Optidrive
ODV
‐
2
User
Guide
Revision
1.00
www.invertek.co.uk
52
point).
For
dynamic
systems
which
respond
quickly,
the
value
will
need
to
be
shorter.
Slow
response
systems,
such
as
temperature
control
applications
will
require
a
correspondingly
longer
time
setting.
P3
‐
03
Differential
Time
Constant:
Range
0.00
to
1.00,
Default
0.00
The
differential
time
constant
is
also
a
time
based
function,
this
time
modifying
the
PID
output
based
on
changes
in
the
Set
‐
point.
In
most
applications,
leaving
the
setting
of
P3
‐
03
at
zero
will
give
good
results.
The
user
has
to
adjust
the
PID
control
parameters
(P
‐
gain,
I
‐
gain
and
D
‐
gain)
in
P3
‐
01,
P3
‐
02
and
P3
‐
03
respectively
to
get
the
best
control
performance.
The
values
will
vary
dependent
on
system
inertia
and
the
time
constant
(rate
of
change)
of
the
system
being
controlled
.
14.2.7.
PID
Sleep
and
Wake
Functions
The
Optidrive
HVAC
can
be
programmed
to
disable
its
output
when
running
in
PID
mode
when
the
speed
output
to
the
motor
falls
below
a
programmed
value.
This
is
referred
to
a
Sleep
or
standby
mode.
Generally
fan
and
pump
applications
perform
little
useful
work
at
the
lower
end
of
the
speed
range
and
the
sleep
function
allows
the
drive
to
save
energy
during
periods
of
low
system
efficiency
by
shutting
off
the
output
to
the
motor.
The
level
for
sleep
mode
is
programmed
in
parameter
P3
‐
14.
A
time
period
is
also
applied
to
the
sleep
function
such
that
the
sleep
function
must
remain
below
the
value
set
in
P3
‐
14
for
the
period
programmed
in
P2
‐
27
(standby
mode
timer)
before
the
sleep
function
is
activated.
Sleep
mode
is
disabled
if
P2
‐
27
=
0.
Once
the
Optidrive
HVAC
enters
into
sleep
mode
a
separate
wake
up
mode
can
be
applied
for
the
drive.
The
wake
mode
level
is
used
to
trigger
the
drive
returning
out
of
sleep
mode
to
normal
operation.
Setting
different
thresholds
for
the
sleep
and
wake
levels
allows
boundaries
to
be
set
that
stop
the
drive
continuous
entering
in
and
out
of
sleep
mode
and
the
settings
to
be
optimised
to
maximise
efficiency.
Wake
up
level
is
set
in
parameter
P3
‐
13
–
PID
feedback
wake
up
level
and
is
set
as
a
percentage
of
the
feedback
signal
such
that
when
the
feedback
signal
reaches
a
specified
level
the
drive
is
triggered
out
of
sleep
mode
and
the
PID
controller
re
‐
enabled.
14.2.8.
PID
Boost
Cycle
on
Sleep
and
Wake
The
Optidrive
HVAC
can
be
programmed
to
execute
a
pre
‐
defined
boost
cycle
on
entering
or
exiting
sleep
mode.
This
feature
could
be
used
to
boost
pump
pressure
prior
to
drive
entering
sleep
mode
so
the
drive
is
able
to
maintain
sleep
mode
status
for
a
greater
period
(prevent
frequent
switching
in
and
out
of
switch
mode.
The
boost
on
wake
could
be
used
to
execute
a
cycle
that
quickly
returns
the
system
to
normal
operating
status
prior
to
entering
back
into
PID
control.
The
pump
wake
up
boost
is
enabled
when
the
speed
hold
time
on
enable
P6
‐
11
is
set
to
a
value
other
than
0.
P6
‐
11
contains
the
time
that
the
drive
will
run
the
boost
function
on
wake.
The
speed
for
the
boost
function
on
wake
is
set
in
preset
speed
7
(P2
‐
07).
The
timing
diagram
below
gives
an
example
of
the
set
‐
up
and
motion
profile
for
the
Boost
on
wake
function.
The
pump
sleep
boost
is
enabled
when
the
speed
hold
time
on
disable
P6
‐
12
is
set
to
a
value
other
than
0.
P6
‐
12
contains
the
time
that
the
drive
will
run
the
boost
function
before
entering
sleep
mode.
The
speed
for
the
boost
function
on
sleep
is
set
in
preset
speed
8
(P2
‐
08).
The
timing
diagram
below
gives
an
example
of
the
set
‐
up
and
motion
profile
for
the
Boost
on
sleep
function.
