SMAG + MTAG SSI
4.1.3 Connection of the shield
For signals transmission always use shielded cables. The cable shielding must be
connected properly to the metal ring nut of the connector in order to ensure a
good earthing through the frame of the device.
4.1.4 Ground connection
Minimize noise by connecting the shield or the connector housing to ground.
Make sure that ground is not affected by noise. The connection point to ground
can be situated both on the device side and on user’s side. The best solution to
minimize the interference must be carried out by the user.
4.1.5 Zero setting input
The output value can be set to zero (reset) via an external signal issued by a PLC
or other controller device. When the internal microprocessor receives the signal
it resets the output information. This can be very useful for setting the zero
position of both the sensor and the machine. To zero set the encoder position,
connect Zero setting input to +Vdc for 100 µs at least, then discVdc;
normally voltage must be at 0Vdc; zero set must be performed after Counting
direction setting; we suggest performing the zero set when the encoder is in
stop. Connect to 0Vdc if not used.
WARNING
It is necessary to zero set the sensor after having set a new counting direction.
WARNING
After having installed the sensor on the magnetic tape a zero setting operation
is compulsorily required. The zero setting operation is further required every
time either the sensor or the tape is replaced.
NOTE
Please note that, after setting the zero point, the positive counting will be from
0 towards the max. value (see the table below); if you move the axis before the
0 point, the detected value will be the max. number of information – 1 down.
EXAMPLE
Let's suppose we are using the SMAG-GA-5-... model, it is paired with the
MTAG-650-... profile. If you set the 0 along the path, starting from the 0 point,
the output values will be from 0 towards the max. value (114,000, see the table
below) when the measuring system moves according to the arrows shown in
Figure 2; when the system moves back, the value immediately after 0 will be the
max. number of information – 1 (131,071).
...
131.070
131.071
0
1
2
...
114.000
MAN SMAG GA E 1.3.odt
4 – SSI interface
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