Load Torque High Speed Frequency Control (Pr. 4, Pr. 5, Pr. 270 To Pr. 274) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

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
Pr.3
page 155 which automatically sets the operational maximum
Pr.6
frequency according to the load.
page 161
More specifically, the magnitude of the load is judged
Pr.268
according to the average current at a certain time after
page 242
starting to perform operation at higher than the preset
Pr.275
page 204
frequency under light load.
This function
automatically under light load, for example to minimize
the incoming/outgoing time in a multi-story parking lot.
Parameter
Number
Multi-speed setting (high
4
speed)
Multi-speed setting (middle
5
speed)
Stop-on contact/load
torque high-speed
270
frequency control
selection
High-speed setting
271
maximum current
Middle-speed setting
272
minimum current
273 Current averaging range
Current averaging filter
274
time constant
<Connection diagram>
354
is designed to increase
Initial
Name
Value
60Hz
30Hz
0
50%
100%
9999
16
Sink logic
Pr.186 = 19
MCCB
Power supply
Start signal
Load torque high-speed frequency
* The used terminal changes according to the Pr. 180 to Pr. 189 (input terminal function selection) settings.
<Without high-speed
frequency control>
speed
Whether there is a load or
not, the lift is moved
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 204)
2 Load torque high speed frequency control
Stop-on-contact (refer to page 204) +load torque high
3
speed frequency control
0 to 220%
Set the upper and lower limits of the current at high and
middle speeds.
0 to 220%
Average current during acceleration from (Pr. 273 × 1/2)
0 to 400Hz
Hz to (Pr. 273) Hz can be achieved.
Average current during acceleration from (Pr. 5 × 1/2) Hz
9999
to (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
value is 12ms.
A larger setting provides higher stability but poorer response.
MC
Mechanical
brake
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 list
with a load.
(The output frequency is increased.)
Description
×
Pr. 274 and the initial
Motor
Light
Faster