Mitsubishi Electric FR-A800 Series Instruction Manual page 102

 Connection example with the GRZG type discharging resistor
*1 When wiring, make sure to match the terminal symbols (P/+, N/-) on the inverter and on the brake unit (FR-BU2). (Incorrect connection will
damage the inverter and brake unit.)
*2 When the power supply is 400 V class, install a stepdown transformer.
*3 Be sure to remove the jumper across terminals PR and PX when using the FR-BU2 with the inverter of FR-A820-00490(7.5K) or lower, or FR-
A840-00250(7.5K) or lower.
*4 The wiring distance between the inverter, brake unit (FR-BU2) and discharging resistor must be within 5 m. When using twisted pair cable, use
the cable within 10 m.
*5 It is recommended to install an external thermal relay to prevent overheat of the discharging resistor.
*6 For the connection method of the discharging resistor, refer to the Instruction Manual of the FR-BU2.
*7 Terminal P3 is equipped in the FR-A820-00770(15K) to 01250(22K), and FR-A840-00470(18.5K) to 01800(55K). Terminal P3 has the same
function as terminal P/+ on the inverter.
• Recommended external thermal relay
brake unit
FR-BU2-1.5K
FR-BU2-3.7K
FR-BU2-7.5K
FR-BU2-15K
FR-BU2-H7.5K
FR-BU2-H15K
FR-BU2-H30K
NOTE
• Set "1" in Pr.0 Brake mode selection in the FR-BU2 to use a GRZG type discharging resistor.
• Do not remove the jumper across terminals P/+ and P1 except when connecting a DC reactor (FR-HEL).
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MCCB
Three-phase AC
power supply
Discharging resistor
GZG 300W-50Ω (one)
GRZG 200-10Ω (three in series)
GRZG 300-5Ω (four in series)
GRZG 400-2Ω (six in series)
GRZG 200-10Ω (six in series)
GRZG 300-5Ω (eight in series)
GRZG 400-2Ω (twelve in series)
search engine
T *2
MC
MC
Motor
U
R/L1
S/L2 V M
T/L3 W
Inverter
*4
*7
P/+
PR
*3
(P3)
*1
PX
N/-
10 m or less
Recommended external
thermal relay
TH-T25 1.3A
TH-T25 3.6A
TH-T25 6.6A
TH-T25 11A
TH-T25 3.6A
TH-T25 6.6A
TH-T25 11A
OCR
contact
ON OFF
MC
GRZG type
*6
discharging
OCR
resistor
R R
External thermal
*5
relay
FR-BU2
PR
A
P/+ B
*1
N/- C
BUE
SD
*4
1/L
1
2/T
1
To the brake
unit terminal P/+
2. INSTALLATION AND WIRING
2.10 Connection of stand-alone option units
1
2
3
4
5
6
7
8
9
5/L
3
10
6/T
3
To a resistor
101