Synchronous motors tolerate only extremely short interruptions of supply without loss of synchronism. In practice, the dead time should be sufficient to allow the motor no-volt device to operate. Typically, a minimum dead time of 0.2-0.3 seconds is recommended.
– To override all instances of the expansion of a specified host name by the addition of the
domain name, set the domain name field to its default, somedomain.com, or to 0.0.0.0.
– To override the expansion of a specific host name entry, include a trailing period. The NMC
recognizes a host name with a trailing period (such as mySnmpServer.) as if it were a fullyqualified domain name and does not append the domain name.
• Domain Name (IPv6): Specify the IPv6 domain name here.
Test DNS configuration
Path: Configuration > Network > DNS > Test
Use this option to send a DNS query that tests the setup of your DNS servers by looking up the IP address.
View the result of a test in the Last Query Response field, or identify the value to be used for the selected
query type:
Configure Web access
Path: Configuration > Network > Web > Access
To activate changes to any of these selections, all users must log off:
• Enable HTTP (the default): Enables Hypertext Transfer Protocol (HTTP), which provides Web
access by user name and password, but does not encrypt user names, passwords, and data
during transmission.
• Enable HTTPS: Enables Hypertext Transfer Protocol (HTTPS) over Secure Sockets Layer (SSL).
SSL encrypts user names, passwords, and data during transmission, and authenticates the Rack
ATS by digital certificate. When HTTPS is enabled, your browser displays a small lock icon. For
more information on HTTPS, see “Creating and Installing Digital Certificates” in the Security
Handbook, available at www.apc.com.
• HTTP Port: The TCP/IP port (80 by default) used to communicate by HTTP with the Rack ATS.
• HTTPS Port: The TCP/IP port (443 by default) used to communicate by HTTPS with the Rack
ATS.
For either of these ports, you can change the port setting to any unused port from 5000 to 32768
for additional security. Users must then use a colon (:) in the address field of the browser to
specify the port number. For example, for a port number of 5000 and an IP address of
152.214.12.114:
http://152.214.12.114:5000
https://152.214.12.114:5000
• Minimum Protocol: Select minimum security protocol from the drop-down list.
• Require Authentication cookie: By selecting this check box, you can require the DHCP server
to provide a cookie which supplies information to the Rack ATS. (see DHCP option 43 on
page 79).
• Limited Status Access: Select Enable to display a public, read-only web page with basic device
status. Select Use as Default Page to make this status page the landing page for the ATS.
Query Type Selected Query Question to Use
by Host The URL name of the server
by FQDN The fully qualified domain name of the server, my_server.my_domain
by IP The IP address of the server
by MX The mail exchange address of the server
