LINK Systems 5100-8 Tonnage & Analog Signal Monitor - Manual (Page 76)

Doc #: L-802-1110 Page 74 Rev. 02
9 TROUBLESHOOTING
Most of the errors generated by the tonnage monitor are straightforward and are adequately covered in
sections 3.2.6 (Error Conditions) on page 24. However, some of these conditions are a little more
involved and bear further discussion.
Link is also happy to assist in diagnosis and troubleshooting of its equipment and can be reached at
(615) 833-4168.
9.1 Communication Errors
There are at least three error conditions that are related to communication errors:
Communication
Failure
This message is shown in the “Module Status” line at the bottom of the tonnage
monitor main screen when communications between the operator terminal and
the tonnage monitor have been lost for 2 or 3 seconds. This is typically because
the high speed bus cable has become disconnected from the operator terminal or
from the tonnage monitor. It would also appear if the tonnage monitor is not
powered.
CTM F. Comm. Fail This message is shown in the press control or brake monitor “Present Running
Status”. It may or may not appear in conjunction with “Communication
Failure” in the tonnage monitor screen. If this message occurs without
“Communication Failure” in the tonnage monitor screen, then it indicates a
short-term (as little as 80 milliseconds to as much as 3 seconds) loss of
communications. While a hardware failure in the tonnage monitor could cause
this, it is unlikely. More likely is an intermittent connection in the high speed
bus cable – possibly a loose wire in a connector, or a broken wire somewhere in
a cable section. Another condition that can cause this is a momentary power
failure in the tonnage monitor. If a power failure is causing this message, then
“Initializing” will appear for four or five seconds in the “Module Status” of the
tonnage monitor as it receives its settings on power-up.
No Resolver Info This message is shown in the “Module Status” line at the bottom of the tonnage
monitor main screen. The tonnage monitor receives crank angle from the press
control or brake monitor over the high speed bus cable at an extremely high
rate. Since sampling windows are determined by crank angle, the tonnage
monitor will generate this error if it does not receive a valid crank angle on a
timely basis. This can be caused by an extremely short-term loss of
communications (less than 7 milliseconds). It would also be generated if the
press control or brake monitor stopped sending crank angle out altogether
(power loss in the press control or brake monitor, or problem with the resolver
itself causing the press control or brake monitor to flag the angle as invalid).
While the above is a quick summary of the errors, the following subsections discuss step by step
troubleshooting procedures.