38 Eaton Static Transfer Switch 2000A 3-Pole Installation and Operation Manual 164001127—Rev 01
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The ROI panel is located in a covered compartment just below the touchscreen display. Login is not required to
use the ROI; key access to the front doors provides security.
The ROI panel is always active: the toggle switches are enabled and the LEDs are valid in both Normal and
Redundant modes (see Figure 16 for an explanation of LEDs and toggle switches).
The ROI panel has these functions:
1. The ROI panel sets the operational mode of the STS, either Normal or Redundant Mode (see
Chapter 8 Operational Modes):
a. The MODE OF OPERATION toggle switch should be left in NORMAL except for rare circumstances.
b. When the MODE OF OPERATION toggle switch is set to REDUNDANT, both the ROI panel and the
touchscreen display are active, if the Monitor and display are operating properly, but the SAS board
controls transfers, not the Monitor. Redundant Mode is required, for example, when the Monitor must
be restarted, because it provides a backup transfer capability while the Monitor is restarting.
Circumstances requiring Redundant Mode are rare and time spent in Redundant Mode should be
brief.
2. In Normal Mode, the ROI panel automatically backs up
a. the display, providing a means to manually transfer the load if the touchscreen is not functional, and
b. the Monitor logic, if Monitor logic fails. The SAS board is always in standby mode, providing
continuous backup to Monitor logic and the display.
3. In REDUNDANT mode, the ROI can also be used to directly initiate a transfer using the SOURCE
SELECTOR momentary toggle switch.
NOTE 1: The SOURCE SELECTOR switch operates slightly differently in Normal and Redundant modes:
• In Normal mode, it sets the Preferred Source control to Source 1 or 2, as selected. This can cause a
transfer, if other circumstances allow it.
• In Redundant mode, it causes an immediate transfer to the specified source, if the target power
source is within specification and the load is not already on that source.
NOTE 2: The MAINTENANCE light on the ROI panel refers to the Maintenance Bypass, an internal switch
used by service personnel to disable MCCB/MCSW trip units during maintenance.
Operational Interfaces
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