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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 21

Transistorized inverter, high function & low acoustic noise.
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( 1 ) Description of main circuit terminals
Symbol
Terminal Name
R, S, T
AC power input
〈L
, L
, L
1
2
3
U, V, W
Inverter output
R1, S1
Power supply for control
〈L
, L
circuit
11
21
P, PR
Brake resistor connection
〈+, PR〉
P, N
Brake unit connection
〈+, −〉
P, P1
Power factor improving
〈+, P1〉
DC reactor connection
Built-in brake circuit
PR, PX
connection
Ground
Note: 〈 〉 Terminal names in parentheses are those of the EC version.
( 2 ) Description of control circuit terminals
Type
Symbol
Terminal Name
STF
Forward rotation start
STR
Reverse rotation start
Start self-holding
STOP
selection
RH•RM•RL
Multi-speed selection
JOG
JOG mode selection
Second acceleration/
RT
deceleration time
selection
MRS
Output stop
RES
Reset
Current input
AU
selection
Automatic restart after
CS
instantaneous power
failure selection
Contact input
SD
common (sink)
24VDC power and
external transistor
PC
common
Contact input
common (source)
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INSTALLATION AND WIRING
Connect to the commercial power supply. Keep these terminals unconnected when
using the high power factor converter (FR-HC).
Connect a three-phase squirrel-cage motor.
Connected to the AC power supply terminals R and S 〈L
display and alarm output or when using the high power factor converter (FR-HC),
remove the jumpers from terminals R-R1 and S-S1 〈L
external power to these terminals.
Disconnect the jumper from terminals PR-PX and connect the optional brake resistor
(FR-ABR) across terminals P-PR.
Connect the optional FR-BU brake unit, power return converter (FR-RC) or high power
factor converter (FR-HC).
Disconnect the jumper from terminals P-P1 〈+ -P1〉 and connect the optional power
factor improving reactor (FR-BEL).
When the jumper is connected across terminals PX-PR (factory setting),
the built-in brake circuit is valid.
(Provided for 7.5K or less.)
For grounding the inverter chassis. Must be earthed.
Turn on the STF signal to start forward rotation and turn it off to
stop. Acts as a programmed operation start signal in the
programmed operation mode. (Turn on to start and turn off to
stop.)
Turn on the STR signal to start reverse rotation and turn it off to
stop.
Turn on the STOP signal to select the self-holding of the start signal.
Use the RH, RM and RL signals as appropriate to select multiple
speeds.
Turn on the JOG signal to select jog operation (factory setting).
Jog operation can be performed with the start signal (STF or
STR).
Turn on the RT signal to select the second acceleration/
deceleration time. When the second functions such as "second
torque boost" and "second V/F (base frequency)" functions have
been set, these functions can also be selected by turning on the
RT signal.
Turn on the MRS signal (20ms or longer) to stop the inverter output.
Used to shut off the inverter output to bring the motor to a stop by the magnetic
brake.
Used to reset the protective circuit activated. Turn on the RES signal for more than
0.1 second, then turn it off.
Only when the AU signal is turned on, the inverter can be
operated with the 4-20mADC frequency setting signal.
With the CS signal on, restart can be made automatically when
the power is restored after an instantaneous power failure. Note
that this operation requires restart parameters to be set. When
the inverter is shipped from the factory, it is set to disallow restart.
Common to the contact input terminals and terminal FM. Common output terminal for
24VDC 0.1A power (PC terminal).
When transistor output (open collector output), such as a programmable controller, is
connected, connect the external power supply common for transistor output to this
terminal to prevent a fault caused by leakage current. This terminal can be used as a
24VDC, 0.1A power output. When source logic has been selected, this terminal
serves as a contact input common.
10
Description
〉. To retain the alarm
and L
1
2
-
-
〉 and apply
L
and L
L
1
11
2
21
Description
When the STF
and STR signals
are turned on
simultaneously,
the stop
command is
given.
Input terminal
function selection
(Pr. 180 to
Pr. 186) change
terminal
functions.
In
put terminal
function selection
(Pr. 180 to
Pr. 186) change
terminal
functions.

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