
0.1: 0.1 A power supply current of the
manual pulse generator
R: Resistance per unit length of the
wire (W/m)
m: Number of wires connected in
each 0 V and 5 V line
L: Wire length (m)
B–62073E/04
7. CONNECTION TO CNC PERIPHERALS
239
(1)Cable connection for the manual pulse generator
The power supply to the manual pulse generator is 5 VDC, same as for
the pulse coder. It is therefore necessary to prevent cable resistance
from causing the supply voltage to drop more than 0.2 V (total for both
the 0 V and 5 V lines).
This is written as:
0.2
+
u
0.1 R 2L
m
This can be converted to the
following equation:
L
+
t
m
R
When A66L–0001–0286 cable is used:
This cable, developed for the FS15–B/16/18 pulse coder interface,
consists of three pairs of signal wires and six power line wires
(20/0.18, 0.0394 W/m). When three wires of this cable are used for 0
V and another three for 5 V, the allowable cable length is calculated
as follows:
L
+
t
3
0.0394
+ 76.75 [m]
This means that a power supply with a cable length of 50 m is still
within specifications.