Page 91 - GuardII+ Series 4208 Platform PD User Manual

Troubleshooting

You will need to contact Iris Power LP Technical Support, but additional information will be
helpful.

NOTE:
When measuring the ac power signal, be sure to take safety precautions
that are appropriate for the voltage being measured.

• Examine the ac power using an oscilloscope. Once the traces are acquired, send
copies of them to Iris Power LP Technical Support.

7.4. PD Detection

Use this section for troubleshooting PD detection problems; this is characterized by the
downloaded measurements showing no PD activity in the PDView software.
Troubleshooting PD detection problems is an involved process that may need to be
customized depending on the exact installation. So instead of listing exact troubleshooting
scenarios as was done previously, this section will list common things to try.

NOTE:
A lack of PD activity does not automatically indicate a problem with the
GuardII+.
• Some assets may have a naturally low PD level.

• Some assets may exhibit a drop in PD after maintenance,
particularly if some problems that can cause PD or PD-like activity
were fixed.
The most obvious indicator of a problem with the monitor would be a
sudden disappearance of all PD pulses on one or more inputs when PD
was measured in the past.

7.4.1. Changing Sensitivity

If an input shows a sudden loss of PD activity, then the User, Auto and Alert Range
measurements will show no pulse activity, and the Auto Range will settle at the 2 mV-34 mV
sensitivity (although it may take more than a day for the Auto Range to settle).

• If this is the case, then there is no need to change sensitivity; the input is not picking
up any pulse activity. This may indicate a problem with the sensor or the cabling
between the sensor and the monitor; one of the other PD detection troubleshooting
methods described in this section may provide more information.
Otherwise, check the measurement results being recorded by the Auto Range; unless it is
still in the process of settling down to the 2 mV-34 mV sensitivity, there will be pulse counts in
the measurement results. This would mean that the monitor is operating correctly, which can
be confirmed by using other PD detection troubleshooting methods described in this section.

• Changing the User and Alert Range sensitivities to something more appropriate for the
new PD levels will get the monitor recording measurement results with data again,
however:

83
www.irispower.com