Magnetek DSD 412 - Figure 20: Analog Signal Ground Noise; Figure 21: Serial Link Connections

DRIVE SETUP
79
Avoiding Analog Signal Ground Noise
Figure 20: Analog Signal Ground Noise
Serial Link Connections
Figure 21: Serial Link Connections
RefOut +
RefOut -
Common
GND
MAGNETEK
DSD-412
DC DRIVE
CAR
CONTROLLER
PLC
Differential
Input
Circuit
Common
Vnoise
TB1
(68) +
(63) -
(66,70) com.
(69) shld
(44 OR 43)
(TB11) GND
Twisted & Shielded
N.C.
at PLC end
Proper connections.
Noise current does not flow through signal wires or shield.
Common mode voltage noise is rejected at differential reciever.
1
6
2
7
3
8
4
9
5
+5V
CIRCUIT
COMMON
RX+
RX-
TX+
TX-
RS-422
J1
DB-9
1
2
3
4
5
6
J2
RJ-12
TXD
RXD
+5V
CIRCUIT
COMMON
RS-232