TMCM-1141 Hardware Manual (Rev. 1.06 / 2015-JAN-09)
8
3.2.1 Power and RS485 Connector
A 5pin single row connector is used for power supply and RS485 serial communication.
Pin
Label
GND
VDD
GND
RS485+
RS485-
Direction
Power (GND)
Power (Supply) VDD (+9 V… +28 V)
Power (GND)
Bidirectional
Bidirectional
Description
System and signal ground
1
2
3
4
5
1
5
System and signal ground
RS485 interface, diff. signal (non-inverting)
RS485 interface, diff. signal (inverting)
Table 3.2 Connector for power supply and RS485
3.2.1.1 Power Supply
For proper operation care has to be taken with regard to power supply concept and design. Due to space
restrictions the TMCM-1141 includes about 40µF/35V of supply filter capacitors. These are ceramic
capacitors which have been selected for high reliability and long life time. The module includes a 24V
suppressor diode for over-voltage protection.
CAUTION!
Add external power supply capacitors!
It is recommended to connect an electrolytic capacitor of significant size (e.g. 1000µF/35V)
to the power supply lines next to the TMCM-1141 especially if the distance to the power
supply is large (i.e. more than 2-3m)! In larger systems a zener diode circuitry might be
required in order to limit the maximum voltage when the motor is operated at high
velocities.
Rule of thumb for size of electrolytic capacitor: ꢀ ꢁꢂꢂꢂ ꢃꢄ ꢆ ꢇꢈꢉꢊꢊꢋꢌ
ꢅ
In addition to power stabilization (buffer) and filtering this added capacitor will also
reduce any voltage spikes which might otherwise occur from a combination of high
inductance power supply wires and the ceramic capacitors. In addition it will limit slew-
rate of power supply voltage at the module. The low ESR of ceramic-only filter capacitors
may cause stability problems with some switching power supplies.
Keep the power supply voltage below the upper limit of 28V!
Otherwise the driver electronics will seriously be damaged! Especially, when the selected
operating voltage is near the upper limit a regulated power supply is highly
recommended. Please see also chapter 7 (operating values).
There is no reverse polarity protection!
The module will short any reversed supply voltage due to internal diodes of the driver
transistors.
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