Si30-408
Method of Troubleshooting
Troubleshooting
93
3.9
Diagnosis on Transmission System Malfunction
3.9.1 Understand Entire System (Make a Simple Illustration of the System.)
The key point of investigation on transmission malfunction shall be to understand and grasp
the system entirely.
Investigate how the connection wiring among devices has been conducted at site, and make
an illustrated drawing.
Thus, the cause of troubles and countermeasures can be found.
During test operation, or other step, equipment installation contractor may submit wiring
diagrams, etc. In many cases, however, wiring may be substantially changed due to various
restrictions of the site. Therefore, the initial wiring drawing shall be considered as a
reference. (Particularly, if different contractors for piping and wiring have contracted, such as
a large scale project, above problem can generally be caused.)
Although excessive man-hour for checking will be required, make sure to execute continuity
check yourself to grasp the equipment system correctly.
Grasping the actual system can suggest measures for improving incorrect branch wiring, or
for better location of DIII-NET expander adapters.
It is also valid measure to lay down a temporary wiring for investigation of trouble causes.
(Preparing some cables of VCTF 1.2 mm
2
with 100 m in length may be helpful.)
Make sure to keep the illustrated simple line wiring diagrams which is made at the end of the
latest service work showing the actual wiring. And the drawing can reduce man-hour for
reinvestigation and make response rapid when service call made in future.
(For discussion on transmission malfunction, the wiring diagrams can be helpful to shorten
the discussion time.)
[An example of illustration]
Installation of DIII-NET expander adaptor
PAC-1
PAC-4
PAC-5
PAC-2
PAC-3
U4 and U9 generated
Centralized controller
ON / OFF controller
Schedule timer
In the above figure, each line stands for;
Solid line: connection line of wiring which has been improved finally
Dotted line: Actually wired line (faulty wiring)
