General Design Features; Environmental; Power Limiting; Ground Fault Detection - Siemens FC901-U3 Installation, Operation And Maintenance Manual

GENERAL DESIGN FEATURES

Environmental

The FC901 panels and subassemblies are suitable for use in a dry, indoor or protected
location.

Power Limiting

The AC power connection, battery wiring and four system status relays are not power limited.
All other circuits leaving the control panel meet the requirements for power limited circuits
when installed in accordance with the National Electrical Code and local requirements.

Ground Fault Detection

The control panel provides system ground fault detection. Main board ground fault event is
annunciated as a trouble condition on the system. In addition, the addressable circuit and
serial interface circuit have their own ground detection circuitry and indicator.
System- NAC (+) Ground Fault Threshold <20kΩ
System- NAC (-) Ground Fault Threshold <20kΩ
System- Auxiliary Power (+) Ground Fault Threshold <5kΩ
System- Auxiliary Power (-) Ground Fault Threshold <5kΩ
System- City Tie (+) Ground Fault Threshold <5kΩ
System- City Tie (-) Ground Fault Threshold <5kΩ
SLC grounding detection threshold
SLC(+) – Ground <5kΩ
SLC(-) – Ground <5kΩ

NAC Operation

The notification appliance circuits are controlled by the system microprocessor in accordance
with the site specific system configuration.
The notification appliance circuits can operate audible and visual notification appliances. Each
NAC can provide any of five software-generated codes or continuous operation to audible
notification appliances. Also, each NAC supports synchronization of visual notification
appliances.
Silence Inhibit - The control panel may be programmed to inhibit silence for up to four minutes
from the first alarm.
All of the NACs are power limited.

Security Features

Multi-level password protection of programming functions prevents unauthorized configuration
changes.
Device type supervision: If the device type identifier reported by an addressable detector or
module does not agree with the configuration, the system reports a trouble condition.
Device address supervision: The system checks that all configured devices on the addressable
device circuit respond to an address poll. The system reports a trouble condition if the
following conditions are detected:
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