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PARAMETERS
129
•
Roles of the magnetic contactors (MC1, MC2, MC3)
Magnetic
Contactor
Place of Installation Role
MC1
Between power supply and
inverter
Normally shorted with the following exception:
Opened only when an inverter fault occurs (shorted again by resetting)
MC2 Between power supply and motor
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)
MC3 Between inverter output and motor
Shorted for inverter operation, opened for commercial power supply
operation
Opened when an inverter fault occurs
<I/O signals>
1) When this function is used (Pr. 135 = "1"), the input signals are switched on-off as indicated below:
MC Operation ($
$$
$: ON, ×
××
×: OFF)
Signal Terminal Used Function On-Off
MC1 MC2 MC3
MRS MRS
Operation
enable/disable selection
Commercial power supply-
inverter operation enable
........................ON
Commercial power supply-
inverter operation disable
........................OFF
$
$
×
Unchanged
CS
Depending on
Pr. 180 to Pr.186
Inverter-commercial
power supply switch-
over
Inverter operation
........................ON
Commercial power supply
operation .........OFF
$
$
×
$
$
×
STF
(STR)
STF
(STR)
Inverter operation
command (invalid for
commercial power
supply) (Note)
Forward (reverse) rotation
........................ON
Stop.................OFF
$
$
×
×
$
$
OH
Depending on
Pr. 180 to Pr.186
External thermal relay
input
Motor normal ...ON
Motor fault .......OFF
$
×
×
×
RES RES
Operating condition
initialization
Initialization......ON
Normal operation
........................OFF
Unchanged
$
×
Unchanged
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 on 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 Description
MC1 MC1's operation signal is output
MC2 MC2's operation signal is output
MC3
Depending on Pr. 190
to Pr. 195
MC3's operation signal is output
4