Selection Of A Regenerative Brake (Pr. 30, Pr. 70) - Mitsubishi Electric FR-E720-0.1K(SC) Instruction Manual

Motor brake and stop operation

4.10.2 Selection of a regenerative brake (Pr. 30, Pr. 70)

When making frequent starts/stops, use the optional brake resistor (MRS type, MYS type), high-duty brake resistor
(FR-ABR) and brake unit (FR-BU2) to increase the regenerative brake duty.
Use a power regeneration common converter (FR-CV) for continuous operation in regeneration status.
Use the high power factor converter (FR-HC) to reduce harmonics, improve the power factor, or continuously use the
regenerative status.
Parameter
Name
Number
Regenerative function
30
selection
Special regenerative
70
brake duty
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 188)
(1) When using the brake resistor (MRS type, MYS type), brake unit (FR-BU2), power regeneration
common converter (FR-CV), and high power factor converter (FR-HC).
Set Pr. 30 to "0" (initial value). The Pr. 70 setting is made invalid.
At this time, the regenerative brake duty is as follows.
Type
FR-E720-0.4K(SC) to 3.7K(SC)
FR-E720S-0.4K(SC) or more
FR-E710W-0.4K or more
FR-E720-5.5K(SC) or more
FR-E740-0.4K(SC) or more
Assign the inverter operation enable signal (X10) to the contact input terminal. To make protective coordination with the
FR-HC and FR-CV, use the inverter operation enable signal to shut off the inverter output.
Input the RDY signal of the FR-HC (RDYB signal of the FR-CV).
For the terminal used for X10 signal input, assign its function by setting "10" (X10) to any of Pr. 178 to Pr. 184.
(2) When using the brake resistor (MYS type) at 100% torque / 6%ED (FR-E720-3.7K only)
Set "1" in Pr. 30.
Set "6%" in Pr. 70.
(3) When using the high-duty brake resistor (FR-ABR) (0.4K or more)
Set "1" in Pr. 30.
Set Pr. 70 as follows.
7.5K or less.............. 10%
11K, 15K .................. 6%
(4) When a high power factor converter (FR-HC) is used and automatic restart after instantaneous
power failure function is made valid.
When automatic restart after instantaneous power failure function of both the FR-HC and inverter is valid (when a value
other than "9999" is set in Pr. 57 Restart coasting time), set "2" in Pr. 30 .
Set Pr. 70 to "0%" (initial value).
When the FR-HC detects power failure during inverter operation, the RDY signal turns ON, resulting in the motor coasting.
Turning the RDY signal OFF after power restoration, the inverter detects the motor speed (depends on the Pr.162
Automatic restart after instantaneous power failure selection ) and restarts automatically after instantaneous power failure.
130
Initial Setting
Value Range
0
0
1
2
0% 0 to 30%
Regenerative Brake Duty
3%
2%
Description
Inverter without regenerative function
Brake resistor (MRS type, MYS type)
Brake unit (FR-BU2)
Power regeneration common converter (FR-CV)
High power factor converter (FR-HC)
Brake resistor (MYS type) used at 100% torque / 6%ED
High-duty brake resistor (FR-ABR)
High power factor converter (FR-HC) when automatic
restart after instantaneous power failure is selected
Brake duty (6%) when using the brake resistor (MYS type),
Brake duty when using the high-duty brake resistor
(FR-ABR)(10%)