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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 145

Transistorized inverter, high function & low acoustic noise.
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·
Roles of the magnetic contactors (MC1, MC2, MC3)
Magnetic
Place of Installation
Contactor
Between
power
MC1
inverter
MC2
Between power supply and motor
MC3
Between inverter output and motor
<I/O signals>
1) When this function is used (Pr. 135 = "1"), the input signals are switched on-off as indicated below:
Signal
Terminal Used
Operation
MRS
MRS
enable/disable selection
Inverter-commercial
Depending on
CS
power supply switch-
Pr. 180 to Pr.186
over
Inverter operation
STF
STF
command (invalid for
(STR)
(STR)
commercial power
supply) (Note)
Depending on
External thermal relay
OH
Pr. 180 to Pr.186
input
Operating condition
RES
RES
initialization
·
Note:
In the above MC Operation field, [-] indicates that MC1 is on, MC2 is off and MC3 is on in inverter
operation and MC1 is on, MC2 is off and MC3 is off in commercial power supply operation.
[Unchanged] indicates that the status before signal-on or -off is held.
·
The CS signal only functions when the MRS signal is on. STF (STR) only functions when MRS and
CS are on.
·
MC1 switches off when an inverter fault occurs.
·
If the MRS signal is not switched on, neither commercial power supply nor inverter operation can be
performed.
2) The output signals are output as follows:
Signal
Terminal Used
MC1
Depending on Pr. 190
MC2
to Pr. 195
MC3
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supply
and
Normally shorted with the following exception:
Opened only when an inverter fault occurs (shorted again by resetting)
Shorted for commercial power supply operation, opened for inverter
operation
Shorted when an inverter fault occurs (selected with parameter, except
for external thermal relay operation)
Shorted for inverter operation, opened for commercial power supply
operation
Opened when an inverter fault occurs
Function
On-Off
Commercial power supply-
inverter operation enable
............................ON
Commercial power supply-
inverter operation disable
............................OFF
Inverter operation .ON
Commercial power supply
operation..............OFF
Forward (reverse) rotation
............................ON
Stop .....................OFF
Motor normal........ON
Motor fault............OFF
Initialization ..........ON
Normal operation .OFF
Description
MC1's operation signal is output
MC2's operation signal is output
MC3's operation signal is output
132
PARAMETERS
Role
{
×
MC Operation (
: ON,
: OFF)
MC1
MC2
MC3
{
{
×
Unchanged
{
{
×
{
{
×
{
{
×
{
{
×
{
×
×
×
×
Unchanged
Unchanged
{

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