Saf OPAL SS6 User Manual download pdf (Page 27)

OPAL SS6 Reduced Voltage Starters

Page 20

5.0 OPAL OPTION CARDS

Refer to Section 6 for typical connections of any of the options listed in this section.

5.1 SOFT STOP

CA390 - SOF T STOP CARD

This option has been designed to provide a controlled stop, to eliminate the water hammering effect

associated with fluid pumping applications.

The Soft Stop card works in the opposite fashion as the OPAL starting. When stop is commanded,

the OPAL output voltage drops to a level set by STEP, RV2, and begins to ramp down following a

rate set by the potentiometer DECEL, RV1, The OPAL will remain on until the motor terminal

vol tage has decreased to a set vol tage l evel , at whi ch ti me the starter swi tches off. The maximum

ramp time is limited to a maximum 15-20 seconds. This is the time that the relay in the OPAL

controller card, CA392, is maintained energized.

The majority of AC induction motors experience a region of instability when phased back or voltage

is reduced. The STEP potentiometer should be adjusted to a level, which is just below this point.

Fully counter-clockwise provides little decrease in voltage step when stop is commanded.

Clockwise rotation of RV1 slows the ramp down from this point.

The vol tage l evel j umper, J1, set at L O ceases starter operati on at 15% vol tage whi l e at H1, the

OPAL stops at 20% line voltage.

Terminals 1 and 2 on this option card are provided to wire an external selector switch to enable or

disable the soft stop mode. When terminals 1 and 2 of TB1 are shorted, the OPAL will coast to a

rest when stop is commanded.

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Saf OPAL SS6 User Manual Page 27