I-Gard IPC DSP OHMNI, Инструкция по эксплуатации

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DSP-OHMNI Instruction Manual I-GARD 21
Alarms
Alarm Relay (Form C) on DSP-DPS will operate to energize customers’ alarm device
(Horn etc.)
A local beeper will sound in the DSP-DM to indicate the fault
The Alarms both local and external can be cancelled by the MUTE button, which is actually the key when
in the Alarm Screen. It will not work on the Feeder or Pulse Screens. Once cancelled the Alarm will remain
OFF until about an hour after the last button has been pressed on the keypad of the DSP-DM when it will
resume if an Alarm condition still exists. RESET will also cancel the MUTE effect.
Display
The Home screen will change to an Alarm Screen which will indicate which phase is faulted, and the branch
circuit that is affected, with a screen similar to that of Figure 8.1
.
FAULT PHASE A
FEEDER 01 IG 67%
Figure 8.1 Alarm Screen
The faulted Feeder is identified by I/D number. The Total System Current IG will indicate the system current
as determined by the voltage from the DDR2 resistor unit (See 8.1 above). Note this may not be exactly the
same as the Feeder Current Igf that is indicated in the Feeder Module Screen since the sum of all leakages
will not necessarily be the same as that of one particular Feeder branch.
Feeder fault information can be determined by pressing
u
to move to the Feeder Screen. The Faulted Feeder
(if any) can be located by scrolling with
pq
keys to the faulted one. The current reading Igf relating to that
feeder is shown. It should exceed 50%. The FLT status will also confirm that this is the faulted circuit. In
addition, there will be an Alarm Indication on the faulted Feeder Module which is indicated by a continuous
red LED.
In this situation it then becomes necessary to determine the source of the fault. In some cases this might
be known problem but if the fault is not quickly identified then the risk is that a second fault may develop
and cause shutdown of one of the breakers.
To locate the fault easily the Pulse system can be turned on using
u
to enter the Pulse Control screen.
See Fault Finding section.