MM-400A
6. Installation and Connections
6-7
ATTENTION
As the figure (A) below, be sure to keep the displacement sensor
perpendicular to the Displacement Detecting Plate. If Displacement Sensor
is slantingly installed like (B) or (C), the life of the sensor becomes shorter.
θ
[
Normal] ［Abnormal］
θ
(A) (C)(B)
［Abnormal］
Displacement
Sensor
Displacement
Detecting
Plate
If the sensor is pressed beyond the range of measurement, it results in
malfunction. Make sure the displacement sensor and the sensor head are
insulated before installed.
The measured value of displacement is minus (-) or plus (+).
When FORWARD is selected for POLARITY in the EXTEND SETUP (3)
screen, the counted value is plus (+) in the direction of retraction of the
movable part of Displacement Sensor and the value is minus (-) in the
extension.
On the other hand, when REVERSE is selected, the counted value is minus (-)
in the direction of retraction of the movable part of Displacement Sensor and
the value is plus (+) in the extension.
3) When using the absolute value in the displacement measurement (selecting
any of ABSOLUTE1 to ABSOLUTE4 for MEASUREMENT MODE in the
EXTEND SETUP (3) screen), perform the following:
• Reset displacement (0 mm position setting) at the reference position for the
absolute measurement.
For example, in the method of performing a reset by applying force without
setting workpieces, the thickness of the workpiece before and after welding
can be measured.
For resetting displacement, refer to Chapter 8, “n-2. SYSTEM SETUP (2)
Screen.”
• When using a KEYENCE’s displacement sensor, displacement at the current
position is read until the MEASUREMENT screen is displayed after the
power supply of the MM-400A is turned on. Do not make the displacement
sensor move.
• When using a Mitutoyo’s, HEIDENHAIN’s, or Ono Sokki’s displacement
sensor, reset displacement after turning on the power supply of the
MM-400A.
Retracting
Extending
Displacement
Detecting Plate
Shaft of
Sensor
Displacement
Sensor
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