Pulse In 24 V; Digital Field Plate / Gmr - SIEB & MEYER SD2S Hardware Description

8.4.3

PULSE IN 24 V

Fig. 14: PULSE IN 24 V
Note
A pulse generator for 5 V is to be connected to X17 (pin 25), see connection example
chapter 8.6.11 "PULSE IN 5 V", page
8.4.4

Digital field plate / GMR

The switching thresholds of the converter input IN8 are 5.4 V for active-low signals
and 5.9 V for active-high signals. Therefore the switching thresholds of the used sen-
sor must be adapted to the input by offsetting the middle voltage.
Fig. 15: Digital field plate / GMR
[*] The resistors R
Sample calculation of the resistors R
The resistance is calculated by means of the spindle data.
Specifications taken from the data sheet of the spindle manufacturer:
▶
Sensor off: 4 mA (signal is not available)
▶
Sensor on: 8 mA (signal is available)
▶
Voltage U: 3 V (amplitude with 24 V supply and a resistance (R
The resistance Rinternal (4.4 kΩ) results from the circuit topology and must be included
in the calculation.
The spindle data make the following voltage levels at the input:
Sensor off:
Drive System SD2S - Hardware Description 0362x49xx / 0362129xx
64.
and R depend on the used sensor.
1 2
1
I ´ = 4 mA ´
( (
1 R
1 R
+
ext
int
2
Connection Examples
and R
1 2
1
(
1 680 W
+ 1 4400 W
) of 680 Ω)
2
= 2.36 V
(
51