6.2. Inputs
VAMP 121(D) has 10 arc sensor inputs X1:1-20, and one
connection for a portable arc sensor (VA 1 DP). All these inputs
have continuous self-supervision.
Furthermore, one binary input is available for blocking of the
output relay e.g. when testing the unit. The input can also be
configured to function as a resetting input (see chapter 1). The
blocking / resetting function is activated by connecting 24V dc to
the input X2:7 (-), X2:8 (+). The auxiliary voltage can be used. See
Figure 6.2-1.
When the blocking function is activated, the SF-alarm activates as
well.
Blocking function operation after trip:
When blocking function is activated, the latched trip output is
released. The LEDs of trip status and sensor channel activation
stay on until blocking function is deactivated. This means that
blocking function operates also as clearing function which returns
the device to normal operating status.
Figure 6.2-1. Binary input
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