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Tunnel Master® Jr. User Manual
- Page 11
Chapter 2: Hardware Installation
Figure 2-7. Gate Eye (Switch) Wiring
Gate Switch (Electric Eye) Wiring
IMPORTANT: The Gate switch is the second critical input device to the Relay Box. It is
usually an electric eye system or some type of vehicle position detector located just
before the first piece of wash equipment. This switch signals the Controller that a vehicle is
starting through the tunnel. All equipment turn on points are measured from this switch
to the particular piece of equipment.
See the wash equipment provider for the location of this relay. The following diagram to the Smart
Relay Box starts at the control relay for the sensing device being used. The diagram shows how to wire
the Gate (electric eye) switch into the Relay Box.
24 VAC SUPPLY
(BY OTHERS)
COMMON
NORMALLY
OPEN
ELECTRIC PHOTO EYE
OR OTHER SENSING
DEVICE CONTACTS
GATE (ELECTRIC EYE) DETECTION CIRCUIT
L
N
TMJ RELAY BOX TERMINAL STRIP (TOP)
Gate -
Gate +
Alternate symbol for N.O. Switch
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