Rotary limit switch for use on machine and ball screw actuators.
Model:
SKA Series / RLS-4139
SKA Series Rotary Limit Switch
Features
Available in two control voltage ratings : 250 or 480, and in three gear ratios.
Can be used in applications where there is a need to control equipment that rotates and/or reverses.
Sturdy and compact. Constructed of corrosion-resistant materials, with housing of black anodized aluminium.
Meets NEMA-4 water tightness requirements.
Simple to adjust, two stitches one for up/stop and one for down/stop, are activated by the adjustable limit switch nuts which travel laterally when the internal screw is rotated through gear reduction.
Operating temperature range -20° to + 150°F.
Lifetime lubricated.
Can be mounted on right or left extension of actuator worm shaft in any of four quadrants.
Optional 4-position limit switch available.
Rotary Limit Switch Performance Specifications
Model No.
Max Voltage
Max. Amps
Gear Ratios
Max. Worm Rev.
Max. Rise
Max. Allowable Drift
Notch Adjustment
AC
DC
AC
DC
SKA6000AT10
250
125
15
.50
10:1
1095
1095/TPI
24/TPI
1/TPI
SKA6000AT20
20:1
2190
2190/TPI
48/TPI
2/TPI
SKA6000AT40
40:1
4380
4380/TPI
96/TPI
4/TPI
SKA6000BT10
480
250
15
.50
10:1
750
750/TPI
29/TPI
1/TPI
SKA6000BT20
20:1
1500
1500/TPI
57/TPI
2/TPI
SKA6000BT40
40:1
3000
3000/TPI
115/TPI
4/TPI
Limit Switch Field Installation Dimensions
Worm Shaft Dimensions
Capacity
"B" Mounting Dimensions
Worm Shaft Diameter
2 & 3 Ton MS
6 3/4
.500
3 Ton MS
6 3/4
.625
5 Ton MS & BS
7 3/4
.750
10-15 Ton MS & BS
8 3/4
1.000
20 Ton MS & BS
8 3/4
1.000
25 Ton MS & BS, 35 Ton MS
10 1/4
1.375
50 Ton MS & BS
14 1/4
1.500
75 Ton MS
15 1/4
1.750
100 Ton MS
14 3/4
1.750
150 Ton MS
14 3/4
1.875
Rotary Limit Switch Electrical Wiring Diagram and Setting Instructions
CAUTION: Disconnect power before making any adjustment.
Check drift before adjusting limits.
Remove screw "A" and nut guide keeper "B" to adjust limits.
Run actuator unit to desired limit.
Rotate appropriate nut until switch clicks, then turn 1/2 turn more.
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Regarding: SKA Series Rotary Limit Switches
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SKA Series Rotary Limit Switch
Features
Available in two control voltage ratings : 250 or 480, and in three gear ratios.
Can be used in applications where there is a need to control equipment that rotates and/or reverses.
Sturdy and compact. Constructed of corrosion-resistant materials, with housing of black anodized aluminium.
Meets NEMA-4 water tightness requirements.
Simple to adjust, two stitches one for up/stop and one for down/stop, are activated by the adjustable limit switch nuts which travel laterally when the internal screw is rotated through gear reduction.
Operating temperature range -20° to + 150°F.
Lifetime lubricated.
Can be mounted on right or left extension of actuator worm shaft in any of four quadrants.
Optional 4-position limit switch available.
Rotary Limit Switch Performance Specifications
Model No.
Max Voltage
Max. Amps
Gear Ratios
Max. Worm Rev.
Max. Rise
Max. Allowable Drift
Notch Adjustment
AC
DC
AC
DC
SKA6000AT10
250
125
15
.50
10:1
1095
1095/TPI
24/TPI
1/TPI
SKA6000AT20
20:1
2190
2190/TPI
48/TPI
2/TPI
SKA6000AT40
40:1
4380
4380/TPI
96/TPI
4/TPI
SKA6000BT10
480
250
15
.50
10:1
750
750/TPI
29/TPI
1/TPI
SKA6000BT20
20:1
1500
1500/TPI
57/TPI
2/TPI
SKA6000BT40
40:1
3000
3000/TPI
115/TPI
4/TPI
Limit Switch Field Installation Dimensions
Worm Shaft Dimensions
Capacity
"B" Mounting Dimensions
Worm Shaft Diameter
2 & 3 Ton MS
6 3/4
.500
3 Ton MS
6 3/4
.625
5 Ton MS & BS
7 3/4
.750
10-15 Ton MS & BS
8 3/4
1.000
20 Ton MS & BS
8 3/4
1.000
25 Ton MS & BS, 35 Ton MS
10 1/4
1.375
50 Ton MS & BS
14 1/4
1.500
75 Ton MS
15 1/4
1.750
100 Ton MS
14 3/4
1.750
150 Ton MS
14 3/4
1.875
Rotary Limit Switch Electrical Wiring Diagram and Setting Instructions
CAUTION: Disconnect power before making any adjustment.
Check drift before adjusting limits.
Remove screw "A" and nut guide keeper "B" to adjust limits.
Run actuator unit to desired limit.
Rotate appropriate nut until switch clicks, then turn 1/2 turn more.
