Mitsubishi Electric FR-A700 Instruction Manual page 434

Motor brake and stop operation
Power supply specification at DC feeding
400V class
b
ACHTUNG:
As voltage between P/+, N/- becomes 830V or more temporarily at regeneration, make
selection of DC power supply carefully.
Regenerative brake duty alarm output and alarm signal (RBP signal)
● [RB] appears on the operation panel and an alarm signal (RBP) is output 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.
● The inverter does not trip even when the alarm (RBP) signal is output.
● For the terminal used for the RBP signal output, assign the function by setting "7 (source
logic) or 107 (sink logic)" in any of Pr. 190 to Pr. 196 "Output terminal function selection".
Fig. 6-104: Regenerative overload
NOTES The MRS signal can also be used instead of the X10 signal.
Refer to section 3.8 for the connection of high-duty brake resistor (FR-ABR), brake unit, high
power factor converter (FR-HC, MT-HC) and power regeneration common converter (FR-
CV).
When AC power is connected to terminal R/L1, S/L2, T/L3 during DC feeding with "2, 10, 11,
20, or 21" (DC feeding) set in Pr.30, an option alarm (E.OPT) occurs.
When DC feeding operation is performed with "2, 10, 11, 20, or 21" (DC deeding) set in Pr.
30, undervoltage protection (E.UVT) and instantaneous power failure (E.IPF) are not
detected.
The brake resister is not connectable to the 00770 or more inverter, the Pr. 70 setting is
invalid.
When terminal assignment is changed using Pr. 178 to Pr. 189 "Input terminal function
selection" and Pr. 190 to Pr. 196 "Output terminal function selection", the other functions
may be affected. Make setting after confirming the function of each terminal.
b
CAUTION:
The value set in Pr. 70 must not exceed the setting of the brake resistor used.
Otherwise, the resistor can overheat.
6 - 254
Rated input DC voltage
Permissible fluctuation
100 %: Overvoltage tripping
Ratio of the brake
duty to the Pr. 70
setting (%)
Regenerative brake
pre-alarm (RBP)
537V DC to 679V DC
457V DC to 740V DC
OFF ON ON
Parameter
100 %
85 %
Time
I001566E