7
NL
<Antenna in Parallel>
If more than one NL is used in parallel or side-by-side, make sure that
the distance between the antennas is at least 4 cm.
<Maintenance>
Make sure that the antenna is free of oil, dust, or rust, otherwise
the antenna may not operate.
Application in Locations Subject to Water or Oil.
Do not use the NL in places where water or oil (especially water-
soluble oil) is frequently sprayed to the NL or antenna, otherwise the
NL may malfunction.
Grounding
•
In order to maintain the operational reliability of the NL, be sure to
ground the blue (black) wire of the power cable.
•
The blue (black) lead wire of the connection cable will be connected
to the casing internally if the model is the NL1 or NL2. The NL1 or
NL2 does not operate with the service power supply of the PC
(Programmable Controller) because the negative end of the service
power supply is not grounded. The noise immunity performance of
the PC will be degraded if the negative end of the service power
supply is grounded.
•
Provided that single-phase 200 V is supplied to the NL3, if one
phase is grounded, the power supply will be short-circuited and a
machinery breakdown will result. Use an isolating transformer and
ground the secondary side of the transformer instead.
•
To maintain operating reliability and durability, connect the blue
(black) line in the connecting cable to ground.
•
In the above case, be sure to ground the secondary side, otherwise
the NL may not operate.
Note: The lead wire colors of the NL have been changed in compliance with the
latest applicable JIS standards. Colors in parentheses are previous ones.
Others
•
Do not disassemble the NL, otherwise the internal wiring will be
damaged and the NL will fail to operate.
•
Make sure that the conduit opening is free of foreign materials or
cuttings.
•
The sealing of the NL uses nitrile butadiene rubber (NBR), which is
highly oil resistive. If exposed to some types of oil or chemical
indoors or outdoors, however, the NBR may deteriorate. Contact
your OMRON representative for details.
•
Make sure that the load is connected according to the connection
diagram. The internal circuit of the NL will break due to mistakes in
wiring or load short-circuiting.
Note: The lead wire colors of the NL have been changed in compliance with the
latest applicable JIS standards. Colors in parentheses are previous ones.
•
Remove the warning label on the end of the connection cable
before wiring.
•
Load Switching
The NL3 switches AC loads. The maximum switching load varies
with the ambient temperature as shown in the following graph of
load characteristic curves.
Note: 1. Load (1) is an inductive load with a maximum repetitive operation rate
of once per 5-minute period or resistive load.
2. Load (2) is an inductive load with a maximum repetitive operation rate
of 3 times per minute.
3. Load (3) is an inductive load with a maximum repetitive operation rate
of 30 times per minute.
4. Load (4) is an inductive load with a maximum repetitive operation rate
of 300 times per minute.
5. Except for the resistive load, the characteristic curves cover repetitive
operations in an ON-to-OFF ratio of 1:1. If the OFF period is extremely
short in actual application, use 80% of the above values.
NL
NL
4 cm min.
NL
NL
4 cm min.
NL3
AC
Brown
(Red)
Black
(White)
Blue
(Black)
Load
Brown (Red)
Incorrect
Black (White)(Output)
Blue (Black)
Power
supply
Load
Brown (Red)
Incorrect
Black (White)(Output)
Blue (Black)
Power
supply
Brown (Red)
Correct
Blue (Black)
Power
supply
Load
Black (White)
(Output)
(3)
(4)
0
(1)
NL3 Load Characteristic Curves
(2)
0.3
0.2
0.1
−
15
20
40
Temperature (
°
C)
Switching current (A)
60
