
Low Current Block
When enabled the control determines if Load Current following a tapchange is less than
4 mA, coincident with Tap Delta Voltage being less than 4 Vac. When these conditions
exist the control will initiate an alarm and block regulation.
Individual Tap Wear
The number of operations on any single tap exceeds the Individual Tap Wear Alarm
setting.
Tap Changer Failure
When the Operation Counter Configuration is set to "Cam Follower" and this alarm has
been enabled, indicates the counter contact input has detected a Tap Changer Failure
condition.
A Cam Follower contact is a cam driven contact which is normally closed when the
Tapchanger is at rest, and opens and closes once during each tap operation in either
direction. If this contact does not open and close within 30 seconds after the control issues
a Raise or Lower in either local automatic or remote manual operational modes, this alarm
will activate. This alarm can be reset either by the Cam Follower contact operating
correctly during a subsequent Raise or Lower operation, or if reset by the user.
LDC/LDZ
Any value other than zero has been set for LDC/ LDZ.
Line Current Limit
The line current is exceeding the respective maximum current limit setting and the alarm
output is on due to this condition.
Reverse Power
Reverse power is present at the control and the alarm output is on due to this condition.
Abnormal Tap Position
Abnormal Tap Position is indicated when the alarm is enabled, KeepTrack™ is enabled
and the neutral input is detected but the present tap position at that instant is neither at
minus one nor plus one. The Abnormal Tap Position Alarm will also be activated when the
Motor Seal-in Failure detection feature has detected a Motor Seal-in Failure.
Voltage Reduction
Any level of voltage reduction is active.
Section 3
1VAC388793-MB A
Operation
74
TCC300
User Manual
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