Load Torque High Speed Frequency Control (Pr. 4, Pr. 5, Pr. 270 To Pr. 274) - Mitsubishi Electric FR-B-750 to 75K Instruction Manual

Special operation and frequency control

4.20.2 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.
More specifically, the magnitude of the load is judged
according to the average current at a certain time after
starting to perform operation at higher than the preset
frequency under light load.
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
4
(high speed)
Multi-speed setting
5
(middle 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
* The setting range differs according to the inverter capacity. (22K or less/30K or more)
<Connection diagram>
Load torque high-speed frequency
* The used terminal changes according to the Pr. 180 to Pr. 189 (input terminal function selection) settings.
236
designed to increase
Initial
Value
0 to 120Hz/
60Hz
0 to 60Hz
0 to 120Hz/
30Hz
0 to 60Hz
0
50%
100%
0 to 120Hz/
0 to 60Hz
9999
16
Sink logic
Pr.186 = 19
MCCB
Power supply
Start signal
<Without high-speed
frequency control>
speed
Whether there is a load or
not, the lift is moved
vertically at the same speed.
Setting Range
FR-B FR-B3
0 to 120Hz Set the higher-speed frequency.
*
0 to 120Hz Set the lower-speed frequency.
*
0 0 Normal operation

1 Stop-on-control (refer to page 105)
2 2 Load torque high speed frequency control
Stop-on-contact (refer to page 105) + load torque

3
high 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
0 to 120Hz
× 1/2) Hz to (Pr. 273) Hz can be achieved.
*
Average current during acceleration from (Pr. 5 ×
9999
1/2) Hz to (Pr. 5) Hz is achieved.
Set the time constant of the primary delay filter
relative to the output current.
The time constant [ms] is 0.75
1 to 4000
initial value 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 list
with a load.
(The output frequency is increased.)
Description
×
brake
Motor
Light
Faster
Pr. 274 and the