S.B.C. Elettronica S.p.A. - Engineering Division
HPDxxN – High Power User’s Manual
19
If the frequency/direction mode configuration is adopted, channel A is dedicated to frequency
while channel B handles direction. Frequently, a 24V interface is preferred to an RS-422 serial port.
The conversion can be implemented on the external connector by following this wiring diagram:
1
2
3
4
5
6
7
8
9
+24V=
X6
DIR
PULSES
3K9
3K9
470
470
2K2
2K2
HPD N connection with digital locking
1
2
3
4
7
X6 (HPD)
X6 (HPD)
master
A
A
B
B
GND
1
2
3
4
7
X7 (HPD)
see text for burden resistors
The example in the figure shows the connection between two HPD N drives in digital lock with a
master, but this configuration can be extended to several drives connected in series. 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 X6. 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 RS-422; it is therefore possible
to connect a maximum of 10 slave HPDNs.
If the master is an HPD N drive, then up to 32 units can be connected in digital lock mode using
the same simulated encoder signal (RS-422 standard).
For the relative programming of the HPD N, consult the
Digital locking
chapter in this manual.
2.11 Encoder emulation
On connector X7 there are signals of encoder emulation phase A, phase B and phase C
(reference zero). The signals are RS-422 type. For the relative programming of pulses per revolution
consult the
Basic parameters
chapter in this manual, bit b42.0, b42.1 and b42.2 (default = 1024
pulses/revolution).
