Mitsubishi Electric FR-A800, Instruction Manual

Page: 674 / 1042

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