Shadow 8 User Manual 1139300
Operation 3-3
Setting Operating Mode
You can set Shadow 8 to operate in one of two modes: Automatic Start or Start/Restart
Interlock.
Automatic Start
In Automatic Start operating mode, Shadow 8 powers up with its safety relays “open,”
performs a system initialization test and a self-test, and, if no internal faults are encountered
and no obstructions are present in the sensing field (or a programmable fixed blanking pattern
is satisfied), the system enters the Curtains Unobstructed state (see Shadow 8 Operating
States, page 3-2). When an object is detected in the sensing field, Shadow 8 changes from
Curtains Unobstructed to Curtains Obstructed. After the object has been cleared, Shadow 8
automatically switches to the Curtains Unobstructed state.
Start/Restart Interlock
In Start/Restart Interlock operating mode, Shadow 8 powers up with its safety relays “open,”
performs a system initialization test and a self-test, and, if no internal faults are encountered
and no obstructions are present in the sensing field (or a programmable fixed blanking pattern
is satisfied), the system enters the Interlock state. To switch to Curtains Unobstructed, the
operator must turn the Program/Run/Start key switch to the START position with the sensing
field unobstructed or a programmable fixed blanking pattern satisfied.
When an object is detected entering the sensing field in the Curtains Unobstructed state,
Shadow 8 changes from Curtains Unobstructed to Interlock. Shadow remains in the Interlock
state after the object has been cleared until the operator turns the Program/Run/Start key
switch to the START position and Shadow 8 switches to Curtains Unobstructed. If the key
switch is turned to START when there is an object in the sensing field, Shadow 8 remains in
Interlock.
Operating mode settings are made on option switches SWA 1 and SWB 1 on the Main
Receiver (see page 2-46).
Switches SWA 1 and SWB 1 are set to OFF, the Automatic Start position, by default. To
select the Start/Restart Interlock operating mode, set switches SWA 1 and SWB 1 to ON.
You must set the paired DIP switches on the Main Receiver (except switch 6) to the same position.
If the switches are not set identically, a fault condition is generated.
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