OPERATION
AVTMTTR310 Rev 8 May 2016
87
Error Messages
When an error message appears in the transformer test result screen indicating an
abnormal operating condition, verify the condition by taking a repeat
measurement before attempting to take any corrective action. Also, refer to the
Troubleshooting section for malfunctions and possible causes.
Open connections, wrong connections, open windings, shorted windings, high
resistance windings, other abnormal transformer problems, or a combination of
these may cause a large deviation from normal turn ratio or indicate an unusual
message. The unusual operating conditions may be caused by an abnormal
leakage reactance or capacitive coupling within the transformer windings. If
abnormal operating conditions occur during transformer testing, the following
error messages will appear on the quick test result screen and the transformer
test result screen, accompanied by three short beeps.
CHECK CONNECTIONS
This message indicates that the transformer is not connected to the test set. The
message may be caused by poor connection of one of the test leads, as well.
PHASE A (or B, or C) EXCITATION CURRENT TOO HIGH
This message indicates that excitation current exceeds 500 mA. Excitation
current can be reduced by using lower test voltages (40 V or 8 V).
TURNS RATIO TOO LOW, <0.8
This message shows that a transformer under test turn ratio is less than 0.8. The
TTR310 is not designed to test a transformer turn ratio under 0.8.
PHASE A (or B, or C) TURNS RATIO TOO HIGH
This message shows that a transformer under test turn ratio is higher than 10,000
(if 80 V or 40 V is used) or is higher than 4,000 (if 8 V is used). The message may
be caused by poor connection of one of the test leads, as well.
CHECK PHASE A (or B, or C) CONNECTIONS, REVERSED
This message is caused by incorrect connection of the H and X leads. The H and
X leads have either been reversed or the test transformer connections or
markings do not comply with the requirements of ANSI, IEC, or the Australian
standard. The message may be caused by wrong diagram number specified, as
well.
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