Applies To

ET90000 Series timers

Question / Problem

How do I time an external remote override on my ET90000 Series timer?

Safety Warning

Common Installation / Application Conditions

• An external remote override is required to operate only during specific programmed times.
• A dry contact switch is used, such as the MS-101-WH momentary override switch.
• An unused circuit is available for the override function. In this example, Circuit 2 is used for the override and Circuit 1 controls the main load.
• Commonly used in court and area lighting applications, including tennis, pickleball, and basketball courts.

Step-by-Step Resolution

1. Select an Unused Circuit for the Override

   Choose an available circuit to act as the override circuit. In this example, use Circuit 2 for the override while Circuit 1 controls the main load.

2. Connect COM for the Override Circuit

   Run a wire from the 5V terminal to the COM terminal for the selected override circuit (for example, COM (Circuit 2)) according to your wiring plan.

3. Wire NO to the External Switch

   Connect the NO (Circuit 2) terminal to the input side of the external momentary override switch.

4. Complete Switch Wiring to the Override Input

   Connect the output side of the external switch to the timer’s external override input such as RMT1. Only a dry contact connection should be used; do not apply voltage to the override terminals.

5. Program the Override Circuit Window (Circuit 2)

   Program Circuit 2 with an ON event at the time you want the override to become available and an OFF event at the time the override should stop being available. For example, program ON at 4:15 PM and OFF at 9:15 PM on each day the override should be allowed.

6. Program the Main Load Circuit (Circuit 1)

   Program Circuit 1 so that its final OFF event matches the end of the override window. In the example above, set Circuit 1 to turn OFF at 9:15 PM so lights shut off at the end of the allowed override period.

7. Open the External Override Menu and Select the Override Input

   In the External Override menu on the ET90000, select the override input you wired (for example, External Override 1, corresponding to RMT1).

8. Set the Override Type

   For a push button such as the MS-101-WH, set the override Type to Momentary. For a maintained switch that stays in the ON or OFF position, set the type to Maintained.

9. Select the Controlled Circuits

   Assign the override to the circuit that powers the load. In most applications this is Circuit 1, but you may select additional circuits if required.

10. Set the Activation Mode and Duration

    Set the activation mode to PULSE, then enter the amount of time you want each manual or remote activation to turn the load on. A typical duration is 1 hour for court lighting. When the time expires, the circuit turns off automatically, even if the override window (Circuit 2’s schedule) is still active.

Tips / Additional Notes

• Only dry contact devices should be connected to the external override inputs. Do not apply voltage to RMT terminals.
• If the override does not activate, verify wiring between the external switch and the selected override input and confirm the override type and duration settings.
• Any unused circuit may be used as the timed override circuit. Ensure the main load circuit’s final OFF event matches the end of each override window.
• Keep wiring neat and use appropriate wire gauge and connectors. Confirm all terminations are properly tightened.
• Always follow local electrical codes and applicable installation standards when wiring external overrides and loads.