R.V.R. Elettronica SCM6/1, User Manual, Page: 35 / 48

SCM6/1
ELETTRONICA
29
/ 40 User Manual
Rev. 2.0 - 29/11/22
When it’s safe to move the cohaxial relay, SCM6/1 sends the corresponding TC and
waits for the acknowledge of the fact that the relay reached the wanted position.
To allow for possible delays or misfunctionments in the actuation of the preceding
two steps, a wait-retry mechanism is foreseen including 4 attempts separated by
a configurable delay (this timer is called “after” in the wait menu).
If everything went as requested, at the end of the permutation the transmitter that
has been put on load is switched using the relevant Telecontrol.
In case of “reverse” permutation, the software will then pass to the “Power Fault
detection” process for transmitter TXi, that is the one that caused the reverse
permutation for transmitter TXj (with lower priority) that was on load.
If the commands given by the SCM6/1 don’t have the required effect (the power
of a transmitter is not cut, or the relays doesn’t switch to the requested position),
the system implements a mechanism of fault management consisting in locally
setting the involved transmitter as disabled. This is intended to avoid hanging
in trying to serve a transmitter that is not controllable anymore, and living to the
automatism the possibility to manage possible faults of other transmitters. It’s the
case to remember that in such case the system will not be in “Nominal” status
anymore, and such condition will be denoted by the “Nominal” led on the front
panel being off.
6.3 Operation in manual mode
When the SCM6/1 is set in manual mode with the switch on the front panel, the
automatism in the machine is disabled.
The manual staus is remotely signalled to the frontal with the TS “N+1 Local”.
When in this mode, it is possible send TC, receive TS or configure the system
being shure that the SCM6/1 will not interfere with the operations performed.
The SCM6/1 assists the operator also in manual mode, giving to the devices of
the system the suitable commands to obtain the desired results.
In particular, if the user requests a permutation (from the transmitters configuration
menu, item “Air/Load”), the SCM6/1 acts exactly as described in the “Permutation”
process in the automatic mode.
As noted in chapter 4.2.4, when the permutation is direct (Position 1 to Position 2),
TXr is switched ON, while TXi is switched OFF. For a reverse permutation (Position
2 to Position 1), TXr is switched OFF, while TXi is put on air, but the On TC is not
given, so it’s left in the status it was before the permutation. If it was OFF, it is thus
necessary to explicitly turn it ON from the configuration menu.