I-GARD DSP-OHMNI Instruction Manual
24
The following Events are supported:
Type of Event Interpretation Possible Cause
Bus Fault Fault occurred which was not a) Fault upstream in duct or
identified by any Feeder Module transformer
b) Fault in unprotected Feeder branch
Phase Loss Loss of a phase on the Fuse Open
DDR2 resistor
3- Phases Lost No power on DDR2 resistor unit Power Disconnected
Feeder Fault Fault occurred on identified Momentary Ground Fault on Feeder
Feeder
The event will remain until superseded by another fault, which will rewrite over the previous data. The
data is volatile and will be cleared on a power interruption or operation of the RESET button.
11 MAINTENANCE AND TESTING
Due to the solid state design and the use of sealed components, it is not necessary to service the
DSP other than occasionally dusting with a damp cloth or vacuum cleaner during regular switchboard
maintenance.
To test the DSP it will normally be sufficient to use the SELF-TEST procedure (as described in
section 9).
To test the system in the field involves placing a ground fault on one of the lines. This should only be
performed with the permission of the owner and by qualified individuals using proper techniques, to ensure
safety to plant, equipment and personnel.
DANGER
Hazard of Electrical Shock, Burn or Explosion
All installation, servicing and testing referred to in this manual must be performed by
qualified personnel. All power should be disconnected prior to removing covers or
enclosures and where live conductors may otherwise be exposed.
Failure to observe these precautions may result in death or severe personal
injury and damage to equipment.
Before placing an intentional ground fault on the power system, check that a
fault does not already exist. Any test ground fault equipment must be rated
for full system voltage and be fused for protection.
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