10
Note:
The reference values from
STRING SUMMARY
and the website are guidelines only.
Midtronics updates the website with new reference values when they are created. If you
create a reference value for a jar model, e-mail the value and information to
[email protected] or fax it to 630.323.7752 (Attn: Reference value list).
Testing a sample of jars
To test a sample of jars for a reference value:
1. Choose at least 30 jars from one manufacturer with the same make, model, power rating,
age (within 6 months), and service history.
2. Record this information about the jars:
•
Jar manufacturer
•
Model number
•
Date of manufacture
•
Date of installation
•
Condition the jar operates in, such as charge voltage (volts per cell), temperature,
and DC current through the jar
•
Visible warnings, such as leaking acid, corrosion, or distorted jar cases
3. Test the jars. Refer to “Chapter 3: Testing.”
4. Test one jar five times in a row on float charge. You should get the same conductance
result.
Note:
If the test results do not conform to this pattern, an electrical signal might be
present in the system.
5. Figure the average conductance of the jars.
Note:
Do not include jars that are higher or lower than 30% from the average because
they might be outside an acceptable range.
Using the average in STRING SUMMARY
If you cannot obtain a reference value for a string, test the string and use the average
conductance value (
AVG. SIEMENS
) in the
STRING SUMMARY
menu as your reference value. If
jars in the string have been replaced recently, test the new jars, especially if they correlate to the
HIGH
jar value in
STRING SUMMARY
.
