User Manual—Version 3.0 Tunnel Master
Jr. System Hardware and Installation
January 2016 17
respectively, then loop the commons together to each relay. This power is
to fire the solenoids and equipment.
A separation of 120 VAC and 24 VAC shall be maintained for all field-wiring
circuits. All 24 VAC circuits must be supplied by a class
2 transformer.
Tighten all wires on the circuit board in the relay box to 20 pound-inches
(2.3 n-m.) Over torquing may cause enclosure breakage.
Relays in the relay box are double pole with independent commons so
that each rel
ay can have two circuits running through it. Commons are
independent to provide a power source to switch two devices through
either the normally open or normally closed circuits.
Relays circuits should be supplied with no greater than 120 VAC 15 amp.
NOTE: This 120 VAC MUST BE A SEPARATE circuit from the dedicated
120 VAC circuit terminated in the lower right corner of the Relay
Box.
A 6.3 amp. 250 fuse protects each relay. Four spare fuses along with LED
fuse test indicators are located at the center of the relay board. (Fuses
should not be replaced with any other device.)
Another approved ¾” conduit needs to be run to
your motor control
center to the relay box and will contain the low voltage wires for clock
(Pulse), gate (Entrance switch) and Tire switch functions.
When using a normally open 2-wire pulse switch, use terminals marked
CLK SINK and PROX
GND.
See Figure4, “Pulse/Proximity Switch Wiring.”
When using a normally open 3-wire pulse switch, use terminals marked
PROX PWR, CLK SINK, and PROX GND.
See Figure4, “Pulse/Proximity Switch Wiring.”
Gate and Tire inputs require a
constant 24 VAC neutral supplied from a
class 2 transformer. The load signal would be terminated to the normally
open pole of the electric eye (Gate) switch.
See Figure5, “Gate Eye (Switch) Wiring.”
See Figure6, “Tire Switch Wiring.”
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