IN ORDER TO AVOID ELECTRIC SHOCK OR OTHER POSSIBLE INJURY:
• DO NOT USE THIS PRODUCT FOR HUMAN SAFETY APPLICATIONS.
IT WAS NOT DESIGNED, TESTED OR RECOMMENDED FOR THIS
USE.
• DO NOT USE THIS PRODUCT IN HAZARDOUS LOCATIONS (E.G.
EXPLOSIVE ATMOSPHERES). IT WAS NOT DESIGNED, TESTED OR
RECOMMENDED FOR THIS USE.
• ENSURE THE PRODUCT IS PROPERLY WIRED TO THE CORRECT
POWER SUPLLY FOR THE APPLICATION. REFER TO THE
SPECIFICATIONS AND WIRING DIAGRAMS IN THIS MANUAL.
MODELS COVERED IN THIS MANUAL
E56BAL70UAA01
P51894 Rev 03
Effective: 18 June 2009 Page 1
Installation Instructions
E56 Pancake Style Inductive Proximity Sensor
WARNING
Questions? Call our Sensor Application Engineers at (800) 426-9184.
Note: This installation manual only covers small-diameter
pancake models (with model numbers beginning with
E56A). For the installation manual covering medium- and
large-diameter models, use P51895.
INTRODUCTION
The Cutler-Hammer E56 Pancake Style Inductive Sensor from
Eaton is a top-sensing, solid-state device used to detect metal
targets at range.
The E56 Series is available in three different sizes: small (ø 74
mm), medium (ø 96 mm), and large (ø 152 mm). Connectivity
options include a factory-installed Mini Connector, Micro
Connector or Screw Terminals. The E56 Series meets the
requirements of NEMA Type 4, 4X, 6, 6P, 12 and 13 enclosures.
Each package style is available in either 4-wire DC or 2-wire
AC/DC versions. Additional key features include complementary
outputs (1NO / 1NC) for DC models and two output status LEDs.
The 4-wire DC models also feature Auto-Confi g Outputs, which
automatically set the sensor to the correct output mode (NPN/
sinking or PNP/sourcing) without user intervention.
BASIC OPERATION
Inductive proximity sensors generate a high frequency
oscillating magnetic fi eld in the vicinity of the sensing head.
When a metal object enters this fi eld, it changes the fi eld
loading of the oscillator coil. This change is recognized by a
detector circuit, which then energizes the output.
E56 Series sensors will detect all metals, but primarily steel. The
exact distance at which a target is detected is determined by its
size, thickness and type of metal.
To determine sensing distance with your target, see the Sensing
Field Diagrams on Page 2. These diagrams serve as a reference
point and show where the target will be detected for lateral
(side or slide-by) and axial (head-on) approaches. These curves
must be corrected for smaller-than-standard targets and other
metals. (Standard target sizes are listed Page 2.)
Product Family
E56 E56 Series
Size
A Baseplate: 80 mm
Sensing Head: ø 74 mm
B Baseplate: 110 mm
Sensing Head: ø 96 mm
C Baseplate: 170 mm
Sensing Head: ø 152 mm
Voltage Type
A AC/DC 2-wire
D DC 4-wire
Output Type
L1 N.O. / 1 N.C.
M1 N.O.
N1 N.C.
Sensing Range
40 40 mm
50 50 mm
60 60 mm
70 70 mm
100 100 mm
Shielding
U Unshielded
S Shielded
Output Mode
A Auto-Confi g (NPN/PNP)
N NPN
P PNP
Connection
A01 AC Micro, 3-Pin
B01 AC Mini, 3-Pin
C02 Cable, 2 m
D01 DC Micro, 4-Pin
E01 DC Mini, 4-Pin
Screw Terminals
Note: Not all possible combinations
shown in table are offered as standard.
P51894 Rev 03
Effective: 18 June 2009Page 2 Questions? Call our Sensor Application Engineers at (800) 426-9184.
MOUNTING CONSIDERATIONS
The sensor should be mounted using four 0.25-inch bolts
through the mounting holes provided. Do not support the
sensor by conduit alone. The sensor can be mounted to
any surface without affecting sensor performance, but it is
recommended to use a solid base to ensure reliable operation.
For all unshielded inductive sensors, ensure there is adaquate
distance between the sensor face any adjacent metals. See the
below diagram for isolation distances.
When E56 Series sensors are mounted side-by-side, there
is the possibility of interaction between the magnetic fi elds
of the sensors. This could cause unreliable operation. Follow
the limitations noted in the below illustration when mounting
sensors in the same location.
Sensor Isolation Minimum Distances to Adjacent Metals
Sensor-to-Sensor Isolation Minimum Distances
SENSING
The sensing fi eld for the E56 Series sensor is shown to the
right. In addition to maximum sensing distance, this diagram
also illustrates the performance of the sensor as the target
approaches the sensing face in an axial (head-on) or lateral
(side or side-by-side) manner.
In this diagrams, the sensing distances shown are base rated
on standard target sizes. Sensing range will decrease if a target
is used that is smaller than the standard target size. See the
below table for standard target sizes for each style sensor.
Sensor Model Standard Target Size
Small Diameter
(Both Shielded and Unshielded)
3 x Sensing Range
Detection for laterally approaching targets occurs at the point
where the target fi rst touches the envelope of the sensing curve
depicted below. The curves must be corrected for smaller
targets and other metals. The general correction factors for
metals other than steel are shown below.
Maximum sensing distances are shown in the below diagrams,
but for most reliable lateral operation, keep the sensor-to-
target distance as short as possible. It is recommended that a
lateral traveling target pass at no more than 75 percent of the
maximum sensing distance.
CORRECTION FACTORS FOR METALS
Sensing range is determined by target size, thickness and metal
type. See the below table for correction factors based upon
standard target sizes.
Target Material Corrective Factor
Steel 1020 1.00
Stainless Steel 400 0.90
Stainless Steel 300 0.70
Brass 0.54
Aluminum 0.50
Copper 0.46
SENSING FIELD DIAGRAM
Small Diameter Pancake
9 x Sensing Distance 12 x Sensing Distance
3 x Sensing Distance 3 x Sensing Distance
20
(0.79)
40
(1.57)
40
(1.57)
20
(0.79)
20 (0.79)
50 (1.97)
Axial
Operate
Point
Lateral 75%
40 (1.57)
Effective: 18 June 2009
P51894 Rev 03
Page 3
Questions? Call our Sensor Application Engineers at (800) 426-9184.
TARGET POSITIONING
To ensure reliable sensing performance, it is recommended to
follow the general guidelines regarding target positioning below.
Axial (Head On) Approach — The target must be
positioned so that a projection of the target on the sensor
face covers at least half of the indicator area. If the target is
smaller than the indicator area, its axis should coincide with
the sensor axis.
Lateral (Side, Slide-By) Approach — Position the target
at a distance no greater than 75 percent of the rated axial
sensing distance from the sensor face.
SHORT CIRCUIT PROTECTION
Built-in short circuit protection prevents damage to the sensor
when the load current exceeds an unsafe level. When this
occurs with the target in the sensing zone, the load current will
be reduced to a level that will not energize the load. Depending
on the magnitude of the excessive load current, the sensor will
manage its retry rate accordingly. The output will continually
retry until the short condition is removed. For 2-wire AC/DC
models, the LED indicator will fl ash green if the short condition
persists, and the cycle will repeat until the load current returns
or is corrected to normal. For DC models, there is no LED
indication of a short condition.
AUTO-CONFIG PNP/NPN OUTPUT DETECTION
Four-wire DC versions of the E56 Series feature Auto-Confi g
outputs. This technology automatically determines how the
sensor’s output circuits have been wired and adjusts the
outputs to either PNP (sourcing) or NPN (sinking) without
any user intervention. The Auto-Confi g process takes place
at sensor power-up. If the output is changed without power
cycling the sensor, the Auto-Confi g process will not start and
therefore the outputs will not change. To ensure your outputs
are correct, always power down the sensor when making a
change to the output confi guration.
Note: If Auto-Confi g detects one output as NPN, then both
outputs will be set to NPN.
WIRING DIAGRAMS
The sensor should be mounted using four #10 bolts through the
mounting holes provided. Do not support the sensor by conduit
alone. The sensor can be mounted to any surface without
affecting sensor performance, but it is recommended to use a
solid base to ensure reliable operation.
Note: For AC/DC models, connected earth ground through
pin one or to connector shell.
DC Micro Connector DC Mini Connector
(Models Ending -D01) (Models Ending -E01)
DC Screw Terminal AC/DC Micro Connector
(Models Ending -A01)
AC/DC Screw Terminal
AC/DC Mini Connector
(Models Ending -B01)
21
3(-) 4
+V
BN
LOAD
LOAD
WH N.C.
BK N.O.
BU
Auto-Configure enables load
to be wired to +V or (-)
2
1
3(-)
4
+V
BN
BK N.O.
BU
Auto-Configure enables load
to be wired to +V or (-)
WH N.C.
LOAD
LOAD
Auto-Configure enables load
to be wired to +V or (-)
3
4
2
1
BU
BK N.O.
WH N.C.
BN
LOAD
LOAD
+V
(-)
2
1
3
L2 L1
RD/BK
LOAD
RD/WH
2
1
3L1 L2
WH
BK LOAD
3
4
2
1
BN
BU
N.O./N.C.
Selectable
L1 or +V
L2 or (-)
Not Connected
Not Connected
LOAD
P51894 Rev 03
Effective: 18 June 2009 Page 4
Questions? Call our Sensor Application Engineers at (800) 426-9184.
SPECIFICATIONS
AC/DC 2-Wire DC 4-Wire
Shielded Unshielded Shielded Unshielded
Operating Voltage 20-250V AC
20-60V DC
10-42V DC
Load Current (Max.) 400 mA 300 mA
Burden Current — < 25 mA
Off-State Leakage AC Operation:
At or Above 0°C: <1.7 mA Per Output
Below 0°C: 2.0 mA Per Output
DC Operation:
<1.5 mA
NPN Mode: < 400 µA
PNP Mode: < 1 µA
Voltage Drop < 10V (5V Nominal) < 2.5V
Frequency of Operation 30 Hz 70 Hz
Outputs N.O. or N.C. by Model Complementary (1N.O./1N.C.) with Auto-Confi g
Maximum Sensing Distance 40 mm 50 mm 40 mm 50 mm
Standard Target Size (Mild Steel) 120 x 120 mm 150 x 150 mm 120 x 120 mm 150 x 150 mm
Repeatability < 3%
Hysteresis (Max.) 15%
Time Delay Before Availability 300 msec
Circuit Protection Short Circuit Protection with Auto-Reset
Operating Temperature -40° to +70°C (-40° to + 158°F)
Temperature Drift ±10%
Enclosure Rating NEMA 4, 4X, 6, 6P, 12, 13 (IP67 and IP68)
Approvals CE
Indicator LED Green: Power
Red: Output
APPROXIMATE DIMENSIONS
Model A (Depth) B (Width) C (Depth) D (Height)
Mounting
EFG (ø)
Micro Connector
(Models Ending -A01 or -D01)
79
(3.13)
79
(3.13)
110
(4.32)
39
(1.54)
65
(2.56)
65
(2.56)
5
(0.21)
Mini Connector
(Models Ending -B01 or -E01)
79
(3.13)
79
(3.13)
119
(4.67)
39
(1.54)
65
(2.56)
65
(2.56)
5
(0.21)
Screw Terminals
(Ending in -A, -N, or -P)
79
(3.13)
79
(3.13)
92
(3.87)
39
(1.54)
65
(2.56)
65
(2.56)
5
(0.21)
A
C
E
D
G
B
F
