Yokogawa 414 Batch Controller - Manual (Page 55)

Trouble Shooting 53
Not counting.
If the Batcher does not count with the flowmeter connected and flow
passing through it, first check the connections and then ensure the DIL
switches (Model 414D only) on the rear of the instrument are set as per
Section 6.
It is possible to manually test the input circuit of the Batcher by setting the
input configuration for a Reed Switch (see Section 6) and pulsing across the
signal (+) and (-) with a wire link. When doing this, the scaling factor
should be set to 1 and the resolution to whole numbers.
Counting erratically.
This can be caused by two factors:
- setting the input circuit incorrectly,
- lack of shielding on the input.
Shield the input signal with the shield earthed at the Batch Controller only.
Instrument acting erratically.
Erratic operation can be the result of severe electrical interference.
Considerable attention has been given to designing the Batch Controller to
withstand electrical interference.
However, in extreme cases, loads may be encountered which are
exceptionally inductive and may require additional protection. One
measure is to use an RC Suppression Network as described in Section 7.
Another remedy for this problem is to use an isolating relay to switch the
load, and use the Batcher to drive the isolating relay. The isolating relay
should be mounted away from the Batcher and from signal wiring.