30
Connecting Additional Safety Devices
The GTO/PRO® 4000 is equipped with built-in obstruction sensitivity. The operator is designed to stop and reverse the gate
within 2 seconds when it comes in contact with an obstruction. However, obstruction sensitivity, although functioning
properly, may not be sensitive enough to prevent bodily injury in some circumstances. To augment your protection against
entrapment, GTO recommends using some form of additional safety device. When installed, contact sensors must be
mounted in compliance with UL 325, Underwriters Laboratories safety standard for gate operators. Review page 5 for
information about mounting requirements for safety edges ("contact sensors").
Refer to the sensor manufacturer’s instructions for
information about installing these devices on a vehicular
gate.
PLEASE NOTE: Contact sensors are not included with the GTO/PRO® 4000.
The GTO/PRO® 4000 will ONLY accept accessory devices with normally open contact output.
Make sure the power switch to the operator is
turned off before connecting safety device wiring
to the terminal blocks. Unplugging the
transformer does not turn power to the operator
OFF.
Contact Sensor Input Connection:
Connect one of the OPEN EDGE contact sensor wires to the
COMMON (COM) terminal and the other to the OPEN
EDGE terminal on the GTO/PRO® 4000 control board.
Connect one of the CLOSE EDGE contact sensor wires to
the COMMON (COM) terminal and the other to the
CLOSE EDGE terminal on the GTO/PRO® 4000 control
board.
Activation of a contact sensor while the gate is in
motion will cause the gate to stop and reverse
within two (2) seconds.
Contact Sensors (safety edges)
If not installing a contact sensor skip to next section.
Although GTO strongly recommends the use of additional safety devices, we do not endorse any
specific brand names. Only use products that are certified and listed to be in compliance with
any applicable UL standards (United Laboratories) and national and regional safety codes.
Call GTO Sales at 1-800-543-4283 for information on compatible
products for your specific application.
Wire from Contact Sensor
(open safety edge)
Wire from Contact Sensor
(close safety edge)
STALL FORCE
M
IN
M
AX
GRN
BLK
RED
RECEIVER
COM
COM
CYCLE
CLOSE
SAFETY
EXIT
OPEN
SHADOW
LOOP
CLOSE
EDGE
OPEN
EDGE
J11
J8
J12
