Mounting Of Sensors - Roland udk20 Manual

Mounting
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).
The UDK20 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.
Pos: 28 /Doppelblech/Sensoren/Allgemein/Checkliste zur Montage kontaktierender Sensoren @ 1\mod_1223292024109_501.doc @ 7533 @ 3 @ 1
4.3.1 Checklist for Mounting of contacting Sensors
In the interest of longest lifetime and operational security the following items should be observed
when mounting contacting sensors and checked in regular intervals.
Point of attention
Cable type
Cable routing
Plug
38
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
Double Sheet Detector R1000 series UDK20
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.
Manual
Possible influences
1 Use only the recommended cable with
highest flexibility and durability.
2 Avoid any tension of the cable. Route
the cable with enough clearance.
3 Special care has to be taken to the route
of cable in front of sensor plug, if a
flexible sensor bracket is used. The
cable should never have a bend close to
the plug. Also the meander of the cable
has to be symmetrically to the axis of
the plug, see enclosed sketch.
4 Correctly tighten the arresting ring of the
plug. This avoids too strong wear of
contacts. If possible choose a sensor
with fixed cable instead.
B0048991 / Rev. 1.3
Checked