Omron SYSDRIVE 3G3MV - Page 135

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S1: RUN input (RUN when ON)
S2: STOP input (STOP when OFF)
S3: Forward/Reverse rotation command (OFF: Forward; ON: Reverse)
·The following diagram shows a wiring example of the terminals in 3-wire sequence.
Stop
switch
(NC)
RUN
switch
(NO)
Direction switch
RUN input (Operates with the RUN switch closed)
Stop input (Stops with the stop switch opened)
Forward/Reverse rotation command (forward with
the direction switched opened)
Sequence input common
H External Base Block Command (Set Value: 12, 13)
WhenanSPST-NO(setvalue:12)orSPST-NC(setvalue:13)inputisreceived,Inverter
outputs are shut OFF. Use these inputs in the following cases to stop Inverter outputs.
· For switching the motor to free running status when applying an external brake.
· For stopping Inverter outputs before disconnecting motor wiring when changing the
motor from an Inverter to a commercial power supply.
Note TheexternalbaseblockonlyshutsOfftheInverter’soutputfrequency,andtheInverter’s
internal frequency continues to be calculated as usual. Therefore, if the external base
blockisclearedwhenthefrequencyisnotzero,thefrequencycalculatedatthatpointwill
beoutput.Becauseofthis,ifthebaseblockisclearedduringdecelerationwhilethemotor
is free running, a large discrepancy between the motor speed at that moment and the
Inverter output frequency may result in a main circuit overvoltage (OV) or overcurrent
(OC).
Basic Operation Chapter 5