Saf OPAL SS6 User Manual download pdf (Page 28)

OPAL SS6 Reduced Voltage Starters

Page 21

5.2 SOLID STATE REVERSING

CA388 - SOLID STATE REVERSING CARD

This option provides a smooth, current controlled, motor rotation reversal without any current surge

or torque jerk. Motor stopping is not required. Additions to the OPAL include a reversing card,

CA388, plus four additional SCR's.

Terminal block AC, terminals 1 and 2 are to be connected to 115 VAC control voltage. An external

switch or contact must be connected to AC, terminals 3 and 4 of this card. The forward bridge is

selected with the switch closed. With the switch open the starter will fire the reverse bridge.

Terminal block J1 is a form C dry contact rated at 0.2A, 115 VAC for an indication of the direction

selected and by-pass contactor sequencing for a reverse/by-pass combination. The red LED, LD1

indicates the reverse selection and the green LED, LD2 annunciates that the forward bridge is

chosen.

A REVERSING DELAY TIME potentiometer, RV1, sets the time the OPAL remains off when

switching directions, from 1 to 10 seconds. Clockwise rotation increases dwell time. The factory

default setting is 1 second.

When the motor is running and the forward/reverse switch changes states, the OPAL turns all SCR's

off. After an adjustable time delay set up by RV1, the OPAL is switched back on, triggering a

different set of SCR's. This effectively switches two output lines, decelerates the motor down to

zero speed, and continues to accelerate it to full speed in the opposite direction. The motor reversal

is performed under complete current control via the RAMP and STEP potentiometers on the

CA392.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 45 46

No comments

Saf OPAL SS6 User Manual Page 28