EDWARDS SIGA-IM2 Fault Isolator Module

The Edwards SIGA-IM2 Isolator Module

is an addressable device that protects a signaling line circuit (SLC) from a to wire-to-wire short. The SIGA-IM2 module monitors line voltages and opens the data to detect a short, isolating the short between the two modules located closest to the short. The loop controller assigns an address to the SIGA-IM module. The module uses one detector address on the SLC.

• The Edwards SIGA-IM2 Isolator Module is part of GE Security’s Signature Series system. This intelligent device enables part of the Signature data loop to continue operating should a short circuit occur. The module will be wired into a Class A data loop at any point. For example, if a fault occurs, the isolator cuts power to all devices beyond the isolator on the loop as follows:
• a short on the line critically causes all isolators to open within 23 msec.
• at 10 msec intervals, beginning on one side of the Class A circuit nearest the loop, the isolators close to providing the next isolator down the line with power.
• when the isolator next to the short closes, it reopens within 10 msec.

Once activated, the line fault isolator continuously checks the faulted side of the loop to determine if the short still exists. Also, when the fault is removed, is automatically restores the entire data loop to a normal condition. The microprocessor in every module gives at least three important benefits Self-diagnostics and History Log, Mapping, and Fast, Stable Communication.