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External Maintenance Bypass Switch Configurations
The External Maintenance Bypass Switch has three configuration options:
• External maintenance bypass installed with interlock option
• External maintenance bypass installed without interlock option
• Not installed
Regardless of how the configuration is set, if the auxiliary contacts are open, the user is unable to
issue a retransfer command through the manual transfer / retransfer screen.
If the option is installed and the auxiliary contact status is read as switch is in the Bypass or Mainte-
nance position, the “critical load shutdown” message reads “UPS off”.
Multiple Battery Cabinets
The Npower system offers an option allowing for the installation of more than two battery cabinets.
The option consists of a Multiple Battery Breaker (MBB) board that mounts on the control door and
an Input Contact Isolator (ICI) board that mounts in the option area (See the Multiple Battery
Breaker Option in the options manual.)
The ICI board allows the Npower system to sense multiple battery cabinets, and the MBB board
allows the UPS to support multiple battery cabinets by supplying power to the UVR coil of additional
battery cabinets.
To access the screen for setting the number of battery cabinets in the system, navigate from the
MAIN MENU to CONFIGURATION to SYSTEM SETTINGS, page 3. Select NUMBER OF BAT-
TERY CABINETS to bring up the following password-protected screen.
Figure 29 Set number of battery cabinets screen
Set the number of battery cabinets by changing the number in the highlighted box. Pressing SELECT
will save this information and return Operator to the System Settings Screen.
Table 4 External maintenance switch configuration options
External
Maintenance Switch
Options
Option Auxiliary Contact
Status User Prompt
Installed with
Interlock Option
open = On Test position or
Maintenance position, or jumper
removed
Prompts the user to rotate to On Line position,
Just before retransfer.
closed = On “ON LINE” position
(default jumper)
Manual or automatic start (one button) is
allowed all the way to load being On-line
Not installed
open = jumper removed
Prompts the user to install jumper just before
retransfer”
closed = default jumper
Manual or automatic start (one button) is
allowed all the way to load being On-line
Installed without
interlock option
Open = Jumper removed
Prompts the user to install jumper just before
retransfer”
Closed = default jumper
Prompts the user to verify the switch is in on-
line position before a retransfer is allowed
NUMBER OF BATTERY CABINETS
MIN MAX
1 6