Load Torque High Speed Frequency Control - Mitsubishi Electric FR-A820-00046 Instruction Manual

(A) Application parameters
5.14.5

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 regen-
erative 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.
Fig. 5-235:
Pr.
4
D301
5
D302
270
A200
271
A201
272
A202
273
A203
274
A204
5 - 494
<Without high-speed
frequency control>
Whether there is a load or
not, the lift is moved
vertically at the same speed.
Increased speed under light load
Initial value
Name
FM
Multi-speed setting (high
60 Hz 50 Hz 0 to 590 Hz Set the higher-speed frequency.
speed)
Multi-speed setting
(middle speed)
Stop-on contact/load
torque high-speed
frequency control selection
High-speed setting
maximum current
Middle-speed setting
minimum current
Current averaging range
Current averaging filter
time constant
<With high-speed
frequency control>
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.)
Setting
Description
range
CA
30 Hz 0 to 590 Hz Set the lower-speed frequency.
0 Normal operation
1 Stop-on-contact control (Refer to page 5-489.)
2 Load torque high-speed frequency control
Stop-on-contact (refer to page 5-489) + load torque
3
0
high- speed frequency control
11 Stop-on-contact control
Stop-on-contact + load torque high-
speed frequency control
13
(Refer to page 5-489.)
50% 0 to 400%
Set the upper and lower limits of the current at high
and middle speeds.
100% 0 to 400%
Set the average current during acceleration from
0 to 590 Hz
(Pr. 273 × 1/2) Hz to (Pr. 273) Hz.
9999
Set the average current during acceleration from
9999
(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
16 1 to 4000
value is 8 ms.)
A larger setting results in a stable operation with
poorer response.
Parameters
Light
Faster
E.OLT invalid
under stop-on-
contact control
I002678E