Omega DPF78 SERIES, User Manual

20

PROBLEM

SOLUTIONS

POSSIBLE CAUSES

TROUBLESHOOTING GUIDE

Power is applied to unit but the display
does not light.

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

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

Rate is displaying: r FFFFF.

Relays are not activating properly.

Counter resets before reaching 999999.

Various menu items are not being
displayed.

1. AC or DC power wiring is incorrect.

1. Line noise is affecting the processor

due to a current spike or surge.

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. 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. Wrong relay duration.
2. Relay set for wrong activation

i.e. count instead of rate.

1. Relay duration is set at a value other

than 00.0.  This causes the counter
to auto-reset at the preset.

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. Recheck power wiring

1. Use a different power supply or

install a surge suppressor.

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)

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).

1. Recheck programmed relay duration.
2. Recheck programmed relay

activation mode.

1. If relay outputs are not being used,

set the relays for rate (DPF75 only).

2. Set the relay durations to 00.0.

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.