Technical data

Manual
Double Sheet Detector R1000 series E20
Mounting
B0046991 / Rev. 1.6
46
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone [phone] · Fax [phone]
4.3 Mounting of sensors
The reliable function of the Double Sheet Detector depends to a great degree on the correct
mounting of the sensors. The following mounting rules should be followed:
• The sensor must be mounted perpendicular to the sheet and fully contact the sheet surface.
Foreign matter should not obstruct the contact.
• Tilting or air gaps between the sensor and the sheet surface can result in faulty
measurements.
• It is possible to cover the sensor surface with thin Teflon in order to avoid damage to the sheet
metal surface. However, this will reduce the performance and is, therefore, not recommended.
• It is important to set the under gauge threshold of the control unit and analyze the under
gauge signal at the 0-sheet output.
• It is important to set the upper gauge threshold of the control unit and analyze the upper
gauge signal at the 2-sheet output.
• A spring loaded mounting bracket or the installation directly into the vacuum cup is
recommended (see the following sections).
Attention Air gaps can result in faulty measured values. This applies also to
tilting or partial gaps or bowed sheets. Ignoring these factors can
result in unreliable operations.
The E20 can detect unintentional air gaps. The lower limit (“low“) should be used for this purpose.
The lower limit should be adjusted to more than 80%. An air gap causes a decrease of the
measured value. As soon as the measured value falls below the under gauge threshold, then under
gauge is signalled at the 0-sheet output. It is absolutely necessary that the control unit stops the
current operation and issue is a fault signal. Only if this fault condition is eliminated should sheet
processing be allowed to continue.
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