Page 66 - Sensors and Systems - North American Catalog
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Refer to General Notes Relating to Product Information
Pepperl+Fuchs Group
USA: +1 330 486 0001
Singapore: +65 6779 9091
Copyright Pepperl+Fuchs
Sensors and Systems
WARNING – SAFETY APPLICATIONS
All safety applications must be in accordance with
NEMA Standards Publication No. ICS 1.1-1984
(R1988, R1993, R1998, R2003, R2009) or other
applicable standards and must be approved by a
qualified safety engineer.When using sensors as nonincendive
for Class I, Division 2, Groups A, B, C and D or Class II, Division
1, Groups E, F and G hazardous locations, installation should
be in accordance with Pepperl+Fuchs’ instructions and the
National Electrical Code. See the Certifications and Testing
Standards section in the catalog Appendix.
Sensor Connections/Sensor Outputs
Pepperl+Fuchs provides sensors that can be operated with
AC and/or DC supply voltages.
The following list provides an overview.
Two-wire DC sensors
These are operated in serieswith the loador connecteddevice.
Most are voltage polarity independent (function independent of
connection polarity) and are predominantly short-circuit proof,
while others offer reverse polarity protection (function only
with correct polarity, otherwise the proximity sensor remains at
high impedance) and are short-circuit proof.While in the OFF
state, a low level of current will flow into the sensor to power the
electronics.While in the ON state, conduction current will flow
and a minor voltage drop appears across the switch.
Switching example:
BN
L+
L-
BU
The model number for sensors of this type includes the
reference -Z. Two-wire sensors are supplied as:
•
NO contact (Z/Z0, Z3, Z4)
•
NC contact (Z1, Z5)
•
Configurable by wiring (Z2)
Three-wire DC sensors
These sensors have separate connections for the power supply
and the load. They are overload protected, short-circuit proof,
and reverse polarity protected.The leakage current is negligible.
This group is divided into switched high (PNP) sensors and
switched low (NPN) sensors. Depending on the type of sensor,
the load is connected between output and 0 V or between the
output and +U B .
NPN PNP
Switching example:
BN
L+
L-
BK
BU
The model number for the vast majority of this type of sensor
includes the reference -E.
Sensors of this type are supplied as:
•
NPN NO contact (E or E0)
•
NPN NC contact (E1)
•
PNP NO contact (E2)
•
PNP NC contact (E3)
•
NPN NO/NC contact convertible (E4)
•
PNP NO/NC contact convertible (E5)
•
PNP NO contact, dual channel (E8)
DC sensors, push-pull
These proximity switches are equivalent to the E-types, but are
equipped with both a PNP and an NPN transistor.This enables
the load to be switched between the output cable and +UB or
-UB. A push-pull output combines the properties of a PNP and
an NPN output.
Switching example:
Standard symbol/Connections:
(version EP, pnp/npn)
Beam input
Synchronous
Switch output
Core colours in accordance with EN 60947-5-2.
+ U
B
1
- U
B
2
4
3
5
(BN)
(WH)
(GY)
(BK)
(BU)
U
Sensors with push-pull output are included in:
•
Photoelectric sensors
•
Ultrasonic sensors
•
Incremental rotary encoders
Four-wire DC sensors
These proximity switches are equivalent to E-types, but are
equipped with an NC contact output and an NO contact
output.
Switching example:
:
1
L+
L-
4
2
3
The model number for this type of sensor includes the
reference -A. They are supplied as:
•
NC/NO contacts, current sinking NPN (A or A0)
•
NC/NO contacts, current sourcing PNP (A2)
load
load
Last
L+
L-
Last
L+
L-
