5 troubleshooting, Roubleshooting – Cleveland Motion Controls ULTRA ISC SERIES SLIM CELL TRANSDUCER REV AA User Manual

Page 40

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U

LTRA

ISC

S

ERIES

S

LIM

C

ELL

T

RANSDUCER

MAN-70434-0

R

EV

AA

5 T

ROUBLESHOOTING

Do no let safety be an afterthought! Before installing, servicing or calibrating review and follow applicable policies and
procedures to ensure worker safety. Machinery must be in a safe state and be aware of any additional hazards that
can arise when installing and calibrating higher force transducers.

The Table F provides you with a list of typical issues that you may encounter and possible solutions:

If you are having this issue:

Then:

No Output Signal

Check to be sure that all connections have been made completely and properly.

Inspect the connecting cables for crimps or cuts.

Verify that the appropriate 24VDC voltage supply is being applied to the ISC tension
transducer. Check fuses in supply.

Disconnect the ISC transducer output wires from the tension controller’s input terminals (to
eliminate any potential for accidental loading) and check the amplified output signal using a
voltage meter.

Low Output Signal

The ISC transducer may have too large a maximum working force (MWF) in relation to the
force to be sensed, or the wrap angle may be insufficient and is not able to generate an
optimum resultant force on the transducer.
Or
The transducer may be improperly orientated such that the transducer’s axis of sensitivity is
not aligned with the bisector of the wrap angle.
Or,
Check that the signals from each ISC transducer will combine additively. Otherwise, the two
signals will work against each other, and only minute differences between signals appear.

Wrong Polarity of Output Signal

Transducers may have been incorrectly oriented. Refer to section 4.6 for proper load
direction. Alternately, change the signal sense by interchanging the white and black
transducer leads into the tension controller. Compliment (invert) signal sense in controller
software.

Excessive Output Signal with
Minimal or No Load

There may be a high degree of misalignment of the transducers causing a severe pre-load.
Or
The sensing guide roll assembly may be excessively heavy. The sensing guide roll should
not weigh more than ½ the maximum working force of the transducers in most cases.
Or
The transducer may have too small a maximum working force for the application. Replace
with a higher maximum working force transducer or decrease the web wrap angle.
Also,
Check cables and connectors for intended connections using an ohm-meter or continuity
checker. Inspect not only for continuity where expected, but also disconnect connectors and
check for unintended resistances (shorts) between conductors.

Inspect the transducers for mechanical reasons why there is a reported overload.
Possibilities include, debris wedged in the transducer’s shaft seal area, a roll shaft bottoming
inside the transducer body or a transducer otherwise poorly mounted.

Poor Linearity

Check for mechanical reasons such as rubbing or binding that interferes with the force being
properly transmitted to the load cell.
Or
Your calibration efforts may have been conducted while either the transducer or the amplifier
was in a non-linear mode (i.e. under the effects clipping or saturation). Try and recalibrate
the amplifier using a lower force.
To determine whether the clipping is being caused by the transducer or the amplifier, apply
a series of intermediate forces and record the tension signal.

Table F Troubleshooting Guidelines

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AGE

40

OF

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