Installation and Configuration
Ndrive HP 10/20/30 Manual
2-24
www.aerotech.com
Figure 2-22.
FireWire Daisy Chain
Before connecting any device to the FireWire bus, the
device should be powered up and tested independently to
prevent damaging linked equipment.
Ndrive HPs, HLs, CPs, MPs, Nservos, Nsteps and Npaqs
should always have their FireWire cables connected in a
star configuration to minimize the FireWire cable lengths
(see Figure 2-21).
2.9.1. I/O and Signal Wiring Requirements
The I/O, communication, and encoder feedback connections are typically very low power
connections. Wire and connectors used for signal wiring should be rated for at least 30 V
and have a current capacity of at least 0.25 Amp. Wires and connectors used for low
voltage power connections such as +5V should have a current capacity of at least 1 Amp
(encoder fe5V supply may require 0.6 Amps in some applications). In some
applications, especially when there are significant wire distances, a larger wire size may
be required to reduce the voltage drop that occurs along the wire. This increase may be
necessary in order to keep the voltage within a specified range at a remote point.
When signal wiring is in close proximity to wiring operating at voltages above 60 Volts
the insulation rating of the signal wiring will also need to be rated for the higher voltage.
Signal wiring should have a voltage rating of at least 300 Volts when in proximity to AC
power or motor power wiring.
Signal shielding is very important and the wiring should be
physically isolated from motor, AC power and all other
power wiring.
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