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i-MARK Installation and Hardware Manual
5
Troubleshooting
5.1
General
This chapter covers how faults can be recognized and rectified. There are potentially four main
problem sources:
The user control system, including task requirements, communication cables, peripheral units
•
with possible object recognition switches.
The ILR system including peripheral units and their cables, also potential object recognition
•
switches.
The environment including large objects between antenna and tag, electrical disturbance sources,
•
human intervention, etc.
The quality of the technical design, including alignment between antenna, ratio of task
•
requirements/available communication time etc. The information about system performance is
contained in the relevant datasheets.
When planning the total system do not forget these problem sources and "Fault finding procedures on
system level" should possibly be included in the host system. How this could look in detail depends on
the relevant system concept and very likely varies from one system to another.
5.2
Status Display (LEDs)
LOOP
This LED lights green during sending a LF telegram (about 20 ms). In the case of a
loop error (loop broken or the set point of the loop current couldn't be reached) the
LED lights red when sending a LF telegram.
RUN
This LED blinks green, indicating the system is running normal.
BUS
Lights green during receive and orange during response – also for Bluetooth.
ERR
Blinking: system error on start-up, firmware execution failed.
5.3
Loop Error
There are three types of possible errors. Every of the following errors will switch the LOOP LED to red.
Also the marker will try to continue sending.
Loop broken
Loop current out of range
Loop shorten
Loop current is too low or near zero
When setting the loop current (power) the marker tries to control the
output signal in a way, that the preset current is measured during LF
transmission. This adjustment is only done once, if the loop current is
changed by the user. During normal operation the loop current is
observed every telegram. If then the loop current is ±20 % out of range
the error condition will set.
Page 19 of 22
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