E6580516
,-
,-,
1_1
,-
•
,-
,-
(Protection Parameters)
,-,,
,-,
1_11_ I I
Electronic
thermal
protection
(2)
Related parameters
IOL n I
OL
selection
IS
t [
ti
Stall protection
IS
t L : I Stall protection level
The
OL selection parameter IOL nl can be set as follows.
,..,,
,-,
setting value Function
1
..
11
..
I I
n
Standard
w
+
'
Soft-stall ON
'
+2
Motor overload ( 0 L n t
) trip OFF
Note) When 3 is selected, both the + I and + 2 functions are enabled.
* The motor overload trip can be enabled/disabled with
IO
L n I , but the inverter overload trip is always
enabled.
Soft-stall function:
When the inverter detects an overload, the output frequency
will automatically be lowered before the
motor
overload trips (
OL
nt
).
The load current will stabilize
at
the reduced frequency, and operation
will continue without tripping.
This function is
applicable to variable torque loads such as fans, pumps and blowers, which exhibit the
characteristic that when the operating speed decreases, the
load current also decreases.
* Do not use soft-stall on constant torque loads (loads with a contact load current regardless of speed).
Inverter overload protection curve (For 75kW and smaller)
t
Time
[SJ
.
120
--------------------~----
: This protection curve cannot be changed or turned off
with parameter settings. This is built-in to protect the
inverter unit.
If the inverter overload trip ( O L :
,-,
)
activates, lower
IS
t L : I
in
[,
,-
.F'
,- (stall
protection level (current limit level adjustment)),and
increase the acceleration time (
IH
[ [
:I
or
IF:
cc
c'I
) to decrease the chances of this occuring.
100%:
Inverter
rated
current
0.5
...............................................
:
...............
P'
................
...
0
110% 150%
215%
Output
current
- 78 -
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