Parker LVD1 - Page 22

Parker Hannifin S.p.A. - Divisione S.B.C. LVD User’s Manual
22
7
1
0V
2
3
4
X5
8
6
5
9
LVD
A
A
B
B
In the case of parallel connections to more than one LVD, connections to pins 9, 5, 6, and
8, must be made only on the last drive in the group.
If the frequency/direction mode is adopted, channel A is dedicated to frequency while
channel B is dedicated to direction. A 24V= interface is often more convenient than the RS-
422. If the CLOCK and DIR signals are push-pull type, the interface between the two
standards can be performed easily directly on the external connector using the configuration
shown in the following diagram:
1
2
3
4
5
6
7
8
9
+24V=
X5
DIR
CLOCK
3K9
3K9
470 470
2K2
2K2
Connecting the LVD drive in digital locking mode
1
2
3
4
7
X5 (LVD)X5 (LVD)master
A
A
B
B
GND
1
2
3
4
7
X4 (LVD)
See text for line end (burden) resistor values
The above example shows the connection between two LVDs in digital lock with a master,
although it can be easily extended to several drives provided series connection is adopted. On
the final drive in the series connect the burden resistors by jumpering pin 1 with pin 9, pin 2
with pin 5, pin 3 with pin 6 and pin 4 with pin 8 on connector X5. The master can be an
externally fed encoder or the simulated encoder output on another drive.
The signal from the master encoder must be differential type 5V RS422; it is therefore
possible to connect a maximum of 10 slave LVDs. If the master is an LVD drive, then up to 32