Connection Of The Brake Unit (Fr-Bu2) - Mitsubishi Electric FR-A800 Series Instruction Manual

Voltage class
FR-A840-00023(0.4K)
FR-A840-00038(0.75K)
FR-A840-00052(1.5K)
FR-A840-00083(2.2K)
FR-A840-00126(3.7K)
FR-A840-00170(5.5K)
FR-A840-00250(7.5K)
400 V class FR-A840-00310(11K)
FR-A840-00380(15K)
FR-A840-00470(18.5K)
FR-A840-00620(22K)
FR-A840-00770(30K)
FR-A840-00930(37K)
FR-A840-01160(45K)
FR-A840-01800(55K)
*1 Power consumption differs according to the voltage protection level. The voltage protection level is set in Pr.977. (Refer to
Set parameters as follows:
• Pr.30 Regenerative function selection = "1"
• Set Pr.70 Special regenerative brake duty according to the amount and frequency of the regenerative driving, and make
sure that the resistor can consume the regenerative power properly. (Refer to
• When the regenerative brake transistor is damaged, install a thermal relay as shown in the following sequence to prevent
overheat and burnout of the brake resistor. Properly select a thermal relay according to the regenerative driving frequency
or the rated power or resistance of the brake resistor.
<Example 1>
Power
Supply
T
F
MC
OFF ON
Contact
MC
*1 Since the FR-A820-00630(11K) or higher and FR-A840-00310(11K) or higher are not provided with terminal PX, a jumper need not to be
removed.
CAUTION
• If the resistor selection is incorrect, overcurrent may damage the inverter built-in brake transistor. Besides, the resistor
may be burned due to overheat.
• If the selection of the thermal relay is incorrect, the resistor may be burned due to overheat.

2.10.2 Connection of the brake unit (FR-BU2)

Connect the brake unit (FR-BU2(-H)) as follows to improve the braking capability during deceleration.
100
2. INSTALLATION AND WIRING
2.10 Connection of stand-alone option units
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Inverter Minimum resistance (Ω)
371
236
190
130
83
66
45
34
34
21
21
13.5
13.5
13.5
13.5
Thermal relay
(OCR)
MC Inverter
R/L1 P/+
(P3)
S/L2
T/L3
PX
PR
Remove the jumper. (∗1)
OCR
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Power consumption (kW)
Pr.977 = "0"
1.56
2.45
3.04
4.44
6.96
8.75
12.8
17.0
17.0
27.5
27.5
42.8
42.8
42.8
42.8
<Example 2>
Brake resistor
R
Power
Supply
T
F
ON OFF
MC
*1
Pr.977 = "1"
1.66
2.61
3.24
4.74
7.42
9.34
13.7
18.1
18.1
29.3
29.3
45.6
45.6
45.6
45.6
page 724.)
Thermal relay
MC Inverter
(OCR)
R/L1 P/+
S/L2 (P3)
T/L3
PX
PR
Remove the jumper. (∗1)
B
C
OCR
MC
Contact
page 345.)
Brake resistor
R