Mitsubishi Electric FATEC FR-A800 Manual page 135

7
REVIEW OF INSTALLATION ENVIRONMENT
(5) Wiring of the FR-BU2 brake unit
For the wiring, connect a pair of the FR-BU2 brake unit and discharging resistor or resistor unit to
the inverter terminals P/+ and N/-.
(a) The FR-BU2 brake unit and the discharging resistor
Three-phase AC
power supply
∗1 When wiring, make sure to match the terminal symbol (P/+, N/-) at the inverter side and at the brake unit (FR-BU2) side.
∗2 When the power supply is 400 V class, install a stepdown transformer.
∗3 Remove the jumper across terminals PR and PX when using the FR-BU2 with the inverter of the FR-A800 series 7.5K
∗4 The wiring distance between the inverter, brake unit (FR-BU2), and discharging resistor must be within 5 m.
∗5 It is recommended to install an external thermal relay to prevent overheat of the discharging resistor.
Fig. 7.41 Wiring method of the brake unit (GRZG type discharging resistor)
(b) The FR-BU2 brake unit and the FR-BR resistor unit
Three-phase AC
power supply
∗1 When wiring, make sure to match the terminal symbol (P/+, N/-) at the inverter side and at the brake unit (FR-BU2) side.
∗2 When the power supply is 400 V class, install a stepdown transformer.
∗3 Remove the jumper across terminals PR and PX when using the FR-BU2 with the inverter of the FR-A800 series 7.5K
or lower or the FR-V500 series 5.5K or lower.
∗4 The wiring distance between the inverter, brake unit (FR-BU2), and resistor unit (FR-BR) must be within 5 m.
Even when the cable is twisted, the wiring length must be within 10 m.
∗5 The contact between TH1 and TH2 is closed in the normal status and is open at a fault.
∗6 For details of MT-BR5 type resistor unit, refer to the optional catalog.
7.3 Problems and measures when using inverter
130
MCCB
(Incorrect connection will damage the inverter and brake unit.)
or lower or the FR-V500 series 5.5K or lower.
Even when the cable is twisted, the wiring length must be within 10 m.
MCCB MC
(Incorrect connection will damage the inverter and brake unit.)
Fig. 7.42 Wiring method of the brake unit (FR-BR resistor unit)
T ∗2
MC
Motor
U
R/L1
V
S/L2 IM
W
T/L3
Inverter
PR
∗3
P/+
∗1
PX
N/-
10 m or less
T ∗2
M
Motor
U
R/L1
S/L2 V
IM
W
T/L3
∗4
Inverter
PR
∗3
P/+
PX
∗1
N/-
∗4
5 m or less
ON OFF OCR contact
MC
MC
GRZG type
discharging resistor
OCR
R R
External thermal
∗5
relay
FR-BU2
∗4
PR
A
P/+ B
*1
N/-
C
BUE
SD
∗4
ON OFF
MC
C
FR-BR
P ∗5
TH1
PR
TH2
FR-BU2
PR
A
P/+ B
N/- C
BUE
SD