GE Industrial Solutions Entellisys System User Manual - Manual (Page 46)

Metering 46
4
Figure 4-12 Frequency spectra for currents
A description of the quantities available in the Harmonics Metering screen is given above.
4.8 Troubleshooting
Current reads zero or dashes
• Verify that the Messenger is communicating to the CPU in the System Health screen. See
Monitoring system health on page 179 for more information.
• Verify that the frame and CT ratings are properly configured. This information is available on
the Metering & Waveforms menu. See Basic configuration on page 35 .
• Verify the current exceeds 1% of CT rating. The system will zero the current if below 1%. To
verify this, trigger a waveform manually. The actual current will be displayed on the
waveform.
Voltage reads zero
• Verify that the circuit breaker has a source for voltage data and that the source has a valid
PT assigned to it by clicking Metering on the Metering & Waveforms screen. See Basic
configuration on page 35 . Also see PT Throw-Over on page 99 for more information.
Detailed, Demand, or Advanced metering buttons are grayed out
• Verify that the corresponding option has been assigned to that circuit breaker. See
Options
on page 37 .