Nac Circuits - Siemens PAD-5 Series Installation Manual

Model PAD-5
1
Wiring and Configuring the PAD-5-MB
3.2.2
NOTE →The battery charger has priority over the total system current. If the batteries
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NAC Circuits

The PAD-5-MB main board circuits X300 and X400 as four Class B NAC circuits or
two Class A circuits. Configuration of Class A or B is done via the Zeus
configuration tool. The NAC circuits can also be configured through the software
tool for additional functions (See Section 1.2 Properties)
The NAC outputs are power limited and are supervised for short-circuit, overcurrent,
and open circuit. They are independently protected against direct short-circuits of
the output terminals. The synchronization protocol (output pattern) is built into the
unit, so no external module is needed. Synchronization on one P2 loop does not
require the use of the NAC follower input. If synchronization is required across
multiple P2 loops, then the NAC follower input must be used on all slave PAD-5-
MB. One master is required to provide the signal for the rest of the PAD-5-MB.
All NAC circuits are configured via the configuration tool. Refer to Zeus/OI Rev.
14.01 or later for information on all the features that can be configured for each
NAC circuit. The 24K Ohm EOL resistor assembly is shipped with the panel. The
PAD-5-MB has the ability to operate with EOL resistors in the range of 2.2K to 24K
Ohms. These EOL values do not need to be configured with the tool. The PAD-5-
MB handles them without user interaction.
are drained, more current needs to go to charging the batteries. Therefore, if
the NACs are configured as Auxiliary Outputs, they will be turned off while the
batteries charge. The OI will display an overcurrent condition. After the
batteries make it to float, the trouble will go out and the Auxiliary Outputs will
return to ACTIVE. The dedicated Auxiliary Output (X800) will remain on, even
if the battery charger is active. It is only NACs configured for Auxiliary Output
that are affect by the battery charger priority.
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