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Excessive line capacitance can be caused by cable lengths over 50' when using a
maximum 48 VAC. A resistor can be added in series to limit the inrush current
(at least 48 ohms for 24 Volt applications).
The resistor can be added in series just before the load.
The voltage drop and the power rating of the resistor must be considered.
Voltage drop = I•R;
2
Watts = I
•R (I = maximum continuous current of the load).
6. When mounting the switch on an ungrounded machine, ground the switch housing
by connecting your ground lead to one of the switch mounting screws.
Figure 1
Actuator
sensing face
sensing face
Switch
Mounting Configurations
Figure 2
Perpendicular
Door
Actuation
Actuation
Best
Best
The parallel actuation can result in on/off/on signal if the actuator passes by the
switch rather than coming to rest in proximity to it. This is NOT a recommended
configuration for safety interlock applications.
Wiring Diagram for Category 3
Inputs shown with safety gates/guards in closed position. One Series 300-BT GuardSwitch
( – )
INT-03-230: 230V AC
INT-03-120: 120V AC
INT-03-024: 24V DC
( + )
R e q u i r e d F a s t o r
S l o w - A c t i n g F u s e :
( 2 5 0 V , 5 x 2 0 m m F )
I N T - 0 3 - 2 3 0 : 4 0 m A
I N T - 0 3 - 1 2 0 : 8 0 m A
L1
L2 1
–
I N T - 0 3 - 0 2 4 : 1 / 4 A
Safety Monitor Relay
INT-03
SAFE
A
B
Required Fast or Slow-
Acting Fuses: 4A (250V,
5x20 mm F
230 VAC
LOADS
60 VDC
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
Parallel Actuation
Pivot Actuation
Not Recommended
Good
RESET
W
H
T
2
X1 X2 Y1 Y2
+
N.O.
N.C.
*300-BLT-
*Or other DPST GuardSwitch
OUTPUTS
(See the 300-BT Series installation instructions)
AUX.
C
D
E
F
G
Note – The LED on the BLT model will be ON when the guard is open
Fuses: 1 A (250 v)
Multiple DPST GuardSwitches – Shown with actuators in position, all guards closed.
120 VAC
30 VDC
BLK
CIR. 1
WHT
BLUE
CIR. 2
RED
BRN
CIR.3
ORG
*Circuits shown with magnet actuator away from switch.
S1,S5
Normally open reed switch, closed when actuator is within 0.6"
S2, S3
Normally open reed switches, will close if misaligned or tampered with a
standard magnet
S4
Biased closed reed switch, open when actuator is between 0.3" and 0.6"
N.O. circuit: Black and white wires.
N.C. biased tamper circuit: Red and blue wires.
N.O. monitor circuit: Orange and brown wires.
™
required for each safety gate.
Series Circuit
R
B
W
R
B
B
B
E
L
H
E
L
L
L
D
U
D
U
K
T
K
*300-BLT-
The L.E.D of the BLT model will be on when the guard is open. If multiple guards
are open, L.E.D will be dimmer. The maximum number of GuardSwitches that can
be used is 50, although troubleshooting and line resistance must be considered.
(Do not exceed 30 Ohms of combined contact and line resistance. Each GuardSwitch
will have less than 0.5 Ohms of resistance.)
Circuits*
without LED
S1
BLK
CIR. 1
WHT
S4
BLUE
S2
S3
CIR. 2
RED
S5
BRN
CIR. 3
ORG
Parallel Circuit
W
R
B
B
H
E
L
L
D
U
T
K
*300-BLT-
Circuits*
with optional LED
S1
Optional LED
S4
D1
D2
S2
S3
S5
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