Long-life Two-circuit Limit Switch
WLM
@
F-103
Lim
it
Switch
es
Engineering Data
■
Electrical Durability: cos
φ
= 1
■
Lamp-equipped Models
The operating status of the Switch can be checked using a neon
lamp of LED indictor.
Circuit checks and troubleshooting errors are easy done.
The built-in switch’s terminal screws are used to connect the lamp
terminal (indicator cover). Since the connection spring (coil spring) is
used for this connection, it will not be necessary to connect to the
lamp terminal. When a ground terminal is provided however, lead
wire method must be used.
WL-LD has a built-in rectifier stack, so it will not be necessary to
change the polarity.
The indicator cover is molded from diecast aluminum and has out-
standing sealing properties. Furthermore, regardless of whether the
power is connected or not, the operating status is shown (operating
or not operating), and indicators can be switched from light-ON when
operating and light-ON when not operating, by simply rotating the
lamp holder by 180
°
.
The lamp-equipped models are ideal in locations using a conveyor
belt where items need to be checked, or locations that are difficult to
inspect for faults.
Indicator Lamp and Load Operation
When the indicator lamp is set to light-ON when operating, connect
the load on the NC side, and set so that the load turns ON when the
actuator is free.
When the indicator lamp is set to light-ON when not operating, con-
nect the load on the NO side, and set so that the load turns ON when
the actuator is pushed down.
Light-ON when Operating
When the Switch’s contacts and the internal circuit of the lamp holder
are connected in parallel, there is large resistance from the internal
circuit, so the current will flow through the Switch’s contacts and the
load will turn ON.
When the contacts and the internal circuit are separated, only a
small voltage, enough to light the indicator lamp will flow to the lamp,
but the load will not turn ON.
Operation
Note: 1.
Light-ON when operating means that the lamp lights when
the Limit Switch contacts (NC) release, or when the actuator
rotates or is pushed down.
2.
Light-ON when not operating means the lamp remains lit
when the actuator is free, or when the Limit Switch contacts
(NO) close when the actuator rotates or is pushed down.
Operating temperature: 5
°
C to 30
°
C
Operating humidity: 40% to 70%
Switching current (mA)
Dur
ability (x 10
4
oper
ations)
125 VAC
250 VAC
480 VAC
Operating frequency: 30 operations/min
cos
φ
= 1
Operation
indicator
window
Light emitting diode (LED)
Lamp holder
Contact spring
LIght-ON
when
operating
(See note 1.)
Light-ON
when not
operating
(See note 2.)
Light-ON when Operating
Light-ON when Not Operating
LED at bottom
LED at top
WL-LD
Power supply
Built-in switch
Load
Internal circuit
WL-LD
Power supply
Built-in switch
Load
Internal circuit
