28
Parameter
Indica-
tion
Name Outline
Factory
Setting
<EC
Version>
21
Stall prevention
function selection
0
22
Stall prevention
operation level
Stall prevention is a function designed to
suspend a frequency increase during
acceleration or suspend a frequency decrease
during deceleration if the preset current (0 to
200%) is exceeded, in order to prevent an
overcurrent alarm.
Pr. 21 allows you to select whether to use stall
prevention or not according to the
acceleration/deceleration status.
If the Pr. 22 value is set to 170% or more,
torque will not be developed.
In that case, set "1" in Pr. 21.
150%
23
Stall prevention
operation level
compensation
factor at double
speed
Used to reduce the stall prevention level at or
above the base frequency.
Setting other than "- - -" specifies the current level
at 120Hz which is lower than the Pr. 22 value of
the stall prevention level at base frequency.
0 to 200%, - - -
- - -
24
Multi-speed setting
(speed 4)
- - -
25
Multi-speed setting
(speed 5)
- - -
26
Multi-speed setting
(speed 6)
- - -
27
Multi-speed setting
(speed 7)
Setting other than "- - -" specifies speeds 4 to 7.
By combining ON and OFF of the contact
signals (RH, RM, RL signals), the running
speed can be changed step-by-step.
RH RM RL
ON ON
ON
ONONON
ON ON
ON
Speed 4
Speed 5
Speed 6
Speed 7
OFF
OFF
OFF
0 to 120Hz, - - -
- - -
28
Stall prevention
operation reduction
starting frequency
You can reduce the stall prevention level in the
high frequency range.
0 to 120Hz
60Hz
<50Hz>
29
Acceleration/
deceleration pattern
Used to determine the frequency changing
pattern at acceleration/deceleration.
0: Linear acceleration/deceleration
1: S-pattern acceleration/deceleration A
(e.g. machine tool spindle applications)
2: S-pattern acceleration/deceleration B
(e.g. load collapse preventing applications
for conveyors and so on)
0
For parameter 30, refer to the basic function parameters.
31 Frequency jump 1A - - -
32 Frequency jump 1B - - -
33 Frequency jump 2A - - -
34 Frequency jump 2B - - -
35 Frequency jump 3A - - -
36 Frequency jump 3B
Set the frequency range you want to evade
during constant-speed operation to avoid
resonance with a machine.
0 to 120Hz, - - -
- - -
37 Speed display
You can convert the frequency monitor/set
frequency of the operation panel into the load
speed and display it. Setting 0 shows the output
frequency, and setting 0.1 to 999 shows the load
speed. (Set the speed for 60Hz operation.)
0, 0.1 to 999
0
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