11
SA
FE
+
+
O
PE
N
B
O
PE
N
A
O
P
C
L
J1
J5
A
A
A
Fig. 23
5.4.1. Connection of Photocells and Safety Devices
For compliance with UL325 all the entrapment zones generated
by the moving gate must be protected by safety devices. See
Fig. 24 for a typycale example of how safety devices can be
installed to protect entrapment zones.
Opening Safety Devices:
Active only during gate opening movement. When an
obstacle is detected they cause immediate reversing
and resumption of the opening motion on release (see
advanced programming in Section 5.5.2.)
Closing Safety Devices:
Active only during gate closing movement. When an
obstacle is detected they cause reversing, either im-
mediate or on release (see advanced programming
in Section 5.5.2.)
Edge Safety Devices:
Active during the gate opening and closing move-
ments. They cause immediate reversal of motion and
stopping after two seconds.
Encoder:
Monitors for an obstacle during gate opening and
closing movements. It causes immediate reversal of
motion and stopping after two seconds.
Note: For compliance with the UL325 Ed. 6 all safety de-
vices that protect entrapment zones must be monitored.
The 844 operator monitors the safety devices with the FAIL
SAFE function.
See advance programming in Section 5.5.2 tor details on the
different options for Fail Safe.
A minimum of one external de-
vice on opening and one external device on closing must be
connected and monitored.
See the following figures for various
examples of connections.
VAC (Max. 60W)
~ VAC
TOTAL
OPEN
PARTIAL OPEN
STOP
For connection of the
photocells and safety
devices, see Section
5.4.1.
LIMIT-SWITCH
Capacitor
5.4.
ELECTRIC CONNECTIONS
Fig. 24
Closing
photocells
Closing photocells
Opening photocells
"Edge" safety devices
BLUE
AUDIO ALARM
Connection of a pair of monitored opening photocellsa pair of
monitored closing photocells
Fig. 25
SA
FE
+
+
O
PE
N
B
A
O
PE
N
O
P
C
L
+
+
+
+
RX OPEN
TX OPEN
RX CLOSE
TX CLOSE
