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10. FAULT ACTIONS
If a system fault occurs, the display will brighten from its low intensity mode to identify the RTD ID number.
At the same time, the event will be recorded to the history buffer. Silence the beeper to proceed with cau-
tion to identify and correct the problem. During a fault, the fault relay (TB3) will trip until the fault is cleared
and the monitor is reset. Most faults can be attributed to the following detailed problems at the RTD.
* RTD 1 SYS FAULT *
RTD name field
ACKNOWLEDGE
TO SILENCE BEEPER:
Select the ACK button to silence the beeper.
.
TO RESET FAULT ALARM
The word FAULT will flash if the fault is active. When the fault
clears, the word FAULT will stop flashing and then the monitor
can be reset.
TO VIEW:
Select VIEW, then use the CURSOR ▼ to navigate to menus
for information. Select VIEW again to return to the fault alarm.
10.1 RTD SYSTEM FAULTS
1. Open RTD
2. Shorted RTD
3. RTD resistance is above or below the recommended range
as indicated in the temperature range chart below. The temper-
ature in the display will flash when out of range.
On a 3-wire RTD, the red or either one of the white signal wires
opening are considered the problem. Also, either white wire
shorting to the red can be the problem. Shorted or singular
opened white wires will not cause a fault but will influence the
temperature accuracy, depending on the length of the RTD
wires.
Menu indicates a system fault at RTD
ID #1.
10.2 EXCEEDING TEMPERATURE LIMITS
If a temperature drops below or exceeds the maximum value for the RTD type as indicated in the chart
below, the fault relay will change state. The fault relay performs an ‘OR” function for all four channels. All
exceeded temperatures must return to their authorized operating point before the fault relay is in normal
condition.
Sensor Type
Degrees F
Degrees C
Platinum #8
-202 to 1544
-130 to 840
Platinum #11
-202 to 1364
-130 to 740
Nickel #1,7
-94 to 572
-70 to 300
Copper #15
-58 to 482
-50 to 250
TEMPERATURE RANGES
WARNING: POWER MUST BE REMOVED FROM THE MONITOR BEFORE PERFORMING
ANY TROUBLESHOOTING.
Summary of Contents for EDISON ONGUARD 1604
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