Parker Hannifin SERVO CONTROLLER OEM6250 - Manual (Page 27)

Chapter 1. Installation 2 1
Lengthening I/O Cables
Bear in mind that lengthening cables increases noise sensitivity. (The maximum length of
cables is ultimately determined by the environment in which the equipment will be used.)
If you lengthen the cables, follow the precautions below to minimize noise problems.
• Use a minimum wire size of 22 AWG.
• Use twisted pair shielded cables and connect the shield to a SHLD terminal on the
OEM6250. Leave the other end of the shield disconnected.
• Do not route I/O signals in the same conduit or wiring trays as high-voltage AC wiring
or motor cables.
Reducing noise on limit inputs (HOM, POS, & NEG), trigger inputs
(TRG-A & TRG-B), drive fault inputs (DFT), and enable input (ENBL). If
you are experiencing noise problems, try adding resistors to reduce noise sensitivity (see
illustration below).
Long Shielded Cable
Add a resistor between the input and the power supply (this will lower
the input impedance and reduce noise sensitivity). Use a value
between 330
W and 2.2K W , depending on noise suppression required.
OPTIONAL
External Power Supply
(5-24VDC)
Output Device,
Switch, etc.
Input Terminal
GND
Shield
OEM6250
Power Supply Options
Digital
Ground
Earth
You must use either the on-board +5V supply
(internally connected via resistor R45) or an
external power supply to power the AUX-P pull-up
resistor (for the HOM, NEG, POS, TRG-A/B, and
ENBL inputs). If you need to use an external
supply, you must remove R45 first; otherwise you
will damage the OEM6250.
Terminal could be:
HOM, NEG, POS,
TRG-A, TRG-B,
or ENBL
AUX-P
5VDC
R45
(0 W )
TH1