YASKAWA VS MINI J7 User Manual download pdf (Page 49)

To prevent shock at machine start/stop, accel/decel can be performed in S-

curve pattern.

Note : S-curve characteristic time is the time from accel/decel rate 0 to a regular accel/decel rate

determined by the set accel/decel time.

Soft-start characteristics (n20)

Setting

S-curve characteristic time

S-curve characteristic not provided

0.2 second

0.5 second

1.0 second

The following time chart shows FWD/REV run switching at deceleration to

a stop.

DC INJECTION BRAKING

TIME AT STOP

n53

MIN. OUTPUT FREQUENCY

MIN. OUTPUT

FREQUENCY n14

DECELERATION

ACCELERATION

FORWARD RUN COMMAND

REVERSE RUN COMMAND

OUTPUT FREQUENCY

ACCELERATION

n14

S-curve characteristics in

FREQUENCY

REFERENCE

OUTPUT

FREQUENCY

S-CURVE CHARACTERISTIC TIME (Tsc)

OUTPUT

FREQUENCY

TIME

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 122 123

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YASKAWA VS MINI J7 User Manual Page 49