Table of Contents
Advertisement
ROLAND
Rev. 1.0
4.3 Sensor mounting
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 contact fully 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 thus not recommended.
•
The sensor can be mounted in any direction, it can be installed above or below the sheet.
•
The under-gauge threshold of the control unit must be correctly adjusted and the under-gauge signal
at the 0-sheet output must be analyzed.
•
The over-gauge threshold of the control unit must be correctly adjusted and the over-gauge signal
at the 0-sheet output must be analyzed.
•
It is recommended to mount the sensor in a spring loaded mounting bracket or directly into the
vacuum cup (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 UDK20 can detect unintentional air gaps. The lower limit (LL) should be used for this purpose. LL should
be adjusted to more than 80 percent. 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 signaled 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.
ROLAND ELECTRONIC GMBH · Otto-Maurer-Str. 17 · D-75210 Keltern · Telefon (0049) (07236) 9392-0 · Telefax (0049) (07236) 9392-33
OPERATING INSTRUCTIONS
DOUBLE SHEET DETECTOR R1000 UDK20
All dimensions in mm.
Length tolerances ± 0,8mm,
all other tolerances ±0.2 mm
Picture: Dimensions of the sensor PW42AGS
Page 35
Advertisement
Table of Contents
