Table of Contents
Advertisement
4.
Verify that there are no other devices that may drop an excessive voltage across them in the
power supply circuit (to the analyzer) like a fuse, diode or a barrier device, etc. Correct and
retest as necessary.
5.
Disconnect the power supply cable at the analyzer termination panel J1.
6.
Measure the power supply cable voltage at the connector and compare with the
recommendations (see
7.
If the power supply voltage does not meet recommendations, check the cabling and other loads
on the power supply. Also check the power supply output voltage setting. Correct and retest as
necessary.
8.
Reconnect the power supply cable to the analyzer termination panel J1.
11.4.3
Equipment isolation test
This test isolates the peripheral equipment to verify that excessive current is not being drawn from
the power source, thus reducing the amount of power supplied to the analyzer.
This procedure assumes that the previous power supply voltage test was performed and that no errors
were found.
To isolate equipment issues:
1.
While the analyzer is operating, verify that the voltage at the analyzer termination panel is
between 11.5 VDC-16 VDC (for 12 VDC systems) or between 22 VDC-28 VDC (for 24 VDC
systems).
The analyzer uses pulse width modulation technology to drive its heaters and valves. Due to this
feature, a DMM may not show the voltage present at the analyzer termination panel accurately.
However, in no case (even under load), should the DMM indicate a voltage less than 11.5 VDC (or 22
VDC for 24 VDC system) if the proper cables are used. It may be necessary to have a digital voltmeter
capable of capturing fast transients (less than 1 ms in duration).
For example: While using a DMM with fast transient capture capability, set the DMM to capture the
minimum voltage (sometimes this is a min/max measurement). Then let it monitor the analyzer while
operating for a few minutes. This should provide a good indication of the minimum voltage appearing
at the analyzer terminals.
2.
Is the voltage within limits? If not, continue to the next step. If yes, then no physical problem
is found.
3.
Is the external equipment, such as a radio or other device, being powered from the analyzer
termination panel? If not, continue the test sequence. If yes, continue to the next step.
4.
Disconnect the peripheral equipment from the analyzer.
5.
While the analyzer is operating, verify that the voltage at the analyzer termination panel is
between 11.5 VDC-16 VDC (for 12 VDC systems) or 22 VDC-28 VDC (for 24 VDC systems).
6.
Is the voltage within limits? If not, continue the test sequence. If yes, the external equipment
is drawing excessive current. Check the equipment and related wiring. Correct and retest, if
necessary.
11.4.4
Analyzer module isolation test
This test isolates the analyzer modules to pinpoint equipment failure.
This procedure assumes that the previous power supply voltage test and equipment isolation test
were performed and that no errors were found.
To test the analyzer module:
1.
With power still supplied to the termination panel J1 connector, disconnect the power supply
cable at the termination panel.
2.
Using instructions in section
panel to the digital controller cable.
3.
Using instructions in section 10.16, remove the analytical module.
4.
With power still disconnected from the analyzer, measure the voltage at the J1 connector screw
terminals. Record the value as power supply voltage (open circuit).
5.
Reconnect the power supply cable at the analyzer termination panel J1.
6.
Measure voltage at the termination panel J1 connector screw terminals. Voltage should be
within 0.1 VDC of the power supply voltage (open circuit).
7.
If the voltage drop is greater than 0.1 V, replace the termination panel using instructions in
section 10.18. If the voltage drop is again greater than 0.1 V, call technical support.
8.
If the drop is less than 0.1 V, check the termination panel to the analytical processor cable for
pinched or exposed insulation. Also, check the feed-through auxiliary heater cable for similar
damage.
1 3 4 | N G C8 20 0 A N D PG C 1 00 0 US ER MA N UA L | 21 0 15 10 MNA H
Table
5-2).
10.14
remove the digital controller and disconnect the termination
Advertisement
Table of Contents
Troubleshooting
