3. Wiring
3.1. Wiring and fiber-optic cable connection
The terminals for the electrical and fiber-optic cables are located under the bottom cover of the display
unit. The layout of the KB measuring board is shown in fig. 3.1.
Red/IR
Green
Blue
RS-485 Binary inputs
Break out
Alarm out
Shield
Analog outputs
A B
OPTIC Cable
OPTIC Cable
Shield
Shield
Shield
On
On
Off
Off
Com
Com
- +
- + - +
Fig. 3.1. KB Measuring Board layout.
Relays are of dry contact types. In normal operation the "Break Out On" relay is open and it closes
during a break. In case the power is lost or turned off the "Break Out On" relay remains open (dis-
abled). "Break Out Off" works in the opposite way.
"Alarm Out Off" is normally closed. It opens in case the built-in self-diagnostics detects a failure. If
power is lost or turned off the "Alarm Out Off" is OPEN. "Alarm Out On" works in the opposite
way.
Break Out
Shield
Shield
On
On
Off
Off
Com
Com
Alarm Out
FUSE
Fig. 3.2. Wiring of Power Supply, Break relay and Maintenance alarm.
KB² Man W41100099V1.210August 2012
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