Parameter description
protocol
Performance
Menu
4
With
Pr
4.16
set
to
1
or
3
when
in
slave
mode
Pr
5.43
=
8
(P.Slave)
has
no
effect
on
the
drive
thermal
protection.
The
current
limit
applied
at
any
time
depends
on
whether
the
drive
is
motoring
or
regenerating
and
also
on
the
level
of
the
symmetrical
current
limit.
See
Pr
4.16
on
page
64.
This
parameter
displays
the
current
magnitude
(Pr
4.01
{di08,
0.43})
as
a
percentage
of
rated
active
current.
Positive
values
indicate
motoring
and
If
this
parameter
is
set
to
one,
the
drive
calculates
a
torque
reference
from
the
motor
and
load
inertia
(Pr
3.18)
and
the
rate
of
change
of
speed
Parameter
structure
Keypad
and
format
Advanced
parameter
descriptions
Serial
comms
This
assumes
that
the
maximum
allowed
motor
temperature
is
produced
by
1.05
x
Motor
rated
current
and
that
is
the
thermal
filter
of
the
point
in
the
motor
that
reaches
its
maximum
allowed
temperature
first.
is
defined
by
Pr
4.15.
The
estimated
motor
temperature
is
given
by
Pr
4.19
as
a
percentage
of
maximum
temperature.
If
Pr
4.15
has
a
value
between
0.0
and
1.0
the
thermal
filter
is
taken
as
1.0.
When
the
estimated
temperature
reaches
100
%
the
drive
takes
some
action
depending
on
the
setting
of
Pr
4.16.
If
Pr
4.16
is
0,
the
drive
trips
when
the
threshold
is
reached.
If
Pr
4.16
is
1,
the
current
limit
is
reduced
to
100
%
when
the
temperature
is
100
%.
The
current
limit
is
set
back
to
the
user
defined
level
when
the
temperature
falls
below
95
%.
The
time
for
some
action
to
be
taken
by
the
drive
from
cold
with
constant
motor
current
is
given
by:
T
trip
=
-(Pr
4.15)
x
ln(1
-
(1.05
x
Pr
5.07
{SE07,
0.28}
/
Pr
4.01
{di08,
0.43})
2
)
Alternatively
the
thermal
filter
can
be
calculated
from
the
trip
time
with
a
given
current
from:
Pr
4.15
=
-T
trip
/
ln(1
-
(1.05
/
Overload)
2
)
For
example,
if
the
drive
should
trip
after
supplying
150
%
overload
for
60
seconds
then
Pr
4.15
=
-60
/
ln(1
-
(1.05
/
1.50)
2
)
=
89
Each
time
the
rated
current
defined
by
Pr
5.07
{SE07,
0.28}
or
Pr
21.07
(depending
on
the
motor
selected)
is
altered,
the
accumulator
is
reset
to
zero.
NOTE
Pr
4.18
gives
the
limit
level
that
applies
at
any
instant.
negative
values
indicate
regenerating.
reference.
The
torque
reference
is
added
to
the
speed
controller
output
to
provide
inertia
compensation.
This
can
be
used
in
speed
or
torque
control
applications
to
produce
the
torque
required
to
accelerate
or
decelerate
the
load
inertia.
Mentor
MP
Advanced
User
Guide
65
Issue
Number:
4
www.onxcontrol.com
4.18
Overriding
current
limit
Coding
Bit
SP
FI
DE
Txt
VM
DP
ND
RA
NC
NV
PT
US
RW
BU
PS
1
1
1
1
1
1
Range
0
to
TORQUE_PROD_CURRENT_MAX
%
Update
rate
Background
write
4.19
Overload
accumulator
Coding
Bit
SP
FI
DE
Txt
VM
DP
ND
RA
NC
NV
PT
US
RW
BU
PS
1
1
1
1
1
1
Range
0
to
100.0
%
Update
rate
Background
write
4.20
Percentage
load
Coding
Bit
SP
FI
DE
Txt
VM
DP
ND
RA
NC
NV
PT
US
RW
BU
PS
1
1
1
1
1
1
Range
±USER_CURRENT_MAX
%
Update
rate
Background
write
4.22
Inertia
compensation
enable
Coding
Bit
SP
FI
DE
Txt
VM
DP
ND
RA
NC
NV
PT
US
RW
BU
PS
1
1
1
Default
0
Update
rate
Background
read
