97
Fault
Cause
Remedy
VFD
Short
Circuit
(C)
A
VFD
short
circuit
fault
occurs
when
there
is
an
internal
or
external
short
circuit
on
the
VFD
output
circuit.
This
is
an
instantaneous
fault.
Check
if
power
line
wiring
is
connected
to
VFD
motor
terminals
Check
that
there
are
no
shorts
visible
on
the
output
circuit
of
the
VFD
Disconnect
the
motor
wires
at
the
VFD,
disable
the
no
motor
protection
in
PROTECTION
‐
03,
and
run
the
VFD
with
no
load.
If
problem
persists,
then
the
VFD
output
is
shorted
internally.
Consider
replacing
the
VFD
and
don’t
forget
to
check
the
motor
circuit
also
for
shorts.
This
may
have
caused
the
damage
and
could
possibly
damage
a
newly
installed
VFD
if
not
corrected.
Check
that
there
are
no
shorts
in
the
wires
running
between
your
VFD
and
the
motor
Over
Voltage
(L)
A
VFD
over
voltage
fault
occurs
when
the
VFD’s
internal
DC
bus
voltage
limit
is
exceeded.
This
is
an
instantaneous
fault.
Check
that
the
measured
line
voltage
matches
the
VFD
rated
voltage
Check
that
the
DEC
time
is
adequately
high
to
allow
for
slow
ramp
‐
down
of
the
motor
load.
Decelerating
too
quickly
can
create
harmful
regenerative
voltage.
For
fans
and
other
high
‐
inertia
applications,
it’s
best
to
use
the
“coast”
stopping
mode
selectable
in
PRIMARY
‐
30
to
allow
for
gradual
motor
slowing
For
very
high
‐
inertia
loads,
consider
installing
a
dynamic
braking
unit
and
braking
resistor
to
absorb
any
excess
regenerative
voltage
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Страница 15: ...15 CHAPTER 3 SPECIFICATIONS CHAPTER 3 SPECIFICATIONS 3 1 Standalone VFD Ratings 3 2 VFD Smart Bypass Ratings...
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