F 6705 (0524)
335
2 Current connections
2.1 Redundant current connection
Figure 3: Redundant current connection
With redundant current connection, the following must be considered:
– The total current I
G1
resp. I
G2
to the burden R
B
is the addition of the individual currents I
11
and I
21
resp. I
12
and I
22
.
– The admissible burden resistance is half the value.
– The paralleled channels have to be used in the same mode (source or sink mode).
– Because of the temperature error and of the wanted well-balanced load of the modules
each output channel should generate the half of the current I
G
to the burden.
Note If one of the two redundant modules is switched off caused by an error,
only half the current is delivered at the output (from
one module), in
the worst case for a maximum of two cycles.
With the connection of a replaced module twice the current may be
delivered for a maximum of one cycle.
Z 7126/6705/C../R2 Z 7126/6705/C2/R1
Channels 1: Sink mode
Channels 2: Source mode
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