Setup and adjustments
Data protection battery
The network engine is shipped with the data protection battery installed and connected. Do not
disconnect the battery for any reason other than to replace a defective battery.
The 24 VAC supply power to the network engine charges the data protection battery. At initial
startup, the battery may require a charging period of at least 4 hours before it supports data
protection if power fails. Maximum protection (up to 3 consecutive power failures without
recharging time) requires a 15-hour charging period.
The data protection battery slowly loses charge when 24 VAC power is removed from the network
engine. If the battery completely loses charge, the network engine real-time clock stops.
Whenever a network engine is disconnected from 24 VAC power for over 30 days, ensure that the
real-time clock is set properly (from the user interface) and that the network engine is powered
long enough to recharge the data protection battery.
Powering on the Network Engine
After applying 24 VAC power, the network engine requires approximately 2 minutes to start up and
become operational. See the
section.
Startup is complete and the network engine is operational when the (green) RUN LED is On steady
and the (red) FAULT LED is Off (Figure 14).
Important:
Wait for the network engine to complete the start-up sequence and the RUN LED
to go On steady before initiating any other action on the network engine.
Disconnecting power from the Network Engine
When 24 VAC supply power to a network engine is disconnected or lost, the network engine is
nonoperational, but the POWER LED remains On and the data protection battery continues to
power the network engine for approximately 1 to 5 minutes while volatile data is backed up in
nonvolatile memory. The RUN LED goes Off when data backup and shutdown are complete.
Important:
The data protection battery must be installed and charged before disconnecting
the 24 VAC supply power.
Setting the end-of-line switch
RS485 serial protocol bus segments require proper EOL termination to reduce interference from
signal bounce back on the bus segment.
FC Bus (MS/TP) applications require a terminated device at each end of each FC Bus segment. See
Wiring rules and guidelines for network integrations
section for more information on EOL
requirements on an FC Bus.
N2 Bus applications require at least one terminated device on each N2 Bus segment, but two
terminated devices, one at each end of the N2 Bus segment, are recommended. See the
rules and guidelines for network integrations
section for more information on EOL requirements on
an N2 Bus.
The network engine is shipped with the EOL switch in the factory default, ON (up) position (Figure
12). See Figure 13 to determine the appropriate EOL switch setting for the network engines on N2
Buses and FC Buses.
NAE35/NAE45 Installation Guide
18
