Load Torque High Speed Frequency Control (Pr. 4, Pr. 5, Pr. 270 To Pr. 274) - Mitsubishi Electric FR-A760 Series Instruction Manual

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.
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 designed
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 (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
* When Pr. 570 Multiple rating setting ≠ "2", performing inverter reset and all parameter clear changes the setting range. (Refer to page
143)
<Connection diagram>
Sink logic
Pr. 186 = 19
Load torque high-speed frequency
* The used terminal changes according to the Pr. 180 to Pr. 189 (input terminal function selection)
to increase speed
Initial Setting
Value Range
60Hz 0 to 400Hz
30Hz 0 to 400Hz
0
50% 0 to 220% *
100% 0 to 220% *
0 to 400Hz
9999
16 1 to 4000
MCCB
Power supply
Start signal
Special operation and frequency control
<Without high-speed
frequency control>
Whether there is a load or
not, the lift is moved
vertically at the same speed.
Set the higher-speed frequency.
Set the lower-speed frequency.
0 Normal operation
1 Stop-on-control (refer to page 200)
2 Load torque high speed frequency control
Stop-on-contact (refer to page 200) + load torque high
3
speed frequency control
Set the upper and lower limits of the current at high and
middle speeds.
Average current during acceleration from (Pr. 273 × 1/2)
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.
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
Motor
T/L3 W
STF
CS(X19)
*
SD
<With high-speed
frequency control>
Light
Faster
The lift with a light load or without
a load is moved faster than the lift
with a load.
(The output frequency is increased.)
Description
×
Pr. 274 and the initial
settings.
4
359