Mitsubishi FR-A500 Series Instruction Manual page 151

• Roles of the magnetic contactors (MC1, MC2, MC3)
Magnetic
Contactor
Between
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
MRS MRS
Depending on
CS
Pr. 180 to Pr.186
STF STF
(STR) (STR)
Depending on
OH
Pr. 180 to Pr.186
RES RES
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.
• For the RES signal, reset input acceptance selection can be made using reset selection (Pr. 75).
2) The output signals are output as follows:
Signal Terminal Used
MC1
Depending on Pr. 190
MC2
to Pr. 195
MC3
Place of Installation
power supply and
Function
Operation
enable/disable selection
Inverter-commercial
power supply switch-
over
Inverter operation
command (invalid for
commercial power
supply) (Note)
External thermal relay
input
Operating condition
initialization
MC1's operation signal is output
MC2's operation signal is output
MC3's operation signal is output
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
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
138
PARAMETERS
Role
MC Operation (! ! ! ! : ON,
MC1 MC2

!
×
!
×
!
! !
×
!
×
!

!
× ×
×
Unchanged

!
×
: OFF)
MC3

Unchanged
!
×
!
!

×
Unchanged
