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ELECTRICAL
INSTALLATION
OPERATION
The LO-21K can be used with the BEA SBK-111 safety beams, in addition to dry contact safety beams, for retrofit
purposes. Since the SBK-111's are wet output and all other safety beams have a dry output, there are some wiring
differences between the two. The SBK-111 is wired as shown in the wiring diagram.
If using dry contact safety beams, such as BEA’s Microcell, remember these changes:
1. Power the safety beams with the same transformer that is used for the LO-21K.
2. The black/ white striped wire is not used and should be taped off.
3. The gray and purple wires of the LO-21K go to the NO and COM dry contacts of the safety beams.
All LO-21K wiring must be accomplished with the module unplugged. If the red / white
striped and white wires (data wires) touch each other when power is applied, damage to the
unit will result.
The function of the LO-21K with the BODYGUARD / DK-12 is as follows. The LO-21K provides the BODYGUARD /
DK-12 with
information on the position of the door by data lines. These data lines (RED/WHITE & WHITE) enable
the BODYGUARD / DK-12 to be inhibited during the closing cycle of the door and to switch its pattern settings
according to the position of the door. For example, when the door is in its fully open position, a signal will be sent
through the RED/WHITE and WHITE to the BODYGUARD / DK-12 to indicate that the door is in this position, and
the BODYGUARD / DK-12 will switch to a “door open” pattern. Once the door starts to close, the LO-21K will sense
the reversing (change of polarity) of the motor and will inhibit the BODYGUARD / DK-12 for the preset lock out time
delay. During this time, the red LED at the sensor will be off.
In addition to providing communication to the BODYGUARD / DK-12, the LO-21K provides a safety connection
between the safety beams and the door control. The BLACK/WHITE & RED/WHITE wires provide the SBK-111
safety beams with the necessary voltage to operate. If the safety beams are blocked, the GRAY & PURPLE wires
will receive a signal for the LO-21K to trigger the safety of the door control via the BLUE & GREEN wires of the LO-
21K. The safety signal received by the door control will hold the door in its position. If the safety beams are broken
during the closing cycle, the BODYGUARD / DK-12’s pattern will be adjusted to its “door closed” pattern and the
safety of the door will be triggered. When the safety beam path is reestablished, the door will continue to close in
safety swing until the door reaches the fully closed position, at which time activation will be possible only if there is no
detection at the Bodyguard.
RECEIVER
+
-
black/white
gray
NOT
USED
EMITTER
+
-
white
purple
red/white
blue*
green*
brown
orange
brown
green
white
brown
white
red
black
yellow
7
6
5
4
3
2
1
DATA+
DATA-
PWR
PWR
COM
NO
NC
SBK-111/SW
115 VAC
BODYGUARD
DK12
MOTOR
VOLTAGE
MOTOR
*Please note: Connect the dashed lines
(green, blue, black/ white, purple & gray)
ONLY if safety beams are used.
LO-21K
LOCKOUT
RELAY
3100
DOOR
CONTROL
RED
WHITE
24 V
TRANSFORMER
OBSOLETE
