Mitsubishi Electric FR-A700 Technical Manual page 67

(2) Connection with the MT-HC (75K or more)
MCCB
Three-phase
AC power
supply
*1 Remove the jumpers across the inverter terminals R/L1 and R1/
L11, S/L2 and S1/L21, and connect the control circuit power
supply to terminals R1/L11 and S1/L21. Always keep terminals
R/L1, S/L2, T/L3 open. Incorrect connection will damage the
inverter. (E.OPT (Option fault) will occur.) (Refer to page 97)
*2 Do not insert an MCCB between terminals P/+ and N/-
(between P and P/+, between N and N/-). Opposite
polarity of terminals N/-, P/+ will damage the inverter.
*3 Use [Pr. 178 to Pr. 189 Input terminal function selection] to assign
terminals used for X10 and X11 signal. (Refer to page 37)
Terminal MRS can be used when not using inverter operation
enable signal (X10).
For communication where the start command is sent only
1.4.16 24VDC and external transistor common (PC)
When the transistor output (open collector) of a
programmable controller having an external power supply is
input to the inverter, supply external interface power to
prevent a malfunction from occurring due to undesirable
current as shown below.
Making connections as shown on the right supplies external
power to the photocoupler in the inverter as indicated by the
dotted lines. Since terminal SD is not connected, no power
is supplied to the photocoupler from the control power
supply of the inverter.
Also, terminals PC-SD may be used as a 24VDC 0.1A
power output. When using terminals PC-SD as a 24VDC
power supply, malfunction due to undesirable currents can
not be prevented.
When terminal PC is not used
When the control power voltage in the inverter connected with
the output module (open collector output) of the programmable
controller has become higher than the external power supply
voltage of the programmable controller as shown on the right, a
current indicated by the dotted lines flows if the transistor of the
programmable controller is not on, accidentally giving the
inverter a command signal.
Measures
(1)Insert a diode to prevent undesirable currents.
(2) Use an all-point independent type output module.
(such as QY68A)
MT-HCL01 MT-HCB
R R2
R2 R3
S S2
S2 S3
T T2
T2 T3
88R
88S
R1 S1
MT-HCL02 MT-HC
*5
R3 R4 R4
S3 S4 S4
T3 T4 T4
88R
88S
*5
R
Phase
S
detection
T
R1 S1
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 331)
*4 Connect the power supply to terminals R1 and S1 of the
MT-HC via an insulated transformer.
*5 The voltage phases of terminals R, S, T and terminals
R4, S4, T4 must be matched.
*6 Use sink logic (factory setting) when the MT-HC is
connected. The MT-HC cannot be connected when
source logic is selected.
*7 When connecting the inverter to the MT-HC, do not
connect the DC reactor provided to the inverter.
common
(common)
Programmable controller
DC12/24V
Y00
Photocoupler
0V
DC12/24V
Photocoupler
Y00
0V
Programmable
controller MELSEC-Q
60
SPECIFICATIONS
Inverter
R/L1 U
*1
S/L2 V
T/L3 W
P P/+
*2
N N/
Y1
X11
*3
RDY
X10
*3
RSO
RES
SE
SD
*1
R1/ S1/
L11 L21
MT-HCTR
*4
Insulated transformer
Inverter
PC
Photocoupler
STF
External
SD
power
supply for
MELSEC
Diode provided as
counter measure
External
STF
power
supply for
MELSEC
SD
Inverter
Motor
IM
Inverter control
power supply
Photocoupler
Inverter control
power supply
(+24V)