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The “REMOTE” indicator button will light green when the unit is under remote control.
Pressing the “REMOTE” indicator button will toggle the control mode between Remote
and Local. The unit can be controlled remotely from either the RS485/RS422 port or the
Ethernet port. If the NSU is left in the local control mode, after thirty minutes of front
panel in-activity the NSU will default to the “REMOTE” control mode.
Operating parameters can always be examined locally or remotely. Parameters can
only be changed from the front panel while in local control mode. Parameters can only
be changed from the remote ports while in remote control mode. The NSU will always
power up in Remote control mode. If the NSU is left in the local control mode, after a
thirty-minute period of no front panel keypad activity the NSU will switch back into
Remote control mode.
At power-up the NSU will always set all primary converters to their online position. The
backup converter will always be put in the standby position. This precaution is taken to
prevent the possibility of having a converter online operating at the wrong frequency. It
also removes the possibility of having more than one converter competing to be in the
standby position at one time.
3.2.1 KEYPAD OPERATION
The keypad includes a “STATUS” key for immediate access to fault conditions and the
event log. A full set of numeric Data Entry keys, accompanied by up, down, left and right
arrows, simplifies operator entries. The “ENTER” key is provided to submit data entries.
A “C” (clear) key is available to cancel a data entry. A beeper will sound to acknowledge
each key press. An error tone will sound for illegal entries.
Also included is a dedicated “REMOTE” key to easily switch between Local and Remote
control modes. While in the Remote control mode (“REMOTE” button illuminated), local
data entry is prohibited. However, all system parameters can be examined from the
front panel.
After one minute of idle time the display will default to the Redundancy Chain Status
Screen.
3.2.2 SCREEN NAVIGATION
The cursor will appear as either two vertical arrows (one up arrow “
↑
” on the top line,
and one down arrow“
↓
” on the bottom line) or as a single inverted, flashing right arrow
“
→
”. This indicates the direction of navigation. While the cursor appears as two vertical
arrows use the up and down arrow keys to navigate between screens. Press the left or
right arrow key and the cursor will appear as a right arrow “
→
”. When the cursor is a
right arrow “
→
” the data field to the right of the cursor is selected. Use the left and right
arrow keys to navigate between fields within a screen Pressing the “C” key will change
the cursor back to ”
↑
” and “
↓
” arrows at the left of the screen. When the ”
↑
” and “
↓
”
arrows appear at the left of the screen use the up and down arrow keys to scroll through
the screens listed below. This provides visibility of all pertinent data in both Local and
Remote modes.