Mitsubishi Electric FR-A700 Technical Manual page 383

(1) Connection
1) Main Circuit
Fully note the phase rotation of the power supply.
If the phase rotation of the power supply differs,
the rotation direction of the motor is reversed
when switching between the inverter operation
and bypass operation, causing malfunction such
as damage to the machine and motor shaft and
overcurrent alarm of the inverter.
• Connect MC1 to the inverter input side.
• Connect MC2 to the bypass operation side.
• Connect MC3 to the inverter output side.
• Be sure to provide mechanical interlocks for
MC2 and MC3.
2) Control circuit
Connect the control power supply (terminal R1,
S1) in front of input side MC1. If the control power
supply is connected behind input side MC1, the
electronic bypass sequence function is not
executed. In such case, the input side MC1 will
not close and the inverter operation will not be
performed.
• Remove a jumper across terminal R-R1 and S-S1.
• Control power should be supplied from the front
of MC1 and connected to R1 and S1.
3) Input signal (refer to the following table for details)
• CS signal
• STF (STR) signal : Input an inverter forward
• MRS signal
4) Output signal (refer to the next page for details)
• MC1 signal
• MC2 signal
• MC3 signal
Magnetic
Installation Place
Contactor
Between power supply and inverter
MC1
input
MC2 Between power supply and motor
MC3 Between inverter output and motor
: Input a switchover signal for
inverter operation and bypass
operation.
The inverter operation
selected if closed.
rotation (reverse rotation)
start signal.
: Input an operation interlock
signal. Both inverter
operation and bypass
operation are interlocked if
opened.
: Operation timing signal of a
magnetic contactor MC1 on
the inverter input side is
output.
: Operation timing signal of a
magnetic contactor MC2 on
the inverter output side is
output.
: Operation timing signal of a
magnetic contactor MC3 for
bypass operation is output.
During bypass
operation
5) External thermal relay installation
When using an external thermal relay, connect it
to the bypass operation side, not the inverter
output side.
When performing low-noise operation of 400V
class small capacity inverter with an external
thermal relay connected to the output side, the
external thermal relay may operate unnecessarily.
• OH signal
[Connection diagram]
• Sink logic
• [Pr. 185 = 7]
• [Pr. 192 = 17]
• [Pr. 193 = 18]
• [Pr. 194 = 19]
MC1
NFB
Inverter start
(forward rotation)
Inverter/bypass
operation
interlock
External
is
thermal reset
Frequency
setting signal
Electronic bypass sequence connection diagram
*1 Take caution for the capacity of the sequence output
terminal.
The used terminal changes depending on the [Pr. 190 to
Pr. 196 Output terminal function selection] setting.
Output Terminal Capacity
Inverter open collector output
(RUN, SU, IPF, OL, FU)
Inverter relay output
(A1-C1, B1-C1, A2-B2, B2-C2)
Relay output option (FR-A7AR)
*2 When connecting a DC power supply, insert a protective
diode.
When connecting an AC power supply, connect the relay
output option (FR-A7AR) and use a contact output.
*3 The used terminal changes depending on the [Pr. 180 to
Pr. 189 Input terminal function selection] setting.
Operation ( : Shorted,
During inverter
operation
×
×
417
PARAMETER
: Input an external thermal
signal.
External
thermal relay
MC2
MC3
R/L1 U
IM
S/L2 V
T/L3 W
R1/L11
S1/L21
*1
MC
STF (MC1)IPF
1
CS
MRS
MC3
*1
MC
*3 (MC2)OL
2
JOG(0H)
RES
MC2
*1
SD
MC
(MC3)FU
3
10
2
SE
5
Output Terminal
Permissible Load
24VDC 0.1A
230VAC 0.3A
30VDC 0.3A
× : Open)
At an inverter fault
occurrence
×
(Shorted by reset)
×
(Can be selected using [Pr.
138], always open when
external thermal relay is ON)
×
2
*2
24VDC