Connection Of The Brake Unit (Bu Type); Connection Of The High Power Factor Converter (Fr-Hc/Mt-Hc) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

2.5.4

Connection of the brake unit (BU type)

Connect the brake unit (BU type) correctly as shown below. Incorrect connection will damage the inverter. Remove the
jumper across terminals HB-PC and terminals TB-HC of the brake unit and fit it to across terminals PC-TB.
Three-phase AC
power supply
*1 When the power supply is 400V class, install a step-down transformer.
*2 For capacity 7.5K or less, remove the jumper across terminals PR-PX.
CAUTION
⋅ The wiring distance between the inverter, brake unit and resistor unit should be within 2m. If twisted wires are used, the
distance should be within 5m.
⋅ If the transistors in the brake unit should become faulty, the resistor can be unusually hot, causing a fire. Therefore, install a
magnetic contactor on the inverter's power supply side to configure a circuit so that a current is shut off in case of fault.
⋅ Do not remove a jumper across terminal P/+ and P1 except when connecting a DC reactor.
2.5.5

Connection of the high power factor converter (FR-HC/MT-HC)

When connecting the high power factor converter (FR-HC/MT-HC) to suppress power harmonics, perform wiring
securely as shown below.
Incorrect connection will damage the high power factor converter and inverter.
After making sure that the wiring is correct, set "2" in Pr. 30 Regenerative function selection. (Refer to page 198.)
(1) Connection with the FR-HC (55K or less)
MC
MCCB
Power
supply
*1 Remove the jumpers across the inverter terminals R/L1-R1/L11, S/L2-S1/L21, and connect the control circuit power supply to the R1/L11
and S1/L21 terminals. Always keep the power input terminals R/L1, S/L2, T/L3 open. Incorrect connection will damage the inverter.
(E.OPT (option alarm) will occur. (Refer to page 396.))
Do not insert the MCCB between terminals P/+ − N/- (P/+ − P/+, N/- − N/-). Opposite polarity of terminals N/-, P/+ will damage the inverter.
*2
*3 Use Pr. 178 to Pr. 189 (input terminal function selection) to assign the terminals used for the X10 (X11) signal. (Refer to page 222.)
For communication where the start command is sent only once, e.g. RS-485 communication operation, use the X11 signal when making
setting to hold the mode at occurrence of an instantaneous power failure. (Refer to page 199.)
CAUTION
⋅ The voltage phases of terminals R/L1, S/L2, T/L3 and terminals R4, S4, T4 must be matched.
⋅ Use sink logic (factory setting) when the FR-HC is connected. The FR-HC cannot be connected when source logic is selected.
⋅ Do not remove a jumper across terminal P/+ and P1 except when connecting a DC reactor.
MCCB
T *
1
MC ON
Remove the
OFF
jumper
MC
Fit a jumper
PC HA HB HC TB
OCR
External box
(FR-HCB)
Reactor1
(FR-HCL01)
R R2 R2
S S2 S2
T T2 T2
Connection of stand-alone option units
MC
Inverter
U
R/L1
V
S/L2
W
T/L3
PR
*2
PX
P/+ N/−
Electrical-discharge
resistor
P PR
OCR
Brake unit (BU type)
High power factor converter
(FR-HC)
MC1 MC1
MC2 MC2
Reactor2
(FR-HCL02)
R3 R3 R4 R4
S3 S3 S4 S4
T3 T3 T4 T4 Y1orY2
RDY
RSO
R
phase
S
detection
T
Motor
I M
N
Inverter
Motor
R/L1
U
I M
S/L2 V
*1
W
T/L3
P P/+
*2
N N/-
X11
*3
X10
*3
RES
SE SD
R1/L11
*1
S1/L21
2
49