Omega DPF76, DPF78, DPF75 manual Troubleshooting Guide, Problem Possible Causes Solutions

TROUBLESHOOTING GUIDE

PROBLEM	POSSIBLE CAUSES	SOLUTIONS
Power is applied to unit but the display	1. AC or DC power wiring is incorrect.	1. Recheck power wiring
does not light.

Unit works, but occasionally the display freezes or skips counts.

1.Line noise is affecting the processor due to a current spike or surge.

1.Use a different power supply or install a surge suppressor.

Input signal is connected but the unit does not count or display rate.

1.Input wiring is incorrect.

2.Scale factors are incorrect.

3.Transmitting device is defective.

4.Wrong debounce filtering selected.

5.Unit is defective.

1.Recheck input wiring.

2.Recheck scale factors and factor calculations.

3.Replace transmitting device.

4.Recheck debounce filtering selection "hi cps" or "lo cps".

5.To confirm set scale factors at one and connect a wire to pin #7 and touch it to pin # 5 (input A). Each time pin #5 is touched counter A should count once. If not, call OMEGA. (this test will not

work on units with quadrature input)

Rate is displaying: r FFFFF.

1.The unit is trying to display a number which it can't (too small or too large).

2.Line noise affected unit on power up.

1.Check scaling factor, if it is correct, lower the number of significant figures.

2.Reprogram the unit, be sure to enter a decimal (enter one and remove it if a decimal is not desired).

Relays are not activating properly.	1.	Wrong relay duration.	1.	Recheck programmed relay duration.
	2.	Relay set for wrong activation	2.	Recheck programmed relay
		i.e. count instead of rate.		activation mode.

Counter resets before reaching 999999. 1. Relay duration is set at a value other than 00.0. This causes the counter to auto-reset at the preset.

1.If relay outputs are not being used, set the relays for rate (DPF75 only).

2.Set the relay durations to 00.0.

Various menu items are not being displayed.

1.The menu flow chart and the setup steps show the setup for the units with rate and total (DPF75). When using a unit which has only count (DPF76) or only rate (DPF78) several menu items will not be displayed.

1.The menu items which do not appear are not used for the models without the ratemeter (DPF76) or without the counter (DPF78). Therefore, disregard any menu items which appear on the flowchart and setup steps, but do not appear on the unit's display.

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