Installation Uninterruptible Power Supply
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4.6 Uninterruptible Power Supply
If you are using uninterruptible power supplies (UPS) they must be earthed sepa-
rately.
The total leakage current must not exceed 3.5 mA per mains socket. Use the
leakage current specified by the UPS manufacturer as a reference.
An MPS+1-AC power supply unit has a leakage current of < 0.5 mA.
A 900-watt UPS is entirely sufficient to power the OpenCom 510.
4.7 Power Failure
In the event of a power failure, the system memory will retain all data (program
and user data) without any changes.
The internal clock will continue to run for 24 hours. If the power failure lasts longer
than 24 hours, the time and date will be reset to the factory setting when power is
switched on again, and updated (by means of a signal from the exchange) after
the first external outgoing call.
With multi-terminal access configurations, the OpenCom 510 provides an emer-
gency service feature: In the event of a power failure, the S
0
1 interface will be
switched to the S
0
8 interface, enabling you to make calls through a connected ter-
minal.
The following is required to enable emergency service:
■ An MX+S01-8 interface card must be installed.
■ The power failure circuit of this interface card must be activated. To do so, set
DIP switches S17 to S20 to “ON”. The interface card is delivered with the power
failure circuit deactivated (default: off).
■ Port S
0
1 must be connected to an NTBA (multi-terminal access) and configured
as an external connection.
■ Port S
0
8 must be configured as an internal connection. An ISDN telephone
with emergency service capability must be connected to this port.
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