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7.3 “SYSTEM FAILURE” LED
When a controller CPU trouble occurs, a hardware trouble is detected by the self-diagnostic function of any
sensor unit or a communication trouble between the controller and a sensor, the LED will be turn on, and the
“SYSTEM FAILURE” output relay will be activated.
(1) After receiving a sensor unit trouble signal, the controller will turn off the LED Nos. 1 to 7 (green) of the
mist indicator for the relevant sensor and make the LED Nos. 8 to 10 (orange) flash. Then, you can identify
the defective sensor unit.
The defective sensor unit will be automatically excluded from the calculation of deviation (mean value).
(2) When a cable is disconnected, a communication trouble will be detected on the sensor units in the
downstream of the disconnected point. In this case, mist indicator LED Nos. 0 to 7 (green) will go out, and
the LED Nos. 8 to 10 (orange) will flash. Then, you can identify the cable disconnection point.
(3) After the communication recovers normally, “SYSTEM FAILURE” will be automatically restored.
Even after recovery, the error message will be continuously displayed on the LCD until the system is reset
by the ENTER key.
System failures other than communication troubles are self-held. Turn off power with the power switch in
the controller, and remove the cause of the trouble.
After recovery from the trouble, turn on the power switch in the controller to reset.
(4) When a CPU trouble occurs, “SYSTEM FAILURE” will be output.
As for the details, see Section [15.Troubleshooting].
7.4 “PRE ALARM” and “HIGH ALARM” LEDs
There are two alarm statuses, “PRE ALARM” and “HIGH ALARM”. Upon occurrence of an alarm, the
indicating lamp (LED) and the output relay function.
The status message is displayed on the indicating LCD.
The mist indicator lamps are in the following conditions when an alarm occurs and when the alarm is cleared.
Operation point
Restoration point
“PRE ALARM”
No. 10 or above
or
At the time of deviation
unusual generating
No. 8 or below
or
At the time of a deviation
unusual return
“HIGH ALARM”
No. 15
(self-holding)
After mist density decreases
Press the ENTER key
for restoration.
Any deviation of the sensor level indicates the deviation alarm message of “PRE ALARM” when the level of
the sensor in question deviates by more than 4 levels from the average level of all the sensors indicated on the
mist indicator.
The “PRE ALARM” message is not continuously indicated, but automatically reset when the oil mist density
level goes down.
The message indicator is automatically reset when the deviation goes below the level 4 from the average level.
“HIGH ALARM” is self-held, and all lamps (up to No.15) of the mist indicator are kept on.
When the mist density is lowered to the normal range, press the ENTER key to reset the “HIGH ALARM”.
As for the specifications for external output of the output relay, see Section [9.3 Wiring of the controller].
Original content from www.daihatsu.cc
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