Meech 914EX Manual de usuario
Model 914EX
Operating
Manual
Shockless AC Bar
Products shown in this document may be covered by one or more patents, patents applied for
and/or registered designs and/or trade marks. For further information please refer to our Head
Oce or visit www.meech.com.
© Meech Static Eliminators Ltd., 27.10.2017
Contents
Introduction 3
Inspection 3
Operation 4
Installation 5
Maintenance 8
Technical and Construction 9
Special Conditions for Safe Use 10
Fault Finding 11
Repairs and Warranty 15
CE Approval 16
Certication 16
Health and Safety 16
3
Introduction
The Meech Model 914EX has been designed to meet the most arduous of static
elimination problems. The special resistive coupling of its emitter pins renders them
shockless, whilst giving powerful static neutralisation performance. This enables the
Bar to eliminate very high static charges on high speed webs and at longer ranges
than has been previously possible.
Inspection
The Model 914EX Bar was carefully packed at the factory. Nevertheless, we
recommend careful examination of the carton and contents for any damage.
If damage is evident, keep the packing material and immediately notify the carrier
of a possible damage claim. Shipping claims must be made by the consignee to the
delivering carrier.
4
Operation
The typical Meech Model 914EX installation consists of one or more bars connected
to a Meech Model 905 Power Unit.
The Power Unit converts the electrical supply into a high voltage, low amperage
output. This output energy is transferred to the 914EX bar by the HT cable.
The resistively coupled electrodes are energised by the AC voltage from the Power
Unit. The electrodes emit this energy (corona discharge) in the form of a eld of
ionised air. This ionised air supplies ions of both polarities.
Electrostatically charged products which pass through this corona are immediately
neutralised and become static free.
Under test conditions, the Meech Model 914EX has been found to give charge decay
times that are up to eight times faster than standard AC shockless eliminator bars.
5
Installation
The 914EX Bar can be placed between 25mm and 100 mm from the surface to be
neutralised. It is important to ensure that the target surface has free air on both sides
and that earthed metal objects are, where possible, at least 20 mm away from the bar.
These precautions will maximise the unit’s ionisation capability.
Good results can be achieved at distances up to 100mm but as the distance from the
object increases, the speed of charge neutralisation will decrease.
A typical installation distance is 40mm from the target surface. This gives exellent
performance at high web or product speeds, whilest avoiding possible damage from
web breaks or product mis-feeds. Very fast webs may require the bar to be as close
as 25mm to the web.
Correct positioning of the bar(s) is vital to ecient operation. The following diagrams
show the correct installation procedures:
1. The optimal distance from material to be neutralised.
6
Mounting of the bar is by 20mm M4 studs mounted at the rear of the bar.
The chassis of the bar is electrically connected to ground on the power unit via
the exible armoured conduit. However, it is good practice to provide a secondary
grounding through the xing points where practical.
The HT cable and armoured conduit require connection to a Meech model 905 power
unit. Please consult the 905 instruction manual for further instruction.
2. Free space is required on opposite sides of the target material, not a roller or solid
object.
3. Avoid proximity to earthed parts of machinery as this will distort the corona and
reduce its eciency.
7
4. If bars are needed on both sides of the material, they should be staggered.
5. The bars must be earthed for correct operation. If in any doubt run an earth wire
from the bar to the earth stud on the Power Unit.
8
Maintenance
Ionisers require periodic cleaning. During normal operation, dirt will build-up on
the emitter pins and upon the body of the ioniser. This will cause a reduction in
performance.
Typically, weekly cleaning is sucient. However, equipment used in some heavy
contamination areas, such as gravure printing or where plastic fumes are present, may
require daily cleaning. Equally, in a Class 100 area, cleaning may only be required on
a monthly basis. Advanced systems with performance monitoring, e.g 977CM and
904CM, will alert the operator to the need to clean the equipment before performance
drops to an unacceptable level.
Before cleaning, ensure that the equipment is switched o.
Emitter pins can be cleaned very eectively with a brush. A dry toothbrush is ideal.
Ionising bars will need periodic wiping to clean grey deposits from the surface
of the bar. A cloth moistened with a small amount of IPA or methylated spirits is
recommended.
Should you have any additional questions regarding the maintenance of Meech
equipment please contact Meech International directly or you local Meech distributor.
Tabla de contenidos
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