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Operation Example - Mitsubishi Electric FR-A500 Instruction Manual

Transistorized inverter.
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<Operation example>
Terminal
STF (STR)
CS
• When operation is performed with X19 (load detection high-speed frequency function selection) signal on,
the inverter automatically varies the maximum frequency between Pr. 4 "multi-speed setting (high speed)"
and Pr. 5 "multi-speed setting (middle speed)" settings as shown below according to the average current
flowing during acceleration from the frequency half of the Pr. 5 setting to the frequency set in Pr. 5.
Example: 1. If the average current is not more than the following, the maximum running frequency is the
value set in Pr. 4 as shown in operation example
Rated inverter current × Pr. 271 setting (%)
2. If the average current is not less than the following, the maximum running frequency is the value
set in Pr. 5 as shown in operation example
Rated inverter current × Pr. 272 setting (%)
<In this example, the frequency varies according to the current; 60Hz for 100% current and 120Hz for
50% current.>
<Setting>
1) Set "2 or 3" in Pr. 270.
2) Assign X19 (load torque high-speed frequency control) to the input terminal using any of
Pr. 180 to Pr. 186.
3) Refer to the following table and set the parameters:
Parameter
Name
Number
4
Multi-speed setting (high speed)
5
Multi-speed setting (middle speed)
271
High-speed setting maximum current
272
Mid-speed setting minimum current
273
Current averaging range
274
Current averaging filter constant
Power running
A
Pr.4
Pr.5
1
×
Pr.5
2
Less than Pr. 271 setting
rated current
Pr.4
(120Hz)
Pr.5
(60Hz)
Pr.271
(50%)
Setting
0 to 400Hz
0 to 400Hz
0 to 200%
0 to 200%
0 to 400Hz
9999
1 to 4000
171
Regenerating
B
Pr.5
1
×
Pr.5
2
More than Pr. 272 setting
rated current
.
B
.
Average current
Pr.272
(100%)
Description
Set the higher-speed frequency.
Set the lower-speed frequency.
Set the upper and lower limits of the current at high and middle
speeds.
(Average current during acceleration from (Pr. 273
(Pr. 273) Hz can be achieved.
Average current during acceleration from (Pr. 5
(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
is 12ms.) A larger setting provides higher stability but poorer
response.
PARAMETERS
ON
OFF
×
1/2) Hz to
×
1/2) Hz to
×
Pr. 274 and the factory setting
4

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