This feature can be used to protect the tapchanger switch during periods of excessive
current. This feature can be effectively disabled by setting the blocking current to 640 mA.
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 0.4 Vac. When these conditions
exist the control will initiate an alarm and block regulation. The Delta Voltage is measured
on every tap operation once Load Current is less than 4 mA.
Regulation will be blocked until one of the following conditions exists:
•
Power to the control is cycled
•
The control is switched to Manual remotely
•
The control is switched to Manual via the Auto/Manual switch on the control adapter
panel
•
The Low Current Alarm is cleared/reset • Load Current measurement is greater than
or equal to 4 mA for 1 second
The Alarm Reset is located on the "Programmable Alarm" dialog screen and in HMI
"Configuration/Programmable Alarm/CLR Low Current Block.
7.2.1
Setting the Overvoltage Block Raise and Block Lower Limit from
the HMI
1.
Press the Up Arrow (SETP Hot Button) pushbutton to wake the unit. The menu will
advance to "SETPOINTS".
2.
Press the Down Arrow pushbutton once. The unit will display the following:
Profile Settings
3.
Press the Right or Left arrow pushbuttons, as necessary, to navigate to the "Limits"
menu.
Editing Setpoints in the wrong Setpoint Profile can cause the control
to operate incorrectly.
4.
Verify that the desired Setpoint Profile is indicated, then press the Down arrow as
necessary to display the following:
Block Raise (Lower) Voltage
128.0 Volts
5.
Press the ENT pushbutton. If prompted, enter a valid Level Access Code. The
following will be displayed:
Block Raise (Lower) Voltage
Section 7
1VAC388793-MB A
Setpoints
496
TCC300
User Manual
Summary of Contents for TCC300
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