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Symptom
•
Operational LED is
Off
•
•
Operational LED is
On but Does not Blink
•
•
Operational LED
Blinks Red
•
Operational LED is
NOT Definite Red or
Green
•
"PGRM" Appears in
•
Settings Display
Window
"ERR" Appears in
•
Setting
•
"RAM" Appears in
Settings Display
Window
•
Current Readings
Appear Incorrect
•
•
•
Protective Relay
Indicates a Trip, but
Circuit Breaker
Doesn't Open
•
Manual Reset
•
Function not
Operational
Caution: When the MD-3000 Protective Relay is Powered, it Supplies Voltage to the "b" Contacts
TABLE 5.1 TROUBLESHOOTING GUIDE
Probable Cause
Protective Relay's Control
Power is Deficient or
Absent
Protective Relay is
Malfunctioning
Protective Relay's Control
Power is Deficient or
Absent
Protective Relay is
Malfunctioning
Internal Problem Detected
Internal Problem Detected
Set points are Invalid
Check sum did not Match
There was an Error While
in the Test Mode
An Internal RAM Check
Failed
Incorrect CT Ratio used in
Equipment
Incorrect Current Wiring
Incorrect System
Frequency Programmed
Improper Wiring from
Protective Relay
Unit in Test Mode with "No
Trip Test Selected"
Damaged Reset
Pushbutton
For more information visit:
Possible Solution(s)
•
Verify that Control Power is Connected
Between TB1 -5 and B1 -6 and that it is
within Specifications
•
Replace the Protective Relay
•
Verify that Control Power is Connected
Between TBI-5 and TBI-6 and it is within
Specifications
•
Replace the Protective Relay
•
Press Reset Pushbutton
•
Reprogram Set points
•
Replace Protective Relay if Symptom
Persists
•
Press Reset Pushbutton
•
Reprogram Set points
•
Replace Protective Relay if Symptom
Persists
•
Reprogram Set points
•
Replace Protective Relay if "PGRM"
Reappears After Saving Settings
•
More than 0.1 Per Unit of Current Cannot
Flow While in Test Mode
•
Remove Power from the Protective
Relay and then Reapply Power - If the
Symptom Persists, Replace the
Protective Relay
•
Verify CT Ratio in Equipment
•
Verify Connections on CT Wiring
•
Set to Correct Frequency
•
Check Trip Relay Wiring
•
Check that Trip Contact on Protective
Relay makes
•
Select Trip Test while in the Test Mode
•
Check Wiring from Protective Relay to
Circuit Breaker Trip Coil
•
Check that Circuit Breaker has Source of
Tripping Power
•
Replace Protective Relay
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Initial Release
Reference
•
Paragraph 2-3
•
Paragraph 5-3
•
Paragraph 2-2
•
Paragraph 5-3
•
Paragraph 2-2.1
and 3-2
•
Paragraph 3-3.2
•
Paragraph 6-3
•
Paragraph 2-2.1
•
Paragraph 3-3.2
•
Paragraph 5-3
•
Paragraph 3-3.2
•
Paragraph 5-3
•
Paragraph 3-4
•
Paragraph 5-3
•
Paragraph 1-3
•
Figure 1-3
•
Paragraph 2-1.4
•
Figure 4-3
•
Paragraph 3-4
•
Wiring Plan
Drawing
•
Wiring Plan
Drawing
•
Paragraph 5-3
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