5.10.2 Parallel control bus connection
In case of Parallel System, the communication between the units takes place through the Control Bus
Cables.
Each Parallel Unit contains the two boards “P13/P14 – IM0222 – Bus Interface Board” (mounted on top
of the board “P12 – IM0196 – RPA Board”) on which four connectors J1A - J2A and J1B - J2B are
allocated.
All the parallel units are connected to the same control bus.
This connection allows:
The microprocessors of each unit to communicate with each other.
The oscillators of each unit to be locked together.
The regulation loops to compare the output current of each unit in order to equally share the Load
current.
For increased reliability, this connection is made with redundant cables.
In this way, communication is maintained between units in case one of the control cables should fail or
be accidentally damaged or disconnected.
The standard length of the control bus cable between two parallel units is 12m / 40 ft.
The maximal overall length of bus connection, between the first and the last unit, should not exceed
90m / 295 ft.
Verify that control wiring run in an individual separate steel conduit.
NOTE !
Under no circumstance should the control bus cable connecting J1A - J2A (1/2/3/4/5)
and J1B - J2B (1/2/3/4/5) be connected or disconnected after the system has been
powered On.
It is important to place the units in sequence of their assigned number.
A unit number from 1 to 6 is defined by the setting of parameters and displayed on the panel (1 to 6).
This number is also marked inside and outside the packaging.
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