The fourth line is used to display the physical P.I. ADD-AMP
settings corresponding to the physical position indicator.
ote:N Physical ADD-AMP always takes precedence over
soft.
EXAMPLE 1:
Tap Position 8
SOFT-ADD-AMP -12, 14
P.I. ADD-AMP -14, 16
Present tap position = 8 Raise
Soft ADD-AMP feature = On
Soft ADD-AMP feature lower tap limit = -12
Soft ADD-AMP feature upper tap limit = 14
P. I. ADD-AMP lower tap limit = -14
P. I. ADD-AMP upper tap limit = 16
EXAMPLE 2:
Tap Position -12
At Limit
SOFT-ADD-AMP -12, 14
P.I. ADD-AMP -14, 16
Present tap position = 12 Lower
Tap-Changer at ADD-AMP Limit
Soft ADD-AMP feature = On
Soft ADD-AMP feature lower tap limit = -12
Soft ADD-AMP feature upper tap limit = 14
P. I. ADD-AMP lower tap limit = -14
P. I. ADD-AMP upper tap limit = 16
EXAMPLE 3:
Tap Position 0
P.I. ADD-AMP -14, 16
Present tap position = Neutral
Soft ADD-AMP feature = Off
P. I. ADD-AMP lower tap limit = -14
P. I. ADD-AMP upper tap limit = 16
EXAMPLE 4:
Tap Position 14
At Limit
SOFT-ADD-AMP -12, 14
P.I. ADD-AMP -14, 14
Present tap position = 14
Tap-Changer at ADD-AMP Limit
Soft ADD-AMP feature = On
Soft ADD-AMP feature lower tap limit = -12
Soft ADD-AMP feature upper tap limit = 14
P. I. ADD-AMP lower tap limit = -14
P. I. ADD-AMP upper tap limit = 14
ote:N Both the Soft ADD-AMP feature and the physical
ADD-AMP settings on the Position Indicator
will prevent any further lower tap changes. This
conclusion is based on the assumption that the
P.I. ADD-AMP configuration settings, entered by
the user, match the physical position indicator limit
settings.
EXAMPLE 5:
Tap Position 15
At Limit
P.I. ADD-AMP -14, 12
Present tap position = 15
Tap-Changer above ADD-AMP Limit
Soft ADD-AMP feature = Off
P. I. ADD-AMP lower tap limit = -14
P. I. ADD-AMP upper tap limit = 12
ote:N User-configured upper "P.I. ADD-AMP" tap limit does
not match the upper physical tap limit setting on the
Position Indicator. Assuming the present tap position
is correct, the physical upper P.I. limit switch must be
at position 16.
This condition may occur if the user-configured
P.I. ADD-AMP limits do not match the physical
location of the P.I. ADD-AMP limit switches. In this
example, the regulator is at tap position 15, yet the
user-configured upper P.I. ADD-AMP limit is 12. The
control will advance the tap-changer beyond the user-
configured P.I. ADD-AMP limit settings provided the
actual mechanical P.I. limit switches do not prevent the
operation. If the tap-changer is at, or beyond, either
user-configured "P.I. ADD-AMP" limit, At Limit will
appear on the second line.
146
INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS MN225003EN April 2018
CL-7 Voltage Regulator Control
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