Application
Gemco’s Rotary Limit Switches are primarily used for machine tools,
handling devices, and rotary operators where motion is expressed in
shaft rotation. The primary purpose of the switch is to control the
intermediate or end limits of a linear or rotary motion. The switch is
often used as a safety device to protect against accidental damage to
equipment.
Description
Quality parts make each Rotary Limit Switch highly dependable.
• The 1/2” input shaft (includes Woodruff Key) drives a bronze gear
which rotates the cam block. The cam block houses independently
adjustable cams that actuate the precision type snap action
switches.
• Each switch can be provided with one to four single pole, double
throw switches or a maximum of two double pole, double throw
switches for versatility of control circuits.
• No minimum speed is specified because snap action contacts are
used. Maximum rated speed of the worm shaft is 1000 RPM and
can be rotated clockwise or counterclockwise.
• Gemco’s Rotary Limit Switch offers the broadest range of standard
gear selections of any switch available. Standard ratios range from
5:1 through 5333.3:1.
• Max. Operating Temperature 180°F
Enclosures
NEMA Type 1 and 12 (General Purpose) enclosures are molded from
FIBRALLOY® a special fiber glass material that is resistant to acids,
alcohols, hydro carbons and heat. A tight fitting synthetic gasket
prevents the entrance of oil and coolants. External mounting holes
enable switch mounting without internal interference. (See Figures 1
and 2.)
NEMA Type 4 (Watertight) enclosures are made of cast aluminum;
cast iron or cast bronze enclosures can be provided upon request.
NEMA Type 7 & 9 (Hazardous Location) enclosures are designed to
meet the requirements of the National Electrical Code for Class 1,
Group D, and Class 2.
Groups E, F & G. The enclosures are made of
cast aluminum; cast iron or bronze enclosures
can be provided upon request. (See Figure 3.)
Rotary Limit Switches
often pays for itself by eliminating cost of stampings
When the cam rotates, the switches "E" and "F" are actuated and the contacts
check these advantages.... worm gear type
The GEMCO Rotary Limit Switch
• reduces hazards to inexperienced users.
• removes danger of terminal shorting from water,
corrosion, or accidental shorting from other metal
objects because of its insulating properties.
• enclosures are made of FIBRALLOY® -- an electrical
insulator.
The GEMCO Rotary Limit Switch.
• reduces design time.
• reduces machine work on special cams and gears
for different operating ratios.
• cams are all standard regardless of ratios.
• offers special cams upon request.
The GEMCO Rotary Limit Switch.
•
and machined bushings in linkages.
• reduces assembly time.
Mounting
The switch may be mounted in any convenient position. An "L" shaped mounting bracket which permits innumerable
mounting positions for all enclosures, can be supplied upon request.
Adjustment
• Front cam "A"actuates switch "F";
rear cam "0" actuates switch "E".
• Both switches "E" and "F" have
independent adjustable cams.
• To adjust cam "A" loosen Allen
Screw "B".
• To adjust cam "0" loosen Allen
Screw "C".
change from the normally closed to open position and normally open to the
closed position.
worm gear type
.....plus a broad range of application
mechanical presses
Both die and press, worth thousands
the cost of the Gemco Rotary Limit
Switch, are safely protected when the
connecting rod length is adjusted.
loaders
You can control travel of
pushers, grabs, and other
reciprocating parts
handlers directly from
drive shafts.
One or more open and close
limits on pipe line, pumping
station and machinery valves
are accurately controlled with
Gemco Rotary Limit
Switches.
door operators
The Gemco Rotary Limit Switch is mounted on
the drive unit, with gear take-off from the main
drive shaft. Much wiring is eliminated. Cam
accuracy maintains door closing to practical limits.
valves
handling fixtures
Assures accurate movement
and placement of parts, plus
control of mechanical
clamping in welding,
induction heating or
machining fixtures.
hoists
Gemco switches on this line of hoists
protect power unit from damage by
controlling critical upper and lower limit.
windows
Gemco Rotary Limit Switches
are used for window
operators in skylights and
monitors, for central station
control.
motor operated valves
packaging machinery
tapping heads
elevating mechanisms
pipe threading machines
index tables
transformer tap changers
conveyors
Max Speed — 1000 RPM worm gear type
Input
Shaft
Rev.
Cam
Block
Rev.
5
10
20
30
40
50
60
80
100
150
250
300
500
600
1000
2000
4000
53333
Input
Shaft
Rev.
Cam
Block
Rev.
5
10
20
30
40
50
60
80
100
150
250
300
500
600
1000
2000
4000
5333.3
NEMA 1* & 12
Encl.
Catalog No. Catalog No. Catalog No. Max.
1 2000-1B
2000-38B
2000-2B
1 2000-3B
2000-4B
2000-5B
1 2000-6B
2000-7B
2000-8B
1 2000-129B
2000-28B
2000-130B
1 2000-29B
2000-131B
2000-30B
1 2000-292B
2000-279B
2000-281B
NEMA 1* & 12
Encl.
Catalog No. Catalog No. Catalog No. Max.
1 2000-137B
2000-138B
2000-25B
1 2000-47B
2000-139B
2000-73B
1 2000-75B
2000-77B
2000-43B
1 2000-1130B
2000-140B
2000-1133B
1 2000-141B
2000-1136B
2000-142B
1 2000-1139B
2000-1142B
2000-1145B
NEMA 4 Encl.
(1)
2000-98
2000-39B
2000-10B
2000-11B
2000-12B
2000-13B
2000-14B
2000-15B
2000-16B
2000-132B
2000-31B
2000-133B
2000-32B
2000-134B
2000-33B
2000-299B
2000-127B
2000-157B
NEMA 4 Encl.
(1)
2000-145B
2000-146B
2000-147B
2000-148B
2000-149B
2000-1508
2000-151B
2000-152B
2000-153B
2000-1131B
2000-154B
2000-1134B
2000-155B
2000-1137B
2000-156B
2000-1140B
2000-1143B
2000-1146B
NEMA 7 Encl.
(1)
2000-17B
2000-40B
2000-18B
2000-198
2000-20B
2000-21B
2000-22B
2000-23B
2000-24B
2000-135B
2000-34B
2000-136B
2000-35B
2000-43B
2000-36B
2000-291B
2000-128B
2000-158B
NEMA 7 Encl.
(1)
2000-159B
2000-160B
2000-161B
2000-60B
2000-1628
2000-163B
2000-164B
2000-165B
2000-166B
2000-1132B
2000-167B
2000-1135B
2000-168B
2000-1138B
2000-169B
2000-1141B
2000-1144B
2000-1147B
Input Shaft
Turns****
Setting
4 1/2
9 1/4
18
28
37
46
58
77
94
135
230
265
460
555
920
Consult
Factory
Input Shaft
Turns****
Setting
4 3/4
9 1/4
19
28 1/2
37 3/4
46 3/4
58
75
95
135
237
265
460
555
920
Consult
Factory
To
Reset
1/16
18
1/8
1/4
1/4
1/4
1 1/2
3/4
3/4
4
6
6 1/2
15 1/4
16
29
To
Reset
1/8
1/4
1/2
1/2
3/4
3/4
1 1/2
1 3/4
2
4
6
61 1/2
15 1/4
16
29
Input
Shaft
Rev.
Cam
Block
Rev.
5
10
20
30
40
60
80
100
150
250
300
500
600
1000
2000
4000
5333.3
Input
Shaft
Rev.
Cam
Block
Rev.
NEMA 1* & 12
Encl.
Catalog No. Catalog No. Catalog No. Max.
1 2000-174B
2000-175B
2000-176B
1 2000 177B
2000 178B
2000 179B
1 2000-180B
2000-181B
2000-182B
1 2000-170B
2000-183B
2000-187B
1 2000 184B
2000-1100B
2000-185B
1 2000-1103B
2000-1106B
2000-1109B
NEMA 1* & 12
Encl.
Catalog No. Catalog No. Catalog No. Max.
*Switch capacities: 125V. - 15 amps. AC., 1/2 amp. D.C.
15 amps. AC.. 1/4 amp. D.C.
460V. 15 amps. AC.
**Switch capacities: 125 or 250V. AC. - 10 amps.
125V. D.C. - 1/2 amp.
250V. D.C. - 1/4 amp.
(1) — For Cast Iron or Bronze Enclosure Contact Factory.
5
10
20
30
40
50
60
80
100
150
250
300
500
600
1000
2000
4000
5333.3
1 2000-89B
2000-90B
2000-91B
1 2000-92B
2000-93B
2000 94B
1 2000-95B
2000-96B
2000-97B
1 2000-1112B
2000-98B
2000-1115B
1 2000-99B
2000-1118B
2000-100B
1 2000-1121B
2000-1124B
2000-1127B
NEMA 4 Encl.
(1)
NEMA 7 Encl.
(1)
Input Shaft
Turns****
To
2000-188B
2000-189B
2000-190B
2000-191B
2000 192B
2000 193B
2000-194B
2000-195B
2000-196B
2000-171B
2000-197B
2000-300B
2000 198B
2000-1101B
2000-199B
2000-104B
2000-1107B
2000-11108
NEMA 4 Encl.
(1)
2000-263B
2000-264B
2000-265B
2000-266B
2000 267B
2000 268B
2000-269B
2000-270B
2000-271B
2000-186B
2000-272B
2000-301B
2000 273B
2000-1102B
2000-274B
2000-1105B
2000-1108B
2000-1111B
NEMA 7 Encl.
(1)
Setting
4 3/4
9 1/2
19 1/4
28 1/2
38
47
57 12
76 3/4
96 1/4
135
234
265
460
555
920
Input Shaft
Reset
1/16
116
1/8
1/4
1/2
1/2
12
12
1 12
4
2
6 1/2
7
16
10
Consult
Factory
Turns****
To
Setting
2000-101B
2000-102B
2000-103B
2000-104B
2000-105B
2000 106B
2000-107B
2000-1 088
2000-109B
2000-1113B
2000-110B
2000-1116B
2000-111B
2000-1119B
2000-112B
2000-1122B
2000-1125B
2000-1128B
***Switch capacities: 250V.
Mechanical rating - 20 million cycles
Electrical rating - 125V. AC. - 10 amps. resistive load.
250V. AC. - 10 amps. resistive load
30V. D.C. - 7 amps. inductive load
****Figures are based on a switch using a standard 25' cam:
maximum setting between limits.
2000-113B
2000-114B
2000-115B
2000-1 1 6B
2000-117B
2000-118B
2000-119B
2000-1 20B
2000-121B
2000-1114B
2000-122B
2000-1117B
2000-123B
2000-1120B
2000-124B
2000-1123B
2000-1 126B
2000-1129B
434
9 12
19 14
28 1/2
36
47
57 1/2
76 3/4
96 1/4
135
234
265
460
555
920
Reset
1/16
1/16
18
1
12
1 2
1/2
1/2
1 1/2
4
2
61/2
7
16
10
Consult
Factory
worm gear type
not listed, can be furnished on special order. When ordering, please
recommend the most suitable Gemco Rotary Limit Switch for your needs. Custom designed switches are
Special Cams*
Cam**
Part No.
S-55-A Standard 25° or 335°
S-68-A Special 540° or 306°
S-84-A Special 75° or 285°
S-69-A Special 90° or 270°
S-85-A Special 105° or 255°
S-86-A Special 135° or 225°
S-87-A Special 150° or 210°
S-70-A Special 180°
S-71-A Special 240° or 120°
S-127-A Special 360° Blank Cam
*Special cams
Ordering
When ordering desired switch, specify:
1. Catalog Number
3. Desired Gear Ratio
2. Number of Cams
4. Type of Enclosure
Example: If a four circuit standard enclosure, 5:1, is required with four 900 cams, order Catalog No.
2000-89 with four Part No. S-69-A Cams. See Special Cam Chart above.
specify cam angle.
Period for which switch contacts
are opened or closed
In selecting a gear ratio, maximum accuracy and ease of adjustment are more easily obtained if full
travel of drive equals, or is less than maximum setting between limits.
Example: If 90 revolutions of a window drive opens a window, a gear ratio of 100:1 should be selected.
Design Service
Gemco Design Engineers will be pleased to assist in the solution of any special control problems and to
available to specifications.
spur gear type
Superior Design and
Operating Features
Rotary Limit Switches
Application spur gear type
GEMCO's Spur Gear Type Rotary Limit Switch is used in applications
requiring ratios below 3:1 and 1:3 for controlling the end and/or
intermediate limits of reciprocating or rotary motion. This device
extends the present line of Gemco Rotary Limit Switches by providing
ultra-sensitive control for small increments of motion.
Many beneficial features include:
• Control of motor-operated valves, dampers and hopper gates used
in pipe lines, ventilating equipment and material handling systems.
• Improved environmental conditions for longer switch life.
• Smaller space requirements.
• Material and labor savings of reduced drilling, tapping, piping, and
wiring.
• Economies afforded when Gemco units are applied for many short
travel end limit uses instead of conventional lever operated limit
switches actuated by cams or dogs.
• Unique mounting which permit these switches to be installed in
convenient mounting positions. Mounting holes are provided for either
direct or sprocket drive applications in three different positions.
Description
The basic switch units are actuated by independently adjustable
cams which are driven by the input shaft. All cams are mounted on a
common block, which is directly coupled or geared to the drive shaft.
• Ratios
Standard geared ratios between the input shaft and cam block are
1:1, 1/2:1, 1/3:1, 2:1, and 3:1. The 1:1 ratio may be supplied with a
potenti-ometer gear coupled to the input shaft with ratios of 1:1, 1:2
and 1:3.
• Long Life Switches
Each enclosure can accommodate from two to four S.P.D.T.
switches. All switches are provided with silver to silver
contacts for reliability along with screw type terminals,
Figure 5 Sketch showing:
• independent adjustable cams A-D
• switches E-F
• Allen screws B-C for cam adjustment
Mounting
Unique mounting features permit these switches to be
installed in any of three different positions. Mount-ing holes
are provided for either direct or sprocket drive applications.
Adjustment
• Top cam ‘A' actuates switch ‘F'; bottom cam ‘D' actuates
switch ‘E'.
• Adjustment of cam ‘A' is independent of cam ‘D'.
• To adjust cam ‘A', loosen cam locking screw ‘C' and rotate
cam ‘A' until trip point of switch ‘F' is reached.
• To adjust cam ‘D', loosen cam locking screw ‘B' and rotate
cam ‘D' until trip point of switch ‘E' is reached.
When the cams rotate, the switches are actuated and the
contacts change from the normally closed to open position.
(See Figure 5.)
spur gear type
Rotary Limit Switches
Enclosures
NEMA Type 1 and 12 (General Purpose) enclosures consist of a die cast
housing and FIBRALLOY® cover. All mounting holes are external to the
wiring cavity eliminating interference with internal wiring when the switch
is mounted. Captive screws fasten the cover to the die cast housing and
eliminate problems of misplaced screws. (See Figure 6.)
NEMA 4 and 7 enclosures are constructed of aluminum to prevent
corrosion. The NEMA 7 (Hazardous Location) enclosure is available for
use in Class 1, Group D, areas as outlined in the National Electrical
Code. Cast iron enclosures can also be provided on special request. All
units are provided with an attractive red wrinkle finish. (See Figure 7.)
Potentiometer
An optional salient feature of mounting a 2 watt potentiometer within the
enclosure, and gear coupled to the input shaft, is offered. This feature
permits the potentiometer to be used as a remote position indicator or as
a constant output auxiliary control device for open or closed loop
feedback systems. (See Figure 8.)
• Step-up geared ratios between the input shaft and the potentiometer
are available to provide a choice of sensitivity and resolution to meet
most applications.
• The special type potentiometer allows continuous rotation of the drive
and a zero or reference point to be adjusted without removing any gears
or components.
SG Type....
....Rotary Application
• reciprocating motions
Assures accurate movement and placement of parts in
all types of handling and positioning fixtures.
NOTE - Replaces two limit switches and electrical
piping.
Rotary Limit Switches
spur gear type - ROTARY LIMIT SWITCH
Enclosure
Type
NEMA 1 & 12
NEMA 4
(1)
NEMA 7
(1)
Enclosure
Type
NEMA 1 & 12
NEMA 4
NEMA 7
Ordering
When ordering desired switch, specify:
1. Catalog Number
2. Quantity Required
Input
Shaft
Rev.
1
1
1
1
1
1
1
1
1
Input
Shaft
Rev.
Cam
Block
Rev.
Cam
Block
Rev.
1
1/2
1/3
2
3
1
1/2
1/3
2
3
1
1/2
1/3
2
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
ROTARY LIMIT SWITCH WITH POTENTIOMETER
Pot.
Rev.
1
2
3
1
2
3
1
2
3
(1) Contact Factory for Cast Iron or Bronze Enclosure.
Two Circuit
S. P. D. T.
Symbol A
Catalog
Number
2000-800
2000-801
2000-802
2000-803
2000-804
2000-832
2000-833
2000-834
2000-835
2000-836
2000-864
2000-865
2000-866
2000-867
2000-868
Two Circuit
S. P. D. T.
Symbol A
Catalog
Number
2000-820
2000-821
2000-822
2000-852
2000-853
2000-854
2000-884
2000-885
2000-886
Two Circuit
D. P. D. T.
Symbol B
Catalog
Number
2000-805
2000-806
2000-807
2000-808
2000-809
2000-837
2000-838
2000-839
2000-840
2000-841
2000-869
2000-870
2000-871
2000-872
2000-873
Two Circuit
D. P. D. T.
Symbol B
Catalog
Number
2000-823
2000-824
2000-825
2000-855
2000-856
2000-857
2000-887
2000-888
2000-889
3. Desired Gear Ratio
4. Resistance of Potentiometer (if used)
Three Circuit
S. P. D. T.
Symbol C
Catalog
Number
2000-810
2000-811
2000-812
2000-813
2000-814
2000-842
2000-843
2000-844
2000-845
2000-846
2000-874
2000-875
2000-876
2000-877
2000-878
Three Circuit
S. P. D. T.
Symbol C
Catalog
Number
2000-826
2000-827
2000-828
2000-858
2000-859
2000-860
2000-890
2000-891
2000-892
Four Circuit
S.P. D. T.
Symbol C
Catalog
Number
2000-815
2000-816
2000-817
2000-818
2000-819
2000-847
2000-848
2000-849
2000-850
2000-851
2000-879
2000-880
2000-881
2000-882
2000-883
Four Circuit
S. P. D. T.
Symbol C
Catalog
Number
2000-829
2000-830
2000-831
2000-861
2000-862
2000-863
2000-893
2000-894
2000-895
Heavy-Duty Dimensions
Application:
Ruggedly built, GEMCO'S heavy duty Rotary Limit
Switches have gained wide acceptance on
installations such as mechanical press ram
adjustments, press extractors and shuttles which
require dependable trouble free performance.
These installations require a limit switch that will
withstand rapid starting and stopping, shock,
vibration and still successfully control the end or
intermediate limits of such devices. Because of
these demands and the high reliability required,
GEMCO'S heavy-duty Rotary Limit Switch far
exceeds any on the market.
Cams
The input shaft (includes Woodruff Key) drives a bronze gear which rotates the cam block. The cam block houses independently
adjustable cams that actuate the precision type snap action switches.
Input Speed
Maximum rated speed of the input Input Speed shaft is 1800 RPM; can be rotated clockwise or counterclockwise.
Reduction
Ratios
Two Circuit
S.P.D.T. -
Symbol A*
Two Circuit
D.P.D.T. -
Symbol B*
Three Circuit
S.P.D.T. -
Symbol C*
Four Circuit
Symbol C*
S.P.D.T. -
Catalog No. Catalog No. Catalog No. Catalog No.
5:1
7.5:1
Dwg.
No. D-96-C
Dwg.
No. D-85-C
* For switch capacities, see page 13
For Cast Iron or Bronze Enclosure Contact Factory.
10:1
15:1
20:1
30:1
125:1
156.25:1
187.5:1
250:1
312.5: 1
375:1
500:1
625:1
750:1
1000:1
1250:1
1500:1
2000:1
2500:1
3000:1
2000-2000
2000-2001
2000-2002
2000-2003
2000-2004
2000-2005
2000-2024
2000-2025
2000-2026
2000-2027
2000-2028
2000-2029
2000-2030
2000-2031
2000-2032
2000-2033
2000-2034
2000-2035
2000-2036
2000-2037
2000-2038
2000-2006
2000-2007
2000-2008
2000-2009
2000-2010
2000-2011
2000-2039
2000-2040
2000-2041
2000-2042
2000-2043
2000-2044
2000-2045
2000-2046
2000-2047
2000-2048
2000-2049
2000-2050
2000-2051
2000-2052
2000-2053
2000-2012
2000-2013
2000-2014
2000-2015
2000-2016
2000-2017
2000-2054
2000-2055
2000-2056
2000-2057
2000-2058
2000-2059
2000-2060
2000-2061
2000-2062
2000-2063
2000-2064
2000-2065
2000-2066
2000-2067
2000-2068
2000-2018
2000-2019
2000-2020
2000-2021
2000-2022
2000-2023
2000-2069
2000-2070
2000-2071
2000-2072
2000-2073
2000-2074
2000-2075
2000-2076
2000-2077
2000-2078
2000-2079
2000-2080
2000-2081
2000-2082
2000-2083
Heavy-Duty Dimensions
General Purpose Rotary Limit Switches
Featuring:
• S.P.D.T. or D.P.D.T. Industrial Duty Switches With Isolated
Contacts
• Ease of Wiring With Direct Access To All Switch Terminals
• Gear Ratios From 5:1 to 1080:1
• Positive, Independent Cam Settings
• Rugged Duty Die Cast Enclosures
• Large Cover Openings For Ease of Wiring
• NEMA 4 & 5 Oiltight - Watertight - Dusttight
"L" SHAPE BRACKET
When "L" Shape Bracket is purchased, use
CATALOG NUMBER
C-6131-B (2 circuit unit)
C-6132-B (4 circuit unit)
Circuits
2 Circuit Enclosure 4 7/8 4 1/2 2 5/8 4 3/8 5 1/4
4 Circuit Enclosure 6 7/8 5 3 3/8 6 3/8 5 7/32
Dimensions in inches
A B C D E
Includes half inch hub extension.
Lbs.
Boxed
4 1/2
Approximate Dimensions And Shipping Weights For 2 and 4 Circuit Units
Left Hand Extension Shown
3
("L" shape mounting bracket, when purchased separately, is shown in some of the
possible mounting positions by broken lines.)
ELECTRICAL CONTACT RATINGS
Switch
Type
1950-1-B-A-D0 SPDT
1950-4-B-A-D0 DPDT
Contacts Volts
Pilot Duty 35% Power Factor
Make Break
Amps VA Amps VA
110 40 …. 15 …. 15 15 115 0.25 15
220 20 …. 10 …. 15 15 230 0.1 15
440 10 …. 6 …. 15 15 600 …. 15
600 8 …. 5 …. 15 15 …. …. ….
115 30 3450 3 345 10 10 115 0.2 10
230 15 3450 1.5 345 10 10 230 0.1 10
440 7.5 3450 0.75 345 10 10 600 …. 10
575 6 3450 0.6 345 10 10 …. …. ….
Inductive
NOTE: The maximum period for which the switch contacts are opened or closed during one revolution (360°) of the cam
block assembly is 25° or 335°. Multiply the Rotary Limit Switch gear ratio times 25° or 335° to obtain the input shaft rotation
which will yield 25° or 335° of cam block rotation.
AC DC
Continuous
Carrying
Amps
Resistive
75% Power Factor
Make, Break and
Continuous
Carrying Amps
Volts
Inductive Pilot Duty
and Resistive
Make and
Break Amperes
Double Throw
Continuous
Carrying
Amps
Precision rugged duty snap action switches, combined with a
hand or right hand
APPLICATION:
The Type K Rotary Limit Switch is used in applications
requiring ratios from 5:1 to 1080:1 for controlling the end
and/or intermediate limits of a reciprocating or rotary
motion. Two circuit and four circuit assemblies are
available from stock.
The NEMA 4 & 5 enclosure provides a clean environmental condition for the industrial duty snap action
switches. Where motion can be expressed in shaft
rotation either through a roller chain, gear train or direct
coupling, the Type K Rotary Limit Switch makes it
possible to open or close up to four independent circuits
at the desired angular positions.
DESCRIPTION:
wide selection of gear ratios provides reliable electrical
signals as a function of the shaft rotation. No minimum
speed is specified due to the snap action contacts of the
switch. The cam settings and the switch wiring can be easily
accomplished through the full size cover.
With the two circuit assembly, either a left
shaft extension can be supplied. This pro-vides the added
versatility when packaging this assembly in hard-to-get-at
locations.
TYPICAL APPLICATIONS ARE:
• Door Operators
• Hoists
• Valves
• Elevating Jack
Mechanisms
• Tapping Heads
• Packaging
• Machinery
• Conveyors
• Index Tables
• Material Handling Equipment
• Reciprocating Linear Actuators
• Dampers
• End Limits on Machine Tool
Lead Screws
• Shuttles
Industrial Duty Switches
With Isolated Contacts
Contact positions shown are when cams ARE NOT actuating levers.
DESCRIPTION
This rotary limit switch is designed to control the limits of travel of rotating reversing
equipment. The limit switch input shaft is connected to a worm gear. Adjustable self
lubricating nylon roller cams are concentrically mounted to the worm gear. These adjustable
cams actuate the precision limit switches by utilizing a lever assembly.
INSTALLATION
This limit switch may be mounted in any convenient position. when installed this limit switch
will provide long life with a minimum amount of service maintenance.
The following recommendations will prove helpful.
1. Install the limit switch so that the shaft load will not exceed (5) live pounds.
2. A flexible coupling is recommended for all installation other than gear drive
application.
3. Coupling should be employed in a manner that results in a minimum of thrust
loading on the shaft. If switches are mounted with the shaft up or down, some
additional thrust loading resulting from the weight of the shaft plus a very light
coupling is permissible.
4. Whenever possible, a separate support bearing for the drive sprocket should be
used.
5. Permissible speed of the input shaft 2000 R.P.M.
LUBRICATION
This limit switch was lubricated at the factory and should not require lubrication for the life of
the switch.
ADJUSTMENT
Refer to figure 1. The electrical switch units “G” and “H” are shown with the contact positions
assumed when the cams are not actuating the switch units.
When the cam rotates and actuates the switch, the “B” (closed) contact opens and the “A”
(open) contact closes. Each precision switch has (1) one independent adjustable cam.
TO ADJUST SWITCH "G"
1. Loosen Red Set
Screw
2. Turn "D" to Trip "H"
3. Tighten Green Set
Screw
TO ADJUST SWITCH "H"
1. Loosen Blue Set
Screw
2. Turn "C" to Trip "G"
3. Tighten Yellow Set
Screw
WARNING:
LOOSEN CAM SET
SCREW BEFORE
ADJUSTING OR
DAMAGE OF CAMS
WILL OCCUR
Nominal Input
Shaft to Cam
Ratio
5:1
10:1
20:1
30:1
40:1
60:1
80:1
120:1
RENEWAL PARTS
When ordering Renewal Parts give this form No. PF-047, Item No., Description,
Part No., Quantity, and the Complete Unit Number stamped on the label.
Reference FIG. #1 and FIG. #2 above.
ITEM DESCRIPTION PART NUMBER QTY.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Maximum Minimum Over Travel To Reset
4
8-1/2
17
26
35
53
72
108
Case and Shaft assembly
Cam block & Worm Gear assy.
Shim Cam Block (.080 THK.)
Shim Cam Block (.020 THK.)
Shim Cam Block (.016 THK.)
Limit Switch Standard S.P.D.T.
Optional D.P.D.T.
Optional S.M.S.B.
Adjusting Bracket Assembly
Gear and Roller Assembly
Spring, Compression
Lever Assembly
Cover
Cover Gasket
Spacer Center Post
Woodruff Key (#404)
5:1 Ratio
10:1 Ratio
20:1 Ratio
30:1 Ratio
40:1 Ratio
60:1 Ratio
80:1 Ratio
120:1 Ratio
5:1 Ratio
10:1 Ratio
20:1 Ratio
30:1 Ratio
40:1 Ratio
60:1 Ratio
80:1 Ratio
120:1 Ratio
Turns of Input Shaft
1/8
1/4
1/2
1
1
2
2-1/2
3
1/8
1/4
1/2
3/4
1
2
2-1/2
3
PSD-0092400-DN
PSD-0092500-DN
PSD-0092600-DN
PSD-0092700-DN
PSD-0092800-DN
PSD-0092900-DN
PSD-0093000-DN
PSD-0093100-DN
PSD-0093500-DN
PSD-0093600-DN
PSD-0093700-DN
PSD-0093800-DN
PSD-0093900-DN
PSD-0094000-DN
PSD-0094100-DN
PSD-0094200-DN
PS-0003300-A
PS-0000800-A
PS-0003200-A
1950-1-B-A-DO
1950-4-B-A-DO
1950-1408
PSD-0024700-B
PSD-00904-00-A
PM-001 8000-A
PSD-0024500-A
PC-0069200-A
PS-0001 000-A
M-0073000-A
04-56401 9-DN
1/16
1/8
1/4
3/8
1/2
3/4
1
1-1/2
1
....
....
....
....
....
....
....
....
1
....
....
....
....
....
....
....
....
1
1
3
4
....
....
1
4
4
2
1
1
1
1
Contact positions shown are when cams ARE NOT actuating levers.
Nominal
Input Shaft
to Cam Ratio
5:1
10:1
20:1
30:1
40:1
60:1
80:1
120:1
Turns of Input Shaft
Maximum Minimum Over Travel To Reset
4
8-1/2
17
26
35
53
72
108
1/8
1/4
1/2
1
1
2
2-1/2
3
1/8
1/4
1/2
3/4
1
2
2-1/2
3
1/16
1/8
1/4
3/8
1/2
3/4
1
1-1/2
DESCRIPTION
This rotary limit switch is designed to control the limits of travel of rotating reversing
equipment. The limit switch input shaft is connected to a worm gear. Adjustable selflubricating nylon roller cams are concentrically mounted to the worm gear. These
adjustable cams actuate the precision limit switches by utilizing a lever assembly.
INSTALLATION
This limit switch maybe mounted in any convenient position. When installed this limit
switch will provide long life with a minimum amount of service maintenance.
The following recommendations will prove helpful.
1. Install the limit switch so that the shaft load will not exceed (5) live pounds.
2. A flexible coupling is recommended for all installation other than gear drive
application.
3. Coupling should be employed in a manner that results in a minimum of
thrust loading on the shaft. If switches are mounted with the shaft up or
down, some additional thrust loading resulting from the weight of the shaft
plus a very light coupling is permissible.
4. Whenever possible, a separate support bearing for the drive sprocket
should be used.
5. Permissible speed of the input shaft 2000 R.P.M.
LUBRICATION
This limit switch was lubricated at the factory and should not require lubrication for the
life of the switch.
ADJUSTMENT
Refer to figure 1. The electrical switch units “G”, “H' , “L” AND “M” are shown with the
contact positions assumed when the cams ARE NOT actuating the switch units.
When the cam rotates and actuates the switch, the “B” (closed) contact opens and the
“A” (open) contact closes. Each precision switch has (1) one independent adjustable
cam.
TO ADJUST SWITCH "M"
1. Loosen Red Set Screw
2. Turn "K" to Trip "M"
3. Tighten Red Set Screw
TO ADJUST SWITCH "H"
1. Loosen Green Set Screw
2. Turn "D" to Trip "H"
3. Tighten Green Set Screw
WARNING: LOOSEN CAM SET SCREW BEFORE ADJUSTING OR DAMAGE
OF CAMS WILL OCCUR
TO ADJUST SWITCH "L"
1. Loosen Blue Set Screw
2. Turn "J" to Trip "L"
3. Tighten Blue Set Screw
TO ADJUST SWITCH "G"
1. Loosen Yellow Set Screw
2. Turn "C" to Trip "G"
3. Tighten Yellow Set Screw
QTY.
1
....
....
....
....
....
....
....
....
1
....
....
....
....
....
....
....
....
1
1
3
4
....
....
1
4
4
2
1
1
1
1
RENEWAL PARTS
When ordering Renewal Parts give this form No. PF-047, Item No.,
Description, Part No., Quantity, and the Complete Unit Number stamped on
the label. Reference FIG. #1 and FIG. #2 above.
ITEM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
DESCRIPTION
Case and Shaft assembly
10:1 Ratio
20:1 Ratio
30:1 Ratio
40:1 Ratio
60:1 Ratio
80:1 Ratio
Cam block & Worm Gear assy.
Shim Cam Block (.080 THK.)
Shim Cam Block (.020 THK.)
Shim Cam Block (.016 THK.)
Limit Switch Standard S.P.D.T.
Optional D.P.D.T.
Optional S.M.S.B.
Adjusting Bracket Assembly
Gear and Roller Assembly
Spring, Compression
Lever Assembly
Cover
Cover Gasket
Spacer Center Post
Woodruff Key (#404)
120:1 Ratio
10:1 Ratio
20:1 Ratio
30:1 Ratio
40:1 Ratio
60:1 Ratio
80:1 Ratio
120:1 Ratio
5:1 Ratio
5:1 Ratio
PART
NUMBER
PSD-0092400-DN
PSD-0092500-DN
PSD-0092600-DN
PSD-0092700-DN
PSD-0092800-DN
PSD-0092900-DN
PSD-0093000-DN
PSD-0093100-DN
PSD-0093500-DN
PSD-0093600-DN
PSD-0093700-DN
PSD-0093800-DN
PSD-0093900-DN
PSD-0094000-DN
PSD-0094100-DN
PSD-0094200-DN
PS-0003300-A
PS-0000800-A
PS-0003200-A
1950-1-B-A-DO
1950-4-B-A-DO
1950-1408
PSD-0024700-B
PSD-00904-00-A
PM-001 8000-A
PSD-0024500-A
PC-0069200-A
PS-0001 000-A
M-0073000-A
04-56401 9-DN
Special Gemco Rotary Limit Switches
Special NEMA 4 Four Circuit Rotary Limit Switch with
To Meet Your Specific Applications
Two Circuit Rotary Limit Switch with a Special Mounting
Bracket and Integral Right Angle Worm Gear for Mounting in
a Power Jack.
Special Two Circuit Open Type Rotary Limit Switch with a
Single Turn Potentiometer.
a Potentiometer for mounting on a rotary valve.
Special Three Circuit Rotary Limit Switch used on a
Mobile Man Lift.
WORM GEAR TYPE
Ratios from 5:1 to 5333.3:1
2 CIRCUIT
WORM GEAR TYPE
Ratios from 5:1 to 1080:1
SPUR GEAR TYPE
Ratios from .5:1 to 3:1
HEAVY DUTY TYPE
Ratios from 5:1 to 3000:1
4 CIRCUIT
WORM GEAR TYPE
Ratios from 5:1 to 1080:1
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