User`s guide

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USER’S GUIDE AUTOMATIC TRANSFER SWITCH
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Main screen status fields. The main screen reports status in the following
fields:
•A Stat field that reports the Network Management Card status.
Stat : P+ N+ A+
•An Automatic Transfer Switch field:
– Source A selected or Source B selected indicates which source is
currently supplying power to the load.
– Switchover Possible or Switchover Not Possible indicates
whether the load can be switched to the alternate source. The load
can be switched only if the line voltage and frequency of the
alternative source are in an acceptable range.
P+
The APC operating system (AOS) is functioning properly.
N+ The network is functioning properly.
N? A BOOTP request cycle is in progress.
N– The Network Management Card failed to connect to the network.
N! Another device is using the Network Management Card’s IP address.
A+ The application is functioning properly.
A– The application has a bad checksum.
A? The application is initializing.
A! The application is not compatible with the AOS.
Note
If the AOS status is not P+, contact APC Worldwide
Customer Support, even if you can still access the Network
Management Card.