Emerson 54e pH/ORP instruction manual Troubleshooting Guide, No Power

MODEL 54e pH/ORP		SECTION 8.0
		TROUBLESHOOTING
TABLE 8-3. Troubleshooting Guide
PROBLEM OR CONDITION	PROBABLE CAUSE AND	FOR MORE HELP,
	CORRECTIVE ACTION	REFER TO
Controller completely inoperative	No Power -	Wiring, Section 3.0 and Figure 3-1
	Check power supply at breaker and
	inside controller: 115 V across
	terminals 1 and 2 on TB3.
	Cut-off circuit -
	Check power supply board.	Figure 3-1

Electronics Failure -

Replace the electronics.

Controller operating, but adding chemical above setpoint, or not adding below setpoint,

or not holding setpoint.

Incorrect or Changed Settings -	Software Configuration,
Refer to software configuration	Section 5.0
procedure and verify that control
parameters are correct and entered
properly. Pay special attention
to the TPC settings.
Electronics Failure -	Simulated tests
Try power down and power back	Section 5.4
up to reboot the program. Test
alarm relays.
Replace electronics if necessary.

Inability to standardize pH	Incorrect standardization procedure -	Calibration, Section 4.0
"Zero Offset Err"	If you are trying to adjust the pH reading
	by a large amount, the controller may
	reject your standardization and will
	continue to display the previous value.
	Check that your lab instrument, titrations,
	or chemical standard solutions have
	been used properly and are correct.
	Sensor failure -	Section 8.2
	Simulate sensor in "Preamp
	Troubleshooting".
	Replace sensor if preamp ok.
	Electrode coated -
	Clean electrode as needed.
	(381+ Sensor) Reference chamber
	is contaminated -
	Replace gel-filled solution as instructed
	in 381+ manual
	Defective preamplifier -	Section 8.0
	Check preamplifier as instructed in
	Preamp Troubleshooting procedure
	and replace if defective.
	(381+ Sensor) Bad Reference -
	If trouble still persists, microjunction on
	reference electrode is defective.
	Replace reference electrode.

66 Table 8-3 is continued on the following page