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Mitsubishi Electric FR-A500 Instruction Manual Page 154

Transistorized inverter.
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• Roles of the magnetic contactors (MC1, MC2, MC3)
Magnetic
Place of Installation
Contactor
MC1
Between power supply and 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 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
MC1
Depending on Pr. 190
MC2
to Pr. 195
MC3
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
Commercial power supply-
inverter operation enable
Operation enable/
..................................ON
disable selection
Commercial power supply-
inverter operation disable
..................................OFF
Inverter operation ON
Inverter-commercial
Commercial power supply
power supply switchover
operation................OFF
Inverter operation
Forward (reverse) rotation
command (invalid for
..................................ON
commercial power
Stop..........................OFF
supply) (Note)
External thermal relay
Motor normal..........ON
input
Motor fault................OFF
Operating condition
Initialization.............ON
initialization
Normal operation...OFF
Description
MC1's operation signal is output
MC2's operation signal is output
MC3's operation signal is output
145
Role
MC Operation ( :ON, ×:OFF)
On-Off
MC1
×
Unchanged
PARAMETERS
MC2
MC3
×
Unchanged
×
×
×
×
×
×
×
Unchanged
4

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    good manual and it is very good to understand the contant of inverter and i lernt many things in this manual