PD-1141 Hardware Manual (Rev. 1.04 / 2013-JUL-23)
9
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3.3.1
Power and RS485 Connector
A 5pin single row connector is used for power supply and RS485 serial communication.
5
1
Pin
Label
Direction
Description
1
GND
Power (GND)
System and signal ground
2
VDD
Power (Supply) VDD (+9
V… +28
V)
3
GND
Power (GND)
System and signal ground
4
RS485+
Bidirectional
RS485 interface, diff. signal (non-inverting)
5
RS485-
Bidirectional
RS485 interface, diff. signal (inverting)
Table 3.2 Connector for power supply and RS485
3.3.1.1
Power Supply
For proper operation care has to be taken with regard to power supply concept and design. Due to space
restrictions the PD-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 28V suppressor
diode for over-voltage protection.
C
AUTION
!
Add external power supply capacitors!
It is recommended to connect an electrolytic capacitor of significant size (e.g. 470µF/35V)
to the power supply lines next to the PD-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:
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 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 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.
