18
ELD2-RS70** User Manual
3.3.3 Pulse Input Interface
270R
DIR+
DIR-
PUL+
PUL-
270R
Driver side
Figure 3-6 Pulse Input Interface Differential Drive Mode
Figure3-7 Pulse Input Interface Single Terminal Drive Mode
(1)
In order to transmit pulse data properly , we recommend using the differential drive mode.
(2)
The differential drive mode, AM26LS31, MC3487 or similar RS422 line drive.
(3)
Using of single-ended drive will cause reduction of the operation frequency.
(4)
The user provide external power supply for single-ended drive. However, if current polarity
connect reversely, servo driver is damaged.
(5)
The form of pulse input is the following form 3.7 below, while the arrows indicates the count .
Table 3.7 Pulse Input Form
Pulse command form
CCW
CW
Parameter setting value
Pulse symbol
PUL
DIR
Pulse + direction
The form of pulse input timing parameter is the following form 3.8 below. The 4 times pulse
frequency ≤ 500kH if 2-phase input form is used.
Table 3.8 the parameters of pulse input time sequence
pa ra meter
Different ia l drive input
Single -en ded drive input
t
ck
>
2μs
>
5μs
t
h
>
1μs
>
2.5μs
t
l
>
1μs
>
2.5μs
t
rh
<
0.2μs
<
0.3μs
t
rl
<
0.2μs
<
0.3μs
t
s
>
1μs
>
2.5μs
t
qck
>
8μs
>
10μs