VAMP Ltd
Arc protection system
Technical description
VAMP 221
VM221.EN013
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81
7.2.6.
Wiring multiple central units
A maximum of three central units can be connected to one
communication bus. In this case, the units can operate on a
maximum of four protection zones (depending on their
programming switches). The light and current signals given by
the I/O units, including address information, are transferred to
each central unit.
If more than one central unit is to be connected to the same
communication bus, one central unit must be in central unit
mode and the other central units in sub-unit mode
(programming switch SW1:8).
In applications with multiple central units the central units
can be interconnected also via BI/O connections (binary
input/output). In this case, each part of the system can control
four protection zones per system communication bus. In this
case, arc and overcurrent information is transferred between
the central units without address information.
NOTE!
When configurating arc protection system with multiple central
units, disconnect I/O-units from central units in slave mode
during their installation procedure.
The following BI/O connections are included in the standard
delivery:
La>in
X3-8
Arc input, tripping group 1
Lb>in
X3-9
Arc input, tripping group 1
Ib> in/out
X3-10
Overcurrent input/output
La> out
X3-11
Arc output, tripping group 1
Lb> out
X3-12
Arc output, tripping group 2
GND
X3-13, X3-14
Grounding for all BI/O signals
To obtain transfer of arc information between central units:
•
Connect the systems using the BI/O terminals X3-8, 9, 11
or 12 (+).
•
Connect the terminals X3-13 or 14 (GND).
To obtain transfer of overcurrent information between
central units:
•
Connect the systems using the BI/O terminals X3-10 (+).
•
Connect the terminals X3-13 or 14 (GND).
NOTE!
Note the polarity of the cables.
