mDT001 HazMon System Tester Technical Manual /25
CMC INDUSTRIAL ELECTRONICS LTD
Phone: (604) 421-4425 Toll Free: (888) 421-4425 Fax: (604) 421-7734
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The Industry Leader in HazMon Technology
5. Troubleshooting charts
NO
NO
See "Troubleshooting
the Bus Converter RS-
485 Network"
YES
NO
YES
Is the "Faulted"
sensor plugged into in
this FIB?
YES
YES
NO
Locate the FIB where the
sensor is connected
NO
One or more sensors in
"Fault"
or not reading correctly
Check the "Status"
screen on the
EZSentinel128
or
WS1 Webserver
Are all installed bus
converters online?
Locate the first
bus converter with
faulted sensors
Are errors indicated?
Locate first Field
Interconnect Enclosure
(FIB)
Are both
the red and green
LEDs on in this FIB?
See chart above for error
codes
YES
Unplug and clean the
sensor connector with
99%+ isopropyl alcohol
on both the plug and jack
Is the sensor now
working correctly?
Replace sensor
and assign the new
serial number in WS1 or
EZ128
Error Codes
Bus Converter
WS1 Webserver EZSentinel128
Red LED
Green LED CAT5 Cable
Sensor Cable
Online
Online green
1 sec on/1 sec off
On
Bus converter OK
Offline
Online red
n/a
Off
See "Troubleshooting the RS-485 Netwrok"
Bus Low
Data shorted low
3
n/a
Blue shorted to any white
Green shorted to white or black
Bus High
Data Shorted High
4
n/a
Blue shorted to green, orange or brown
Green shorted to red
Bus overload
Bus power overload
1
n/a
Green, orange or brown shorted to any white
Red shorted to white or black
No sensors
No sensor on bus
2
n/a
Blue open or disconnect switches off
Green open or sensor unplugged
Other faults
Sensor reads 85C or 185F
Green, orange and brown open
Red open
FAQ’s
•
What is the most common cause of “Faults”?
o
Water ingress into the wiring or FIB’s is the most
common cause of “Faults”.
•
Why are all
the sensors on a bus converter “Faulted”?
o
All of the sensors on a CMC Intrinsically Safe network
are wired in parallel. A short circuit on one sensor can
short the bus and “Fault” all of the sensors.
•
All of the sensors on a single bus converter are indicating
intermittent “Faults” every once in a while?
o
The bus may have a partial short circuit. Partial short
circuits can occur after severe electrical storms or due
to water ingress in the wiring. Follow the procedure in
the flowchart but instead of observing
the LED’s,
observe the voltage on the blue/white and green/white
pairs. Both pairs should have 4-5VDC present, with the
negative lead on the white wire and the positive lead on
the colored wire.
o
You can make a test cable from an old sensor. Join the
white and black wires together and measure between
the white/black wires and the green (data) and red
(power) wires. The test cable can be plugged into a
spare jack in the FIB for testing.
o
As indicated in the flow chart, start at the first FIB after
the bus converter and work outwards. If the voltages
return to normal when the outbound cable(s) is
disconnected using the disconnect switches, then the
partial short is further down the network. If the voltages
do not return to normal, disconnect the sensors one a
time to locate the partial short.
•
A sensor reads +85
o
C or +185
o
F, what is wrong?
o
The red wire in the sensor cable is open. Unplug the
sensor and clean both the plug and jack with 99%
Isopropyl Alcohol. Replace the
sensor if the
problem is not resolved.