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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)
<Connection diagram>
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 designed to increase speed
automatically under light load, for example to minimize
the incoming/outgoing time in a multi-story parking lot.
Parameter
Number
Name
Initial
Value
Setting
Range
Description
4
Multi-speed setting (high
speed)
60Hz 0 to 400Hz Set the higher-speed frequency.
5
Multi-speed setting
(middle speed)
30Hz 0 to 400Hz Set the lower-speed frequency.
270
Stop-on contact/load
torque high-speed
frequency control
selection
0
0 Normal operation
1 Stop-on-control (refer to page 214)
2 Load torque high speed frequency control
3
Stop-on-contact (refer to page 214) + load torque high speed
frequency control
11 Stop-on-control
E.OLT is invalid
under stop-on-
control
13
Stop-on-contact + load torque high
speed frequency control (refer to page
214)
271
*1
High-speed setting
maximum current
50% 0 to 220%
Set the upper and lower limits of the current at high and
middle speeds.
272
*1
Middle-speed setting
minimum current
100% 0 to 220%
273
*1 Current averaging range 9999
0 to 400Hz
Average current during acceleration from (Pr. 273 × 1/2) Hz
to (Pr. 273) Hz can be achieved.
9999
Average current during acceleration from (Pr. 5 × 1/2) Hz to
(Pr. 5) Hz is achieved.
274
*1
Current averaging filter
time constant
16 1 to 4000
Set the time constant of the primary delay filter relative to
the output current.
The time constant [ms] is 0.75
× Pr. 274 and the initial value
is 12ms.
A larger setting provides higher stability but poorer response.
*1 This parameter allows its setting to be changed during the operation in any operation mode even if "0 (initial value) or 1" is set in Pr.77 Parameter
write selection.
.......... Specifications differ according to the date assembled. Refer to page 484 to check the SERIAL number.
<Without high-speed
frequency control>
<With high-speed
frequency control>
Light
Faster
Whether there is a load or
not, the lift is moved
vertically at the same speed.
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.)
Mechanical
brake
R/L1
S/L2
T/L3
Motor
MC
STF
CS(X19)
*
Start signal
Load torque high-speed frequency
MCCB
Power supply
U
V
W
Pr. 186 = 19
Sink logic
SD
* The used terminal changes according to the Pr. 180 to Pr. 189 (input terminal function selection) settings.