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ULTRA SERIES STATIONARY SHAFT TRANSDUCER TECHNICAL MANUAL MAN-70430-0 REV AA
10
analog signal from an internal op-amp (operational amplifier) buffer stage. The BLK wire has the signal return and
the WHT wire is the amplifier output. Resistive loads drawing up to 5 mA of current are allowable.
One of the most common ways of reversing the sense of the load cell signal is to invert the mechanical orientation of
the loadcell body itself. If this is impractical, it is possible to interchange the BLK and WHT signal wires, as the
loadcell amplifier and output stage is essentially floating with respect to the 24 VDC supply ground. Note however
that the voltage potential cannot be allowed to float “unbounded”, and that connection to line potential drive circuits is
not permissible (and potentially hazardous).
2.5 Potentiometers Adjustments (If Needed)
The gain and zero adjustments are factory preset but accessible by the user for adjustment if absolutely
necessary. Adjustment holes to access these potentiometers are visible on the side of the housing. Adjustments can be
made by removing the sticker around the amplifier enclosure. Refer to Figure 3 to locate the zero and gain adjustment
hol
es
.
Table C lists these potentiometers, their reference designator, a
n
d a description of their functions. For information on
the correct adjustment tool to use, refer to section 2.5.1 in this document.
Potentiometer
Reference
Designator
Function
GAIN P2
This potentiometer is preset but accessible by the user for adjustment if
absolutely necessary. It provides a 10:1 “vernier” adjustment of the amplifier
gain. It is a multi-turn potentiometer, with clockwise rotation causing an
increase in amplifier gain. When turned fully counter clockwise, the
potentiometer causes the amplifier stage to provide the minimum gain.
ZERO P1
This potentiometer is preset but accessible by the user for adjustment if
absolutely necessary. It provides a zero (offset) adjustment. It is a multi-
turn potentiometer, with clockwise rotation causing a positive shift in the
analog outputs.
Table C Potentiometer Adjustments
2.5.1 CORRECT ADJUSTMENT TOOLS
A small flat-bladed “jeweler’s” screwdriver is required. The overall diameter should be no larger than 0.062” The
thickness of the blade flat should be no greater than 0.012”. Ideally, a non-conductive tool (plastic or ceramic)
provides the safest approach by minimizing the generation of minute metallic shards that are made when a metal blade
accidentally scuffs the aluminum housing.
The Zero is normally adjusted first while the loadcell is in the No-Load condition (i.e. with no tension in the web).
Calibration forces are then applied to the transducer and then the Gain potentiometer adjusted to achieve the desired
scale factor. It is advisable to look for a particular step change between load and no-load conditions and adjust the
step size independent of a particular zero point. Only after the desired scale factor is achieved, is it then best to adjust
the final zero point using the Zero adjustment.
Following adjustment, it is important to seal the adjustment holes for continued protection from contamination. A
small piece of adhesive backed tape can be used to reseal.
- INSTRUCTION MANUAL 1
- REVISION HISTORY 2
- MAN-70430-0 REV AA 4
- TABLE OF CONTENTS 5
- WARRANTY 7
- INTENDED USERS 7
- FURTHER INFORMATION 7
- 1 PRODUCT OVERVIEW 9
- 1.2 Features 10
- 1.4 CE EMC Responsibility 10
- 1.8 Operating Conditions 12
- 1.9 EMC Technical Ratings 12
- 1.10 Emission specifications 12
- 2 PRODUCT COMPONENTS 14
- 2.1 M12 Mating Connector 15
- 2.3 Cabling 16
- NTERFACE WIRING 17
- ORRECT ADJUSTMENT TOOLS 18
- 3 PRODUCT APPLICATION 19
- REV AA 20
- 4 INSTALLATION 22
- AFETY CONSIDERATIONS 22
- OUNTING CONFIGURATIONS 23
- 4.2.4 MOUNTING DIMENSIONS 26
- OLL BALANCE 27
- RITICAL ROLL SPEED 27
- 4.4 Mounting the Transducer 28
- 4.6 Preloading 29
- 4.7 Minimizing Beam Torque 30
- EFORE APPLYING POWER 31
- OWER APPLICATION 31
- 4.15 Final Calibration 35
- 4.17 Cable Glands 37
- 5 TROUBLESHOOTING 38
- 5.1 Transducer Bench Testing 39
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