Core Power Solutions (DV2-C16 Models)
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Copyright © 2008-2009 Eaton Corporation. All Rights Reserved.
IPN 997-00012-71B July 2009
Replacing the MOVs
MOVs must be functional at all times. In practice, it is impossible to predict when a MOV will
fail. That depends entirely on the number and magnitude of the transients sustained.
For that reason we recommend the following, depending on how accessible the site is.
•
For easily accessible sites
– If a MOV has failed (as indicated by a MOV Fail alarm or the
visual indicator), then replace all the MOVs as soon as possible.
•
For remote sites with difficult access
– Replace all the MOVs during scheduled
maintenance visits, whether they have failed or not.
We strongly recommend inspecting the MOVs in the main ac switchboard at the same time and
replacing them as appropriate.
If any MOV or other transient protection device has failed then the design of the primary and
secondary transient protection systems, and the maintenance plan, at that site must be
reviewed.
Battery Mid-point Monitoring (String Fail) Alarm
Use the following procedure if a
String Fail
alarm is generated.
Step 1 - Identify the faulty battery string
1
Press any button on the SC200 to silence the alarm.
2
Connect to the SC200 using DCTools/Web. Go to
Batteries
>
Mid-point
Monitoring
.
3
Click + to expand the
Mid-point Monitoring
table to identify which battery
string has failed.
Step 2 - Check cell/monobloc voltages
1
Use a suitable voltmeter to measure the individual cell/monobloc voltages.
Measure on the cable lugs and inter-connecting bars so that loose connections
will also be detected.
2
The faulty or poorly connected cell/monobloc has the voltage with the greatest
deviation from the average.
Step 3 - Check cell/monobloc terminals
1
Check the terminal connections of the cell/monobloc are correctly tightened
and clean.
Refer to the battery manufacturer's instructions for correct terminal torque
settings.
2
In DCTools/Web go to
Batteries
>
Mid-point Monitoring.
Click
Clear String Fail
.
3
If the alarm clears then the fault is fixed. No further action is required.
