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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 166

Transistorized inverter, high function & low acoustic noise.
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Pr. 251 "Output phase failure protection selection"
You can make invalid the output phase failure protection (E.LF) function which stops the inverter output if one
of the three phases (U, V, W) on the inverter's output side (load side) becomes open.
Parameter
Setting Range
Number
Increments
251
0, 1
Pr. 252 "override bias"
Pr. 253 "override gain"
You can extend the 50% to 150% override range (to 0% to 200%), which is covered when Pr. 73 "0 to 5V, 0
to 10V selection" is used to select the override, and set the override value as desired.
Parameter Number
Setting Range
252
0 to 200%
253
0 to 200%
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Minimum
Setting
Factory Setting
0: Without output phase failure protection
1
1
1: With output phase failure protection
Minimum Setting
Increments
0.1%
0.1%
200
150
Pr. 252
100
Pr. 253
50
0
0V
2.5V
(5V)
Voltage across 2-5
153
PARAMETERS
Description
Related parameters
Pr. 73 "0 to 5V, 0 to 10V selection"
Factory Setting
50%
150%
Factory setting
(50% to 150%)
5V
(10V)

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