Mitsubishi Electric FR-A700 Series, Техническое руководство

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223
2
P
ARAM
ETE
R
PARAMETER
(6) Override function [
Pr. 252, 253
]
Use the override function to change the main speed
at a fixed ratio.
When an override is selected, the terminal 1 or
terminal 4 is used for the main speed setting and the
terminal 2 for the override signal. (When the main
speed of the terminal 1 or terminal 4 is not input,
compensation by the terminal 2 is invalid.)
When inputting compensation to multi-speed
operation or remote setting, set [
Pr. 28 Multi-speed
input compensation selection = 1] .(Refer to page 227)
Using [ Pr. 252, 253 ], set the override range. Use a
following formula for the set frequency for override.
Main speed set frequency (Hz): Terminal 1, 4 input, multi-
speed setting
Compensation amount (%): Terminal 2 input
Example: When [ Pr. 73 = 5 ]
Set
frequency
(Hz)
= Main speed set frequency (Hz)
A700 F700
Compensation
amount(%)
100(%)
Bias
[ Pr.252 ]
0V 2.5V
(5V) 5V
(10V)
0
50
100
150
200
Initial value
(50% to 150%)
Voltage across terminals 2 and 5
Override value (%)
Gain
[ Pr.253 ]
The set frequency changes as shown below according
to the terminal 1 (main speed) and terminal 2
(auxiliary) inputs.
Override connection diagram
10
2
5
Forward
rotation
Main
speed
Inverter
STF
1
(-)
(+)
Override
setting
SD
0 2.5 5
0
Terminal 1 input voltage (V)
Set frequency (Hz)
Terminal 2
5VDC input(150%)
Terminal 2
0V input(50%)
Terminal 2
2.5VDC input(100%)
30
15
60
45
90
[ Pr. ] Name Initial Value
Setting
Range
Description
252 Override bias 50% 0 to 200% Set the bias side compensation value of override function.
253 Override gain 150% 0 to 200% Set the gain side compensation value of override function.