K-Tec MT2000 manual Troubleshooting Information, Valid Current Loop Outputs, Possible Symptoms

5. TROUBLESHOOTING INFORMATION

Use a milliamp (mA) meter to measure the output current. When power is applied the output will go to 4.00 mA for at least one (1) second and then to either the measured level or an alarm condition output. If this does not happen the transmitter may not be receiving enough power or the main electronic is defective. Excessive current above 21.00 mA is also an indication of improper power up or defective electronics.

5.1Valid Current Loop Outputs

21.0 mA	If the top board jumper is set to HI ALARM a loss of signal, a
	problem with the configuration or a malfunction will cause the
	output to be set to the alarm condition of 21.0 mA
20.6 mA	When the level increases above the 20.0 mA point the output
	will continue up to 20.6 mA and then latch until the level returns
	below the 20.6 mA level.
4.0 mA to 20.0 mA	Normal output range between 3.8 and 20.6 mA
3.8 mA / (4.0 mA)	When the level decreases below the 4.0 mA point the output will
	continue down to 3.8 mA and then latch until the level returns
	above the 3.8 mA level. [If LRS (Low Range Saturation) is set
	for 4.0 mA, that will be the lowest output, regardless of actual
	level.]
3.6 mA	If the top board jumper is set to LO ALARM a loss of signal,
	problem with the configuration, or a malfunction will cause the
	output to be set to the alarm condition of 3.6 mA

Output spiking up or down will usually result from improper THV or BLK settings. Refer to the initial setup section for details. If a module fails to communicate, verify from the model number that the particular communication option is included.

Note: Signal can be observed using an oscilloscope. Refer to Appendix F for setup procedure.

5.2	Possible Symptoms
	SYMPTOM	ACTION
Output spiking high or raw counts		Extend the Blanking (BLK) in increments of 4
jumping low
		Lower the Threshold
Output spiking low or raw counts		Raise the Threshold
jumping high		Introduce a parallel ground plane
Output mA erratic		Check BLK, THV, GS (section 4.4.2 )
		Check for shorts between electronics (+ and – on back) and ground
Output greater than 21 mA		(case)
		Change the electronics module
		Power unit with an isolated supply
Output too low		Check for proper supply voltage
		Check terminal strip for leakage to cage.
Raw Counts and Output remain		Lower the Threshold
constant but in measuring range
		Check the probe for obstructions
		(continued on next page)
MT2000-0200-1 Rev f (10-2007) DCN0160		19