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Table 10 . Function codes (continued)
Parameter
Unit of
Measure
Security Level
Default Value
Key Entry Limit
To Read
To Write
To Reset
Low
High
056 Reverse Sensing
Mode
Locked Forward
---
View
Modify
NA
Locked
Forward
NA
NA
•The control offers ten different response characteristics for power flow operation. See
Section 6: Control Features: Reverse power operation
for more information on the reverse
sensing modes.
•Options include: Locked Forward; Locked Reverse; Reverse Idle; Bi-directional; Neutral
Idle; Co-generation; Reactive Bi-directional; Bias Bi-directional; Bias Co-Generation;
Reverse Co-Generation.
•The current threshold set at FC 57 must be exceeded for some modes to function.
•If an alternate configuration is active, the fourth LCD line displays which alternate is
active, e.g. (ALT CONFIG 1).
057 Reverse Current
Sense Threshold
X %
%
View
Modify
NA
1
1
5
•This is the percentage used to determine the current threshold at which the control
recognizes current flow direction. Below the threshold, the current flow is considered to
be indeterminate.
•This threshold is programmable as a percentage of the rated CT primary rating.
•Example: A regulator utilizing a CT with a 400:0.2 ratio with a 1% threshold would have a
current threshold of 4 A. The Load Current Metering-PLUS screen would also display the
4 A threshold.
•The metering of the control switches on a fixed 1% threshold, independent of FC 57.
•If an alternate configuration is active, the fourth LCD line displays which alternate is
active, e.g. (ALT CONFIG 1).
058 Bias Co-Gen Alt
Mode
Locked Reverse
---
View
Operate
NA
Locked
Reverse
NA
NA
•This setting is used in conjunction with the Reverse Sensing Mode (FC 56) of Bias
Co-Generation only. The setting goes into effect when operating in that mode and when the
control determines that a reversal of current has occurred on the system that is due to a
switching operation, a true reversal of power. Under these circumstances, the control will
revert to the mode of operation specified in this setting.
•Options include: Locked Reverse; Neutral Idle; Reverse Co-Generation.
069 Auto Operation
Blocking Status
Normal
---
0
Modify
NA
Normal
NA
NA
•This feature enables blocking of automatic operation locally and via SCADA communications.
•Options include: Normal; Blocked.
•Normal refers to normal automatic operation. Blocked refers to a state when automatic
operation is inhibited.
•Example: This function can be used to perform a desired amount of voltage reduction and
then disable the tap-changer (inhibit additional operations) for an indefinite time
period.
•If FC 69 has been set to Blocked using SCADA, the operator may override the SCADA system
by changing FC 69 from Blocked to Normal.
•Refer to
Section 6: Control Features: Supervisory control and data acquisition (SCADA)
for
additional information concerning the SCADA interaction with the control.
•If an alternate configuration is active, the fourth LCD line displays which one is active,
e.g. (ALT CONFIG 1).
65
INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS
MN225003EN April 2018
CL-7 Voltage Regulator Control