ABB TCC300, User Manual, Page: 587 / 716

9.6 Testing bias voltage
The Bias Voltage Status/Test Mode feature permits entering a bias voltage for simulating
the raising or lowering of the sensed input voltage. This exercises the control as if the input
voltage were being changed. The contacts actually operate.
This feature is valuable in the rapid determination of operating quantities present to
influence the normal operation of the control. Items that will block operations or change
setpoints are described here and illustrated by LEDs on the face of the control.
The Test Mode/Status screen displays control status information that includes:
• Output Status
• Compensated Voltage
• Band Status
• Runback/Blocking Status
• Voltage Reduction Status
This feature automatically resets on exit or in 15 minutes if not exited.
1. Press the ENT (UTIL Hot Button) pushbutton to awaken the unit. The menu will
advance to "UTILITIES".
2. Press the Down Arrow pushbutton once. The unit will display the following:
Calibration/Test
3. Press the Down arrow pushbutton as necessary to navigate to the "Bias Voltage
Status Test Mode" menu item.
4. Press the ENT pushbutton. The unit will display the following:
Bias Voltage 0.0
-- XXX.X --
The upper line of the display will initially indicate "0.0" bias volts.
The second line will display the sequence of parameters. By increasing/decreasing
the applied bias voltage the control will respond based on the settings entered into
the control.
1VAC388793-MB A
Section 9
Testing
TCC300 581
User Manual