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Special operation and frequency control
4.25.3 Load torque high speed frequency control (Pr. 4, Pr. 5, Pr. 270 to Pr. 274)
Load torque high speed frequency control is a function
which automatically sets the operational maximum
frequency according to the load.
The load size during power driving is estimated by
detecting average currents at set timings after a start.
When the load is light, the frequency is increased from
the originally-set frequency. (During regenerative
driving, the frequency is not increased.)
This
function
is
automatically under light load, for example to minimize
the incoming/outgoing time in a multi-story parking lot.
Parameter
Name
Number
Multi-speed setting (high
4
speed)
Multi-speed setting
5
(middle speed)
Stop-on contact/load
270
torque high-speed
frequency control
selection
High-speed setting
271
*2
maximum current
Middle-speed setting
272
*2
minimum current
273
Current averaging range
*2
Current averaging filter
274
*2
time constant
When Pr. 570 Multiple rating setting "2", performing inverter reset and all parameter clear changes the setting range. (Refer to page 157)
*1
*2
This parameter allows its setting to be changed during operation in any operation mode even if "0" (initial value) is set in Pr. 77 Parameter write
selection .
...........Specifications differ according to the date assembled. Refer to page 491 to check the SERIAL number.
<Connection diagram>
Load torque high-speed frequency
* The used terminal changes according to the Pr. 180 to Pr. 189 (input terminal function selection) settings.
382
designed
to
increase
Initial
Value
60Hz
30Hz
0
50%
100%
9999
16
Sink logic
Pr. 186 = 19
MCCB
Power supply
Start signal
<Without high-speed
frequency control>
Whether there is a load or
not, the lift is moved
speed
vertically at the same speed.
Setting
Range
0 to 400Hz
Set the higher-speed frequency.
0 to 400Hz
Set the lower-speed frequency.
0
Normal operation
1
Stop-on-control (refer to page 218)
2
Load torque high speed frequency control
Stop-on-contact (refer to page 218) + load torque high speed
3
frequency control
11
Stop-on-control
Stop-on-contact + load torque high
13
speed frequency control (refer to page
218)
0 to 220%
Set the upper and lower limits of the current at high and
*1
middle speeds.
0 to 220%
*1
Average current during acceleration from (Pr. 273 1/2) Hz
0 to 400Hz
to (Pr. 273) Hz can be achieved.
Average current during acceleration from (Pr. 5 1/2) Hz to
9999
(Pr. 5) Hz is achieved.
Set the time constant of the primary delay filter relative to
the output current.
1 to 4000
The time constant [ms] is 0.75
is 12ms.
A larger setting provides higher stability but poorer response.
MC
Mechanical
R/L1
U
S/L2
V
T/L3
W
STF
CS(X19)
*
SD
<With high-speed
frequency control>
The lift with a light load or without
a load is moved faster than the lift
with a load.
(The output frequency is increased
only during power driving.)
Description
Pr. 274 and the initial value
brake
Motor
Light
Faster
E.OLT is invalid
under stop-on-
control
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