Mitsubishi Electric 700 Series Instruction Manual page 142

(4) Regenerative brake duty alarm output
100%: regenerative overvoltage protection operation value
Ratio of the brake
duty to the Pr. 70
setting (%)
100
85
Regenerative brake
Not
pre-alarm [RB] displayed
REMARKS
Refer to page 25 to 28 for connecting the brake resistor (MRS type, MYS type), high-duty brake resistor (FR-ABR) and brake unit
(FR-BU2).
The value set in Pr. 70 must not exceed the setting of the brake resistor used.
Otherwise, the resistor can overheat.
Parameters referred to
Pr. 57 Restart coasting time
Time
Not
Displayed Displayed
displayed
WARNING
Refer to page 151
Motor brake and stop operation
[RB] appears on the operation panel when 85% of the
regenerative brake duty set in Pr. 70 is reached. If the
regenerative brake duty reaches 100% of the Pr. 70
setting, a regenerative overvoltage (E.OV1 to E.OV3)
occurs.
Note that [RB] is not displayed when Pr. 30 = "0".
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