NO NEED FOR EXPENSIVE PC BOARDS AND HARDWARE
The LMD/LMS Connector Series was designed by Amphenol Pyle-National to provide flexibility in the assembly of wire harnesses that are used in instrumentation and avionic control environments. The modular design of the LMD provides rack and panel or cable to cable attachment. LMS allows an in-line splice using the same modules.
AMPHENOL LMD-LMS MODULAR CONNECTORS - FEATURES
Design Features of LMD Connectors
LMD Features and Options
- An LMD Connector is comprised of a housing, modules and contacts - each ordered separately, requiring assembly
- Lightweight housings are offered black thermoplastic
- Four standard modules are available with the following contact arrangements: 1 #8, 4 #16, 9 #20,16 #22
- Modules are available in sealed and unsealed versions
- Linear module design may be used for rack and panel or cable to cable applications
- Bussing modules available to allow for a plurality of circuit network configurations without extra hardware
- Diode modules provide a current protection system for avionic instrumentation packages and eliminate the need for dedicated PC boards and other hardware
- Miniature relay modules can be added which eliminate the need for printed circuit boards and hardware
LMD’s module options provide a mix of both active and passive devices within one connector. The features and options of this series describe the design flexibility in this connector series:
- LMD Standard components are molded of a U/L rated 94VO flame retardant, light-weight thermoplastic material. Alternate white nylon material (provides resistance to industrial oils and solvents) is available; consult Amphenol Aerospace for availability.
- The linear LMD connector may be used for rack and panel or cable-to-cable applications.
- Plug and receptacle housings may be front or rear panel mounted.
- Optional keying post provides six position keying capability.
- The optional center jackscrew provides ease of mating and unmating and insures high reliability under vibration.
- Cable strain reliefs are available for internal attachment.
- Variety of module types. Sealed and unsealed modules accept rear release #8, #16, #20 and #22 gauge contacts. Bussing, diode and relay modules available. PC tail contacts are also available.
- A variety of contacts accept #8 through #28 AWG wire. Commercially available automated crimp terminating equipment may be used.
- Wired or unwired modules are rear inserted and held by two retention tines. With the aid of a front release tool, the modules are easily removed from the rear.
- Pin or socket modules may be intermixed in plug or receptacle housings.
AMPHENOL LMD-LMS MODULAR CONNECTORS - MATERIALS & FINISHES
50 microinches Gold Plate
AMPHENOL LMD-LMS MODULAR CONNECTORS - ELECTRICAL DATA
Dielectric Withstanding Voltage AC (RMS)
Max. Recommended Working Voltage AC (RMS)
Contact Crimp Tensile Strength Lbs. Min.
* with #12 wire well
AMPHENOL LMD-LMS MODULAR CONNECTORS - MECHANICAL
–55° C to +140° C (-67 ° F to + 284° F)
Insulation Resistance (min.)
5000 megohms initial: 1000 megohms after 96 hours humidity
250 cycles (mating and unmating)
Maximum discontinuity of one microsecond when subjected to sinusoidal vibration of 10 to 2000 Hz at 15 gravity units
Maximum discontinuity of one microsecond when subjected to 1/2 -sine-wave transient shock of 50 gravity units with pulse duration of 11 milliseconds
Module Insertion & Removal Force
5 lbs. maximum
70 lbs. minimum
AMPHENOL LMD-LMS MODULAR CONNECTORS - APPLICATIONS
- Airline Seats/Power Distribution
- Interior Lighting / LED
- Aircraft Galley
- In-flight Entertainment
- Heavy Equipment
- Business Jets
STEP 2: SELECT COUPLING MECHANISM
J - Jack Socket (Rotating)
K - Jack Screw (Fixed)
E - No Coupling Mechanism
STEP 3: SELECT ALTERNATE KEYING
No Key Hardware Supplied
EXAMPLE OF MATING HOUSINGS: LMD-06PJ4 mates to LMD-06RK4
AMPHENOL LMD-LMS MODULAR CONNECTORS - MODULES FOR CRIMP CONTACTS
Sealed size 8 module N/A
AMPHENOL LMD-LMS MODULE CONNECTORS - MODULES FOR BUSSING
Bussing Circuit For Size 22 Contacts
Bussing Circuit For Size 20 Contacts
Bussing Circuit For Size 16 Contacts
AMPHENOL LMD-LMS MODULE CONNECTORS - MODULES WITH DIODES
Diode Modules For Size 22 Contacts
Diode Modules For Size 20 Contacts
4 pairs of diodes, each pair with a common cathode
8 diodes with common cathode (pin #1)
3 pairs of diodes, each pair with common cathode
8 diodes with common cathode (pin #5)
AMPHENOL LMD-LMS MODULE CONNECTORS - MODULES WITH RELAYS
Relay Modules For Size 22 Contacts
AMPHENOL LMD-LMS MODULAR CONNECTORS - CONTACTS
= Thermocouple Plating
P = Chromel
R = Alumel
N = Constantan
C = Copper
AMPHENOL LMD-LMS MODULAR CONNECTORS - CONTACT TOOLS
Module Extraction Tool:
AMPHENOL LMD-LMS MODULAR CONNECTORS - DIMENSIONS FOR LMD HOUSINGS
Receptacle Housing 6 Bay
Plug Housing 6 Bay
AMPHENOL LMD-LMS MODULAR CONNECTORS - DIMENSIONS FOR LMD-LMS MODULES
Modules with 16 Size 22 Contacts
Modules with 9 Size 20 Contacts
Modules with 4 Size 16 Contacts
Modules with 1 Size 8 Contact
AMPHENOL LMD-LMS MODULAR CONNECTORS - DIMENSIONS FOR LMD-LMS BUSSING MODULES
Modules with Size 22 Contacts
Modules with Size 20 Contacts
Modules with Size 16 Contacts
Module Side View
Standard Bussing Module
Sealed Bussing Module
Bussing Configuration (Rear View)
LMD Bussing Module Part Number
AMPHENOL LMD-LMS MODULAR CONNECTORS - DIMENSIONS FOR LMD-LMS DIODE MODULES
Diode Modules with Size 22 Contacts
Diode Configuration (Rear View)
Diode Modules with Size 20 Contacts
Diode Configuration (Rear View)
LMD Diode Module Part Number
4 pairs of diodes, each pair with common cathode
8 diodes with common cathode (pin #1)
3 pair of diodes, each pair with common cathode
8 diodes with common cathode (pin #5)
AMPHENOL LMD-LMS MODULAR CONNECTORS - DIMENSIONS FOR LMD-LMS RELAY MODULES
Relay Modules with Size 20 Contacts
LMD Relay Module Part Number
Relay Configuration (Rear View)
AMPHENOL LMD-LMS MODULAR CONNECTORS - DIMENSIONS FOR ACCESSORIES
Strain Relief 2 Piece
LMS In-Splice Housing
LMS Panel Mounting Bracket
AMPHENOL LMD-LMS MODULAR CONNECTORS - DIMENSIONS FOR LMD-LMS PIN CONTACTS
Pin Contact Size 22 - LMD-4022-36LJ
Pin Contact Size 20 - LMD-4020-96LD & LMD-4020-10 Types
Pin Contact Size 16 - LMD-4016-96LD & LMD-4016-10 Types
Pin Contact Size 8 - LMD-4008-36L
AMPHENOL LMD-LMS MODULAR CONNECTORS - DIMENSIONS FOR LMD-LMS SOCKET CONTACTS
Socket Contact Size 22 - LMD-4122-96LD
Socket Contact Size 20 - LMD-4120-96LD & LMD-4120-10 Types
Socket Contact Size 16 - LMD-4116-96LD & LMD-4116-10 Types
Socket Contact Size 8 - LMD-4108-36L
AMPHENOL LMD-LMS MODULAR CONNECTORS - CRIMPING, INSERTION, & REMOVAL OF CONTACTS
Amphenol recommends the tools listed on the Contacts & Tooling Section for use with LMD connectors, and also the following procedures for wire preparation, crimping of wire and contact insertion and removal.Wire Preparation
Strip wires to dimension “A” shown in table. Avoid cutting or nicking wire strands.
Crimping Wire to Contacts
Wire O.D. Max.
Stripping Length Dimension "A"
STEP 1: Fully insert wire into contact crimp pocket. Wire must be visible through wire inspection hole.
STEP 2: Insert contact into tool (use proper crimping tool as listed in Contacts & Tooling). Crimp contact to wire. Tool will not open if contact is not fully crimped.
STEP 3: After crimping, wire should be visible through wire inspection hole.
STEP 1: Using proper insertion/removal tool as listed on previous page, slip wire into insertion end (colored end), placing crimp end of contact inside the slotted portion and contact shoulder against end of tool.
STEP 2: Align contact with the cavity at the rear face of the module. Carefully push the contact into the full depth of the cavity. Withdraw tool. A slight axial pull on the wire will confirm contact is locked in proper position.
Snap the extraction end (white end) of the tool over the wire of the contact selected for removal. Carefully push the tool into the full depth of the contact cavity releasing the contact retaining collet. Hold the wire against the serrations on the tool, and withdraw the tool and the wired contact from the module.
AMPHENOL LMD-LMS MODULE CONNECTOR - MODULE INSERTION/REMOVAL & USE OF STRAIN RELIEF
Pin or socket modules, wired or unwired, can be inserted or intermixed in plug or receptacle housings. Select from standard module configurations shown on pages 103 & 104, or select the optional bussing, diode or relay modules offered, shown on pages 105 & 106. The next instructions illustrate the proper method of insertion and removal of modules within the LMD connector.
Align the module with the proper cavity at the rear of the housing. The module keyway must be positioned to accept key in housing cavity. Carefully insert the module straight in to the cavity until fully seated and locked in place. A slight axial push on the front of the module or a pull on the cable bundle will confirm module is locked in proper position.
Assembly of Internal Strain Relief
STEP 1: Select module to be removed and place the blades of removal tool into the removal slots at the front of the connector. Push the removal tool into the full depth of the cavity, releasing the module retention tines.
STEP 2:With the module removal tool fully inserted, push the extraction plunger to eject the module out of the rear of the connector.
Strain reliefs, if required, may be assembled to plug or receptacle connectors which have a full complement of modules installed. The following is instruction for assembling the internal attachment strain relief, part number LMD-5300-10A (see page 107).
Tape wire bundle in area of cable clamp, and build up diameter to approx. 3/8 inches, if required. Align self-locking tines of the strain relief housing with the cavities adjacent to each module. Push the strain relief housing into place until the self-locking tines snap and lock strain relief into position. Assemble opposite half of strain relief housing to connector and tighten tie-strap to provide clamping force on the wire bundle.Opening Strain Relief to Service Modules and Contacts
Internal attachment strain reliefs may be opened to provide module and/or contact accessibility. To service connectors, first cut and discard tie-strap on strain relief. Open strain relief halves approx. 45° each by bending along integral flexible hinge. After servicing, close strain relief halves and install and tighten new tie-strap.
To completely remove strain relief from the housing in order to provide module access; first remove tie-strap, open strain relief halves 45° each, then remove module, then remove strain relief.