Yaskawa SGDH Linear Sigma Series - Manual (Page 123)

5.2 Analog Signal Input Timing
5-3
5
5.2 Analog Signal Input Timing
The following figure shows the input timing of the analog signals.
When the cos and sin signals are shifted 180 degrees, the differential signals are the /cos and /sin signals. The
specifications of the cos, /cos, sin, and /sin signals are identical except for the phase.
Input the signals Ref and /Ref so that they shall cross each other as shown in the figure because they are input
into the converter. When they are crossed, the output data will be counted up.
* If the analog signal amplitude declines to about 0.35 V because of differential amplitude, the serial con-
verter outputs an alarm.
„ Precautions
1. Never perform insulation resistance and withstand voltage tests.
2. When analog signals are input to the serial converter unit, noise influence on the analog signals affects
the unit’s ability to output correct position information. The analog cable must be as short as possible
and shielded.
3. Use the device in an environment free from hydrogen sulfide (H
2
S) and other hazardous gases.
4. Do not connect or disconnect the unit while power is being supplied, or the unit may be damaged.
5. When using multiple axes, use a shield cable for each axis. Do not use a shield cable for multiple axes.
Zero Point
Count up direction
cos /cossin/sin
Input voltage range:
1.5 V to 3.5V
Ref /Ref
Input voltage range:
1.5 V to 3.5V
100%
45 q
5 to 75% 5 to 75%
0.2 V min. 0.2 V min.
0.2
VQ
0.6 V
cos
㧔A+㧕
/cos
㧔A-㧕
sin
㧔B+㧕
/sin
㧔B-㧕
/Ref
㧔R-㧕
Ref
㧔R+㧕
IMPORTANT