APC 990 User Manual
Configuration: How to Configure the System
Symmetra MW with External Bypass Static Switch Operation Manual - 990-1377D-001
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Change the touch-screen settings:
– Brightness: Place the finger on the indicator
and slide it left or right to the desired setting.
– Contrast: Place the finger on the indicator and
slide it left or right to the desired setting.
– Backlight mode: Select “Always on” or “Off
after inactivity”.
– Backlight timeout (minutes): Select the time
limit for turning off the screen backlight.
– Recalibrate Display: Press this button to
initiate the calibration of the screen.
Note: If the backlight mode is set to “Always on” this will reduce the lifetime of the display.
Note: If a display reboot is required, it can be achieved by recalibrating the display.
How to configure the Modbus Settings screen
The Modbus Settings screen allows monitoring of the UPS by a Building Management System (BMS).
Press the Modbus Settings button on the User
Configuration screen to access the Modbus
Settings screen.
Configuration screen to access the Modbus
Settings screen.
Change the modbus settings:
– BMS modbus RTU address: The modbus
address of the UPS device.
– Baud rate: Select 9600, 19200, 38400, 57600,
or 115200.
– Parity: Select None, Odd, or Even.
Press Apply Changes to complete the changes.