LI3000
Uninterruptible Power Supplies
11
The Primary computer (with SeeUPS2020 Plus installed) is the computer that you will
use to control the UPS and make any change to the operation of the UPS. The
Secondary computer (with SeeUPS2020 installed) is unable to exhibit any control
over the UPS.
When power failure occurs, one of the following shutdown sequences will be
executed:
1. If the Primary and Secondary serial ports are both in use: the Primary computer
will start to count down (user controlled delay) for shutdown (User Control delay
can be set in the SeeUPS2020 Plus software. Recommended time is 5 minutes).
Once the Primary computer is shutdown, the UPS will signal the Secondary
computer and initiate the Secondary to shutdown. The UPS default shutdown
time is 2 minutes. Therefore, it is recommended that Secondary computer is set
to shutdown within 1 minute in SeeUPS2020 Software.
2. If only the Secondary serial port is in use: the Secondary computer will shutdown
following the user settings in SeeUPS2020 Software. However, the Secondary
computer will not be able to signal the UPS to shutdown. Therefore, the UPS will
only power off when it is in low battery.
Figure 2: Dual Serial Port and Software Installation
