Load Torque High-Speed Frequency Control - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

NOTE
• Changing the terminal assignment using Pr.178 to Pr.189 (Input terminal function selection) may affect the other functions.
Set parameters after confirming the function of each terminal.
Parameters referred to
Pr.4 to Pr.6, Pr.24 to Pr.27 (multi-speed
Pr.15 Jog frequencypage 390
Pr.22 Stall prevention operation level, Pr.48 Second stall prevention operation level
Pr.22 Torque limit levelpage 235
Pr.59 Remote function selectionpage 359
Pr.72 PWM frequency selectionpage 339
Pr.79 Operation mode selectionpage 370
Pr.95 Online auto tuning selectionpage 527
Pr.128 PID action selectionpage 570
Pr.178 to Pr.189 (Input terminal function
Pr.270 Stop-on contact/load torque high- speed frequency control
Pr.292 Automatic acceleration/decelerationpage

5.14.6 Load torque high-speed frequency control

Load torque high-speed frequency control is a function that automatically sets the maximum operable 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. (In 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.
<Without high-speed
frequency control>
Whether there is a load or The lift with a light load or without
not, the lift is moved a load is moved faster than the lift
vertically at the same speed. with a load.
(The output frequency is increased
only during power driving.)
Pr. Name
4 Multi-speed setting
D301 (high speed)
5 Multi-speed setting
D302 (middle speed)
Stop-on contact + load
270
torque high speed
A200
frequency control
271 High-speed setting
A201 maximum current
272 Middle-speed setting
A202 minimum current
273 Current averaging
A203 range
274 Current averaging filter
A204 time constant
setting)page 391
selection)page 496
selectionpage 549
365, page 368
<With high-speed
frequency control>
Light
Faster
Initial value
Setting range
FM CA
60 Hz 50 Hz 0 to 590 Hz
30 Hz 0 to 590 Hz
0
1
2
3
0
11
13
50% 0 to 400%
100% 0 to 400%
0 to 590 Hz
9999
9999
16 1 to 4000
levelpage 409
Description
Set the higher-speed frequency.
Set the lower-speed frequency.
Normal
Stop-on-contact control (Refer to
Load torque high-speed frequency control
Stop-on contact (refer to page 546) + load torque high speed
frequency control
Stop-on-contact control
Stop-on contact + load torque high
speed frequency control
(Refer to page 546.)
Set the upper and lower limits of the current at high and middle
speeds.
Set the average current during acceleration from (Pr.273 × 1/2) Hz
to (Pr.273) Hz.
Set the average current during acceleration from (Pr.5 × 1/2) Hz to
(Pr.5) Hz.
Set the time constant of the primary delay filter relative to the output
current.
(The time constant [ms] is 0.5 × Pr.274, and the initial value is 8 ms.)
A larger setting results in a stable operation with poorer response.
page 546.)
E.OLT is invalid under
stop on-contact control.
5. PARAMETERS
5.14 (A) Application parameters
1
2
3
4
5
6
7
8
9
10
549