S Series

Stationary Cylinder for Precise Alignment

The actuating cylinder and piston in the S series design do not rotate. They are bearing sup-ported on the mounting hub and are held stationary by the external connection to the inlet port. This bearing allows the separator discs and hub, and the shaft on which it mounts, to rotate about the cylinder and pis-ton. A thrust bearing permits relative motion between the stationary piston and rotating separator discs. Because both bearings require lubrication, it is important to utilize lube ports provided and/or direct an oil spray or splash at bearing surfaces.

Features

Hydraulic or Pneumatic Actuation
Wet Operation
Stationary Cylinder and Piston
Fast Response / Lower Inertia
Easy Installation
Minimal Actuating Flow
Positive Disengagement
Can be Modified to Meet Specific Application Requirements

S Series Clutch Diagram

Hydraulic / Pneumatic Clutch for Wet Operation

S Series Dimensions

S Series Dimensions
Model	Units	E	G	F	J	N	R	S	V	W
250	in mm	2.50 64	2.91 74	6	.610 15.5	2.81 70	1.215 30.9	1.000 25.4	0.22 5.6	0.125 3.2
300	in mm	3.00 76	3.31 84	6	.734 18.7	3.31 84	1.270 32.3	1.000 25.4	0.22 5.6	0.156 4.0
350	in mm	3.50 89	3.81 97	6	.734 18.7	3.88 98	1.328 33.7	1.000 25.4	0.22 5.5	0.188 4.8
400	in mm	4.00 102	4.38 111	6	.734 18.7	4.38 111	1.58 40	1.000 25.4	0.25 6	0.188 4.8
450	in mm	4.50 114	4.88 124	6	.797 20.2	4.88 124	1.656 42.1	1.000 25.4	0.28 7	0.219 5.6
550	in mm	5.50 140	6.00 152	12	.609 15.5	6.00 152	1.859 47.2	2.000 50.8	0.31 8	0.188 4.8
600	in mm	6.00 152	6.56 167	12	.609 15.5	6.56 167	2.000 50.8	2.000 50.8	0.38 10	0.188 4.8
700	in mm	7.00 178	7.63 194	12	.734 18.7	7.69 195	2.172 55.2	2.000 50.8	0.38 10	0.281 7.1
800	in mm	8.00 203	8.63 219	12	.734 18.7	8.69 221	2.406 61.1	2.500 63.5	0.38 10	0.344 8.7
900	in mm	9.00 229	9.75 248	12	1.250 31.8	9.87 251	2.969 75.4	2.500 63.5	0.44 11.2	0.500 12.7

Model	Units	A max.1	A max.2	D	H3	K	L max.	X min.	Y	AA
250	in mm	0.625 16	0.563 14	2.254 57.3	1/16-27	0.26 7	2.604 66.1	0.188 4.8	0.047 1.2	0.03 0 72
300	in mm	1.031 26	0.969 25	2.260 57.4	1/16-27	0.23 6	2.641 67.1	0.188 4.8	0.047 1.2	0.02 0.5
350	in mm	1.188 30	1.125 29	2.380 60.5	1/8-27	0.29 7	2.792 70.9	0.246 6.2	0.058 1.5	0.03 0.7
400	in mm	1.718 44	1.594 40	2.625 66.7	1/8-27	0.29 7	3.063 77.8	0.249 63	0.080 2.0	0.03 0.7
450	in mm	1.813 46	1.750 44	2.875 73.0	1/8-27	0.34 9	3.380 85.9	0.262 6.7	0.087 2.2	0.04 1.0
550	in mm	2.313 59	2.188 56	3.255 82.7	1/4-18	0.37 9	3.761 95.5	0.337 8.6	0.083 2.1	0.04 1.0
600	in mm	2.625 67	2.500 64	3.440 87.4	1/4-18	0.36 9	4.008 101.8	0.344 8.7	0.099 2.5	0.02 0.4
700	in mm	3.125 79	2.938 75	3.780 96.0	1/4-18	0.41 10	4.441 112.6	0.414 10.5	0.108 2.7	0.04 1.0
800	in mm	3.375 86	3.250 83	4.222 107.2	1/4-18	0.49 12	4.946 125.6	0.355 9.0	0.155 3.9	0.05 1.1
900	in mm	3.937 100	3.750 95	4.800 121.	3/8-18	0.54 14	5.743 145.9	0.388 8.7	0.130 3.3	0.04 0.9

Notes:

Unless otherwise noted, upper value units are inches; lower value units are millimeters.

Customer to specify dimensions A, B and C. Hub bore dimension A not to exceed maximum allowable bore.

Maximum allowable hub bore with standard rectangular key.
Maximum allowable hub bore with standard square key.
American National Pipe Thread.

Operating Parameters

S Series
Model	(lb)	(lb-ft2)	Max. Speed	Cylinder Volume3		Actuating Flow4
Model	(kg)	(kgm2)	(RPM)5	new disc	worn disc	GPM (LPM)
250	2 0.9	0.004 0.0002	5000	0.35 5.7	0.59 9.7	0.9 3.5
300	3 1.4	0.009 0.0004	4300	0.44 7.2	0.74 12	1.2 4.6
350	5.4 2.4	0.02 0.001	3200	0.7 11	1.0 16	1.7 6.4
400	7 3.2	0.04 0.002	2700	0.72 12	1.2 20	1.9 7.2
450	10.7 4.9	0.09 0.004	2400	1.0 16	2.5 41	2.6 10
550	18.4 8.3	0.22 0.01	2000	1.5 25	3.8 62	4.0 15
600	24 10.9	0.35 0.01	1900	2.0 33	6.0 98	5.2 20
700	35 15.9	0.67 0.03	1600	3.3 54	7.5 123	8.6 33
800	51 23.1	1.24 0.05	1400	4.2 69	10.0 164	11.0 42
900	68 30.8	2.36 0.10	1300	6.0 98	11.0 180	16.0 61

Logan Outperforms
Electromagnetic Clutches!
Logan has the design and manufacturing capability to replace existing and obsolete electromagnetic clutches with Logan technology.
Logan vs. Electromagnetic Clutches

Transmits more Torque and has higher RPM
capabilities within the same envelope
Eliminates residual DC magnetism in disc packs
and bearings-reduces downtime
Disc Pack, Bearing Kits and Seal Kits for Logan
clutches are available from stock

View of a modified standard Logan S 300 Series clutch (right) which replaced an Ortlinghaus style electromagnetic clutch (left). The clutch, drive cup and disc pack were modified on the Logan S300 to fit within the existing Electromagnetic clutch envelope.

Side view showing identical axial length, and 3-disc pack Configuration of the Logan S300 and Ortlinghaus style clutch.

Operating Parameter Notes:

Logan Seals / O-Rings are provided in a fluorocarbon elastomer having a 70 durometer. Operating temperature range is -15 to 400 degrees F (-26 to 204 degrees C).

Clutch weight: Based upon minimum hub bore. Does not include drive cup and friction discs.
Cylinder Volume: Upper value units are cubic inches; lower value units are cubic centimeters.
Actuating Flow: Based upon an actuating time of 0.1 second. Upper value units are gallons per minute; lower value units are liters per minute.
RPM: For higher operating speeds, contact Logan.

Static Torque Ratings

Static Torque Ratings

Selection Procedure

S Series Wet Operation
Model	PSI (Ratings in ft. lbs.)*						Bar (Ratings in Nm)
Model	50	75	100	125	150	175	3.4	5.2	6.9	8.6	10.3	12.1
250	22	39	57	74	91	109	30	53	77	100	123	148
300	32	57	82	106	131	156	43	77	111	144	178	212
350	52	81	130	169	208	247	71	110	176	229	282	967
400	63	117	171	225	279	333	85	159	232	305	378	452
450	102	178	253	329	404	480	138	241	343	446	548	651
550	192	325	459	592	725	858	260	441	622	803	983	1163
600	281	465	648	832	1015	1198	381	631	879	1128	1376	1624
700	427	700	973	1246	1519	1792	579	949	1319	1690	2060	2430
800	511	849	1187	1525	1863	2201	693	1151	1610	2068	2526	2985
900	854	1422	1990	2559	3127	3695	1158	1928	2698	3470	4240	5010

*S series torque values based on wet operating conditions.
Maximum recommended operating pressure 150 PSI (10.3) BAR

A fixed orifice pressure valve should be specified in the system to prevent over-pressurization of any Logan Clutch. The Logan warranty does not cover clutch failure due to over-pressurization. The highest pressure values in the torque tables are maximum ratings for Logan Clutches.
Example: Select a wet environment clutch
HP = 150 Clutch Speed = 800 RPM Service Factor= 1.3 Available operating pressure = 150 psi.	T = 984 . 1.3 = 1280 lb. ft. Choose model 800 in the R or S series.

Suggested Service Factor Table
Duty	SF
Small inertia Low Cycle Rate Non-pulsating Load	1.3 to 1.7
Large inertia Low Cycle Rate Non-pulsating Load	1.7 to 2.2
Large inertia High Cycle Rate Pulsating Load	2.2 to 3.2

I. Calculate the torque requirement for the application using one of the following formula:
formula

II. Identify which service factor best identifies your application from the suggested service factor table located at the bottom of this page.

III. Adjust the torque requirement using the selected service factor.
T= Tc . SF or T=Tb . SF

IV. Decide which series best fits your drive

V. Using the appropriate series torque pressure graph, determine the model size.

Vl. Determine if the Series and models can:
1) Accommodate the shaft and key
2) Operate at the required speed
3) Fit within the available space

Vll. Determine the Drive Cup Mounting

Vlll. Call or fax Logan Clutch Corporation to review your selection and place your order. Application fact sheets are available online or from Logan Clutch.
HP = Horsepower
RPM = Clutch or Brake shaft speed
SF = Service Factor
T= Required Torque (Ib ft.)
Tb = Brake Torque (Ib. ft.)
Tc = Clutch Torque (Ib. ft.)
t = Time to stop (seconds)
WK2 = Total inertia to be stopped
(Ib.ft.2)