Load Torque High Speed Frequency Control - Mitsubishi Electric FR-A700 Instruction Manual

Parameter
6.24.3 Load torque high speed frequency control (Pr. 4, Pr. 5, Pr. 270 bis 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 to increase speed automatically under light load, for example to mi-
nimize the incoming/outgoing time in a multi-story parking lot.
Fig. 6-253: Reduction of vibrations in vertikal motion applications
Pr. No. Name
Multi-speed setting
4
(high speed)
Multi-speed setting
5
(middle speed)
Stop-on contact/load tor-
270
que high-speed frequency
control selection
High-speed setting maxi-
271
mum current
Untere Stromgrenze für
272
mittlere Frequenz
273
Current averaging range
Current averaging filter
274
time constant
When Pr. 570 Multiple rating setting ≠ "2", performing all parameter clear and inverter reset
changes the setting range. (Refer to section 6.7.5).
FR-A700 EC
Without high-speed frequency control
Whether there is a load or not, the
lift is moved vertically at the same
speed
Werks-
Initial
Value
einstellung
50Hz 0–400Hz
30 Hz 0–400 Hz
0
1
0
2
3
50% 0–220%
100% 0–220%
0–400Hz
9999
9999
16 1–4000
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.)
Description
Set the higher-speed frequency
Set the lower-speed frequency
Normal operation
Stop-on-control
(refer to section 6.13.4)
Load torque high speed fre-
quency control
Stop-on-contact (refer to sec-
tion 6.13.4) + load torque high
speed frequency control
Set the upper and lower limits of
the current at high and middle
speeds.
Average current during accele-
ration from (Pr. 273 × 1/2) Hz to
(Pr. 273) Hz can be achieved.
Average current during accele-
ration from (Pr. 5 × 1/2) Hz to
(Pr. 5) Hz is achieved.
Set the time constant of the pri-
mary delay filter relative to the
output current.
The time constant [ms] is
0.75 × Pr. 274 and the initial
value is 12ms.
A larger setting provides higher
stability but poorer response.
Special operation
Light
Faster
Parameters referred to
4–6 Multi-speed setting
24–27
59 Remote function
selection
79 Operation mode
selection
128 PID action selection
178–189 Input terminal func-
tion selection
I001623E
Refer to
Section
6.10.1
6.10.4
6.22.1
6.24.1
6.14.1
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