dynamically
changing travelling hoist/bridge combinations. It continuously maintains the interlocking with no additional user
intervention required. This is fast and efficient and keeps the operation safe from RF communication or crane
drive faults that might cause an unsynchronized lift.
SymmetryLock
™ meets the required parts of stringent European safety standards such as EN ISO13849 PLd, EN
ISO 60204-32 and EN15011, and exceeds the safety standards in many other regions.
Being able to prevent potential load drops provides many additional opportunities to protect equipment and
personnel in almost any plant with tandem lifting operation.