User Manual

PD-1161 V1.0 Hardware Manual (Rev. 1.15 / 2013-JUL-23) 9
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3.2.1 Interface and Power Supply Connector
Pin
Label
Description
1
GND
Module and signal ground
2
VCC
10… 30V DC power supply / nom. 24V DC
3
RS485A+
RS485 non-inverted bus signal
4
RS485B-
RS485 inverted bus signal
5
RS232_TxD
RS232 transmit data from module
6
RS232_RxD
RS232 receive data to module
Table 3.1 Connector for power supply and interfaces
3.2.1.1 Power Supply
When using supply voltages near the upper limit, a regulated power supply is mandatory. The power
supply should be designed in a way, that it supplies the nominal motor voltage at the desired maximum
motor power.
To ensure reliable operation of the unit, the power supply has to have a sufficient output capacitor and
the supply cables should have a low resistance, so that the chopper operation does not lead to an
increased power supply ripple directly at the unit. Power supply ripple due to the chopper operation
should be kept at a maximum of a few 100mV.
HINTS FOR POWER SUPPLY CABLES
- Keep power supply cables as short as possible.
- Use large diameters for power supply cables.
CAUTION!
Add external power supply capacitors!
It is recommended to connect an electrolytic capacitor of significant size (2200µF or larger
recommended) to the power supply lines next to the TMCM-1161 especially if the distance
to the power supply is large (i.e. more than 2-3m)!
Rule of thumb for size of electrolytic capacitor:   


 

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.
Do not connect or disconnect motor during operation!
Motor cable and motor inductivity might lead to voltage spikes when the motor is
disconnected / connected while energized. These voltage spikes might exceed voltage
limits of the driver MOSFETs and might permanently damage them. Therefore, always
disconnect power supply before connecting / disconnecting the motor.
Keep the power supply voltage below the upper limit of 30V!
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 6 (operating values).
There is no reverse polarity protection!
The module will short any reversed supply voltage due to internal diodes of the driver
transistors.