Diagnosing The Location Of Fault(S) Using Commissioning Process - Baldwin Boxall OmniCare Installation Manual

C O M M U N I C A T I O N S
6.2.4 Diagnosing the Location of Fault(s) using
OmniCare issue 1
• If the output voltage is less than 22V DC, then check that
length of +V cable for short circuits, shorts to earth etc.
• If the output voltage is greater than 22V DC then there
is an open circuit fault in the +V cable between the two
Remote Units.
Commissioning Process
If the 0V and Power Continuity checks are both OK then the next
step is to reverse the loop and connect the "B" cables to the "A"
termination point. This will indicate how far down the loop the
fault(s) are located.
1. Run the Commissioning Process to locate the failure point
nearest to the "A" end of the cable.
C
A U T I O N
Ensure Mains Power is disconnected before connecting or
disconnecting Loop Circuits.
2. Disconnect the "A" end of the cable from the control panel.
3. Connect the "B" end of the cable to the "A" termination on
the control panel.
4. Run the Commissioning Process again to locate the failure
point nearest to the "B" end of the cable.
The following Examples shown in Figure 6.4 - Figure 6.7
illustrate the progress of the Commissioning Code along the loop.
In the First examples (Figure 6.4 & Figure 6.5) a single Remote
Unit has failed, so limiting the progress of the code to that
location.
In the Second set of examples (Figure 6.6 & Figure 6.7) there are
two separate faults that prevent a series of Remote Units from
operating.
In both examples, by reversing the loop and connecting the "B"
cable to the "A" termination the location of the fault(s) can be
more easily determined.
OmniCare EVC System
Installation & Commissioning Manual
75