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C.2 Powering the 6415 from a Regulated Supply
Certain precautions should be taken when powering the 6415
drive from a regulated power supply. The 6415's bipolar chopper
output stage draws current from the DC supply in the form of
pulses with fast rise and fall times. This may be a problem for
some regulated supplies designed to drive loads having relatively
constant or slowly varying current drain. If a regulated supply is
used and problems are encountered, a 470uf capacitor should be
placed across the DC+ and DC-lines between the power supply
and 6415. Ideally this capacitor is located close to the 6415 drive
but it can be located near the power supply and connected to the
6415 with a twisted pair no longer than 3 feet in length. The
capacitor should have a 20KHz ripple current rating of at least the
6415's current setting and a voltage rating of 1.3 times the
nominal bus voltage.
A second precaution involves regenerated power (see section
C.1.5). Regulated supplies are usually not designed to absorb
power. This might cause their output voltage to rise during
regeneration and lead to power supply and/or 6415 damage. The
same considerations and solutions described in section C.1.5
apply.
C - 10
6415 Installation & Hardware Reference Manual - Rev E
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