Eaton E Series - Serial RS232 Connection

4.4 Protection and Control
Description Information Corrective Action
After 󰃰rst start-up of the protective device there is a
pending trip.
Two red LEDs are illuminated at the front of the
HMI. They indicate a trip and an alarm.
With the factory default settings the protection relay is
con󰊟gured with an undervoltage protection. Adapt the
settings of the undervoltage protection or remove this
module from the device project settings (if you do not
need it). If you have any problems with acknowledging
the pending alarm, please refer to “The binary outputs or
LEDs are in unexpected state”.
The switchgears cannot be operated by SCADA
communication.
Set the [Control / General Settings] »Switching
Authority« of the device to either “Remote” or “Local and
Remote”.
Problem with current and voltage measurement. The measured values of current and voltage
show a big 󰅱uctuation.
Adjust [System Para / General Settings] »f« to the
connected grid frequency (50 Hz or 60 Hz).
The trip command is kept in latched state. A latched trip command has been recon󰅰gured
from latched to unlatched.
Only until Release 3.5: The status of the trip command
must be acknowledged once, if it had already been
pending before the recon󰊟guration.
(As of Release 3.8, no action is required.)
Independent of this, note that a latched trip command
even »survives« a restart of the device.
Relay outputs do not react. The contacts of the outputs do not open or close.
This can be checked by simulating a fault and
checking the output contacts with measurement
equipment.
Check the following issues:
• Acknowledge the outputs, if applicable.•
• Is the status of the output forced to a dedicated•
value? (The output can be overwritten for
commissioning purpose, see menu branch [Service /
Test - Prot inhib.].)
• Is the correct parameter set active (1…4)?•
• Is the required protection function active?•
• Is overall protection active?•
•
Are the 󰊟eld parameters set correctly (CT ratio etc.)?
•
• Are the protection parameters set correctly (trip•
value, trip time)?
•
Is the assigned protection function blocked?
•
• Is the protection function's trip signal routed to the•
Trip-Manager of the correct switchgear?
• Is the trip signal of the switchgear routed to the•
correct relay output?
•
Is the wiring correct?
•
18 www.eaton.com E-Series Family Troubleshooting Guide
4 Problems with the Device
4.4 Protection and Control