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L4540
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The offset value does not disappear when the equipment
is turned off or there is a power failure. This value is
maintained until the operator performs a reset of the
Offset value.
6. Reset Offset button: Push and hold this button for
3 seconds to convert value Z into 0 and A will take
the current value of Z and will add it to the current
value.
A
f
= A
i
+ Z
7. Movement values: There are some values that the
system can show during the movement. These are:
- A (Absolute position): The absolute position is the
position of the cylinder’s stroke sensor taken from
the initial zero. This initial zero is the zero set in
the calibration screen (refer to paragraph
8.6
for
further details).
- Z (Offset variable): Memory variable for a
movement reference.
- L (Load withstood by cylinder): This value shows
the load being withstood by the cylinder.
8.6 Calibration Screen
Figure 23: Calibration Screen Details
When the stroke sensor wire is connected to the
cylinder‘s rod, or if an internal stroke sensor is used,
the system reads the extended length of the sensor
(A value). In that moment, A has a real reading of the
sensor. Refer to Figure 23 for details.
To equalize the stroke sensor position with the rod
position, the user must carry on the calibration of the
cylinder. When the calibration work is performed, the
cylinder will have value A = 0 when retracted.
This screen has similar elements to the Offset screen.
Two buttons are different:
1. Calibration: If the calibration is allowed, based on
the location of the stroke sensor (refer to paragraph
8.3.1 for further details), this button allows calibrating
(equalize the cylinder and the stroke sensor) and
will set the Absolute position of the cylinder (A = 0).
The user must push and hold for 3 seconds this button
to make the value effective.
CAUTION
This step should only be performed with the sensor
connected to the cylinder’s rod fully retracted to
ensure the sensor will be properly calibrated.
2. Reset Calibration button: If something goes wrong
during calibration work, this button allows the
operator to get back to the previous value of the
Absolute position and reset the calibration done.
Figure 24: A value in a general purpose cylinder
8.7 Tare Screen
Figure 25: Tare Screen Details
This screen has similar elements to the Offset screen.
Two buttons are different:
1. Tare: This button allows taring (reducing the
displayed load to zero in order to remove the effect
of lifting beams or other support structures). This
will set the displayed load, L=0. The user must
push and hold for 3 seconds this button to make
the value effective.
2. Reset Tare button: If something goes wrong during
tare work, this button allows the operator to get
back to the previous value of load and reset the tare
done.
A
2
1
2
1
