TMCM-342 Manual V1.01
17/26
Copyright © 2008, TRINAMIC Motion Control GmbH & Co. KG
The following hints help avoiding transmission problems in larger systems. Not all hints have to be
followed:
Use power supply filter capacitors of some 1000µF on the base board for each module in order to
take over current spikes. A choke in the positive power supply line will prevent current spikes
from changing the GND potential of the base board, especially when a central power supply is
used.
Optionally use an isolated power supply for the TMCM-Modules (no earth connection on the
power supply, in case the CAN master is not optically decoupled)
Do not supply modules with the same power supply which are mounted in a distance of more
than a few meters.
For modules working on the same power supply (especially the same power supply as the
master) use a straight and thick, low-resistive GND connection.
Use a local +5V regulator on each base-board.
TMCM-342
with driver
V_Motor
(14...50V)
GND
+
C
L
+
Power Supply
keep distance short
TMCM-342
with driver
V_Motor
(14...50V)
GND
+
C
L
keep distance short
ke
ep
d
is
ta
n
ce
b
el
o
w
a
f
ew
m
et
er
s
w
it
h
a
s
in
g
le
p
o
w
er
s
u
p
p
ly
CAN high
CAN low
CAN high
CAN low
Do not supply modules with the
same power supply which are
mounted in a distance of more
than a few meters.
For modules working on the
same power supply (especially
the same power supply as the
master) use a straight and thick,
low-resistive GND connection.
other devices
on CAN bus
(incl. Master)
CAN high
CAN low
V_Motor
GND
+
C
L
CAN_GND
CAN_GND
CAN_GND
Figure 5.13: Power supply requirements for TMC-Modules in a bus system
For large systems, an optically decoupled CAN bus for each number of nodes, e.g. for each base board
with a number of TMCM-34X modules with drivers may make sense, especially when a centralized
power supply is to be used. Be aware that different ground potentials of the CAN sender (e.g. a PC)
and the power supply may damage the modules. Please make sure that the GND lines of the CAN
sender and the module(s) and power supplies are connected by a cable.
