Rockwell Automation 871TM User Manual

BULLETIN

871TM

SPECIFICATIONS

Load Current ≤ 400 mA (maximum), 5 mA (minimum). . . . . . . . . . . .

Inrush Current ≤ 4 A. . . . . . . . . . .

Leakage Current ≤ 1.7 mA at 120VAC. . . . . . . . .

Operating Voltage 40–250 V AC/DC. . . . . . . .

Voltage Drop ≤ 5 V at 400 mA, 10 V at 10 mA. . . . . . . . . . . .

Repeatability ≤ 1% at constant temperature. . . . . . . . . . . .

Hysteresis 10% typical. . . . . . . . . . . . . . .

Short Circuit Protection Incorporated (trigger at 8A typical). . .

Overload Protection Incorporated (trigger at 550 mA typical). . . . . .

False Pulse Protection Incorporated. . . .

Transient Noise Protection Incorporated

UL Listed or Recognized. . . . . . . . . . . . . . . . . . . . .

Enclosure Stainless steel face and barrel. . . . . . . . . . . . . . .

Cable 3 conductor. . . . . . . . . . . . . . . . . . .

Quick Disconnect 3 pin, Micro and Mini types. . . . . . . .

LEDs Red: T arget Green: Power, Flashing: SCP. . . . . . . . . . . . . . . . . . .

Temperature: Operating: –25

Shock and Vibration 5G, 30–120 Hz. . . . . .

(–13

F to 158o F)

3 mutally perpendicular & 1 worst plane

INDUCTIVE PROXIMITY SENSOR

133–547(B)

WIRING DIAGRAMS

Cable

Mini Quick Disconnect

C to + 70o C. . . . . . . . . . . .

Micro Quick Disconnect

WHT

BLK

LOAD

GRN

GROUND

LOAD

GROUND

INSTALLATION INSTRUCTIONS

CAUTION; Solid state devices can be susceptible to radio frequency (RF) interference, depending on the frequency of the transmitting source. If RF transmitting equipment is to be used in the vicinity of the solid state devices, thorough testing should be performed to assure that the transmitter operation is restricted to a safe operating distance from the control equipment and wiring.

WARNING: Do not let MET AL objects that are not to be sensed come within three times the sensing distance of this device. Unintended process activation may result in a hazardous condition.

EFFECTS OF NEARBY METAL SURFACES

Metals immediately opposite the sensing face should be no closer than three times the rated operating distance of the sensor.

Not shielded

≥3d

Metal free

Shielded

3 Sn

Sensors not embedded in metal

ddd

Sensors embedded in metal

Sn = rated operating distance d = diameter of sensing surface

SPACING BETWEEN SENSORS

When installing side by side, the minimum spacing distance should be maintained. When mounting face to face, use two times the diameter.

ddd

Shielded

Sensors embedded in metal

d = diameter of sensing surface

Sensors not embedded in metal

2d d

Not shielded

IMPORTANT: Save these instructions for future use. For additional information and proper operating guidance, refer to the Allen-Bradley Proximity Catalog 871-1.2 or the product data sheet 871TM-2.0

SENSING DISTANCE

The standard target is a square of mild steel (ST37), 1mm thick. The side of the square is equal to the diameter of the sensor or three times the sensing distance, whichever is larger. Targets smaller than standard size may shorten the sensing distance. Targets

3 Sn

larger than standard may lengthen the sensing distance.

CORRECTION FACTORS

To determine the sensing distance for materials other than the standard mild steel, multiply the sensing distance by the factor

zone

given below:

Steel 1.0 Stainless Steel 0.9 to 1.0 Brass 0.3 to 0.5 Aluminum 0.1 to 0.4 Aluminum ≤.012 thick 0.9 to 1.1 Copper 0.4 to 0.6

SERIES CONNECTED SWITCHES

When connected in series, the operating load voltage must be less than or equal to the minimum supply voltage, minus the voltage drops across the proximity switches connected in series. The load will energize when the connected outputs of all proximity switches are energized.

PARALLEL CONNECTED SWITCHES

To determine the maximum number of switches for an application, the sum of the maximum OFF-state currents of the switches connected in parallel must be less than the maximum OFF-state current of the load device. The load will be energized when the output of any proximity switch energizes. NOTE: Parallel operation of switches does not provide higher load current capability and may generate a false pulse" under certain conditions.