Surge Protection; Vital Inputs; Figure 2-6 Emi Filter Installation (Showing Wire Loops); Figure 2-7 Emi Filter Installed - Siemens VIU-20 Installation And Instruction

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Step 3: Wrap the long end of the cable around the outer surface of the filter and back through
the center of the filter one time (totaling two wire runs inside the filter – see Figure 2-6.

Figure 2-6 EMI Filter Installation (showing wire loops)

Step 4: Snap the filter closed (see Figure 2-7).

2.1.4 Surge Protection

The VIU unit provides internal secondary surge protection circuits on all vital inputs. Primary
surge protection is required for power, track, and other input/output connections.

2.1.5 Vital Inputs

The VIU top panel provides four male, 10-pin, cage-clamp style connectors that provide a total
of 20 discrete transmit, receive, vital input, vital output, or vital lamp pairs that can be monitored
by the VIU (five pairs on each connector). The wires are connected to mating female 10-pin
connectors (supplied with the unit) which are then plugged into the appropriate connector on the
VIU top panel.
SIG-00-07-11
Version No.: B.2

Figure 2-7 EMI Filter Installed

SIEMENS STRONGLY RECOMMENDS INSTALLING PRIMARY
SURGE PROTECTION ON EXTERNAL LINES CONNECTING TO
THE VIU.
CAUTION
2-5
SEPTEMBER 2012 (REVISED OCTOBER 2019)
INSTALLATION