Edwards Signaling 371-BT Series - Manual (Page 2)

Perpendicular
Actuation
Door
Actuation Parallel Actuation
Best Best Not Recommended
Pivot Actuation
Good
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.
Figure 1
Figure 2
Mounting Configurations
Wiring Diagram for Category 3
Inputs shown with safety gates/guards in closed position. One Series 300-BT GuardSwitch ™ required for each safety gate.
Actuator
Switch
conduit
sensing face
sensing face
*300-BLT-
*Or other DPST GuardSwitch
(See the 300-BT Series installation instructions)
( – )
( + )
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
I N T - 0 3 - 0 2 4 : 1 / 4 A
Required Fast or Slow-
Acting Fuses: 4A (250V,
5x20 mm F
W
H
T B
L
K R
E
D B
L
U
*300-BLT-
W
H
T B
L
K R
E
D B
L
U
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.
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.)
RESET
A
SAFE AUX.
B C D
Safety Monitor Relay
INT-03
E F G
OUTPUTS
230 VAC
60 VDC
120 VAC
30 VDC
LOADS
*300-BLT-
W
H
T B
L
K R
E
D B
L
U
Series Circuit
Parallel Circuit
– +
L1 L2 1 2 X1 X2 Y1 Y2
N.O. N.C.
S1
BLK
WHT
BLUE
RED
S2 S3
S4
CIR. 2
CIR. 1
*Circuits shown with magnet actuator away from switch.
S1 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.
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.
GuardSwitch TM Series 300