XCMD2116L1 SQUARE D, XCMD2116L1 Datasheet - Page 207

LIMIT SWITCH, 1NO.1NC, 240VAC, 250VDC, 6A

XCMD2116L1

Manufacturer Part Number
XCMD2116L1
Description
LIMIT SWITCH, 1NO.1NC, 240VAC, 250VDC, 6A
Manufacturer
SQUARE D
Datasheet

Specifications of XCMD2116L1

Actuator Style
Roller Lever
Operating Force Max
0.1N
Switch Operation
(ON)
Contact Voltage Ac Max
240V
Contact Voltage Dc Max
250V
Contact Current Ac Max
6A
Contact Current Dc Max
6A
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Limit Switches
9007C Heavy Duty Industrial
Technical Information
Figure 3—Limit switch
Figure 4—Cam track dimension
Figure 5—Contact travel
03/2007
Reverse
travel
over
(dog)
Cam
Position
switch
Lever inverted
L1
Initial position
Reset over travel
Contacts
reset
Cam track
Pre travel
Coil
Differential
level type
Actuator
Contacts trip
shown
Coil
L2
travel
Over
Glossary
Definition of limit switch terms
There are many terms common to position switches that are not used with other control devices.
Before proceeding further, definitions of the commonly used terms should be understood as these
terms will be used throughout this document.
Limit switch—A device that converts a mechanical motion into an electrical control signal.
Actuator—The mechanism of a limit switch that operates the contacts, i.e., lever arm, plunger,
wobble stick.
Cam—A machine part or component that applies force to the switch actuator causing it to move as
intended. Also known as “dog”.
Cam track dimension—The distance from the switch mounting surface to some point on the roller
or actuator.
Differential—The distance that the limit switch actuator moves, from the trip point to the reset point
of the contacts.
Direct-acting/positive opening contacts—Normally closed contacts that are moved directly by
the operating shaft. They are slow make-slow break contacts and have a shorter life than snap
action contacts due to longer arcing times. In general, these should only be used where movement
of actuator must break welded contacts, as in a crane safety limit switch. (Snap action positive
opening contacts are available in the Telemecanique
Maintained contacts—Contacts that remain in the tripped position until the return travel of the cam
moves the switch actuator back and resets the contacts.
Neutral (free or normal) position limit switch—A lever arm type switch with two sets of contacts.
One set operates when the shaft is rotated clockwise; the other operates when the shaft is rotated
counterclockwise.
Operating force—The force required to move limit switch actuator to cause the contacts to change
state.
Overtravel—The distance that the position switch actuator may move beyond the trip point, (see
figure 5) without damage to the switch.
Pole—The number of moveable contacts in a switching mechanism. A single pole device may be 1
N.O., 1 N.C. or 1 N.O. and 1 N.C. with a single set of moveable contacts is used to bridge those
stationary contacts. A double or two pole switch has two moveable contacts.
Positive break contacts—Normally closed contacts with a special mechanism to ensure opening.
Can be snap acting positive break or direct acting slow make, slow break type. The slow break
direct acting type is not recommended for high cycle applications due to shorter life.
Pre-travel—The distance that the limit switch actuator must move to trip the contacts.
Reed contacts—A mechanism consists of a set of contacts hermetically sealed in a glass envelope
and actuated by a magnet attached to the operator. This sealed construction keeps contaminants
out of the contact area, making the reed switch ideal for low voltage, low current circuits such as
programmable controllers.
Reset point—The position of the actuator at which the contacts return to the normal position.
Snap action contacts—Contacts that move rapidly to open or closed position and are relatively
independent of cam speed. Because of shorter arcing times, snap acting contacts have longer
contact life than slow make and break contacts and should be used where fast moving cams are
encountered or where good repeat accuracy is required.
Spring return—Contacts that return to their original position when the actuating force is removed.
(continued)
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®
XCKJ limit switch.)
207

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