Electrobes HT88 Timer Module User Manual

Electrobes HT88 Timer Module

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The HT88 is a versatile timer module with adjustable timing via DIP switches, flexible trigger inputs, and controlled output behavior. A built-in test button and diagnostic LED indicators simplify installation and maintenance.

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Quick Setup & Use

1. Set the DIP switches to select the desired timer duration.
2. Select the trigger contacts configuration using the DIP switch input type: Normally Open (close TRIG contacts to activate) or Normally Closed (open TRIG contacts to activate).
3. Connect power using 10V–14V AC or DC (70mA) and wire the TRIG input using a volt-free contact (closing or opening depending on the selected input type).
4. Connect the output load; the output is identical to the input voltage with a maximum load current of 1A.
5. Optionally press the onboard test button to force the output ON immediately (overrides TRIG input and DIP settings).
6. Use the LED to verify status: constant ON when output is active, and ½ second interval flashing when TRIG is active but output remains off.

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• Check LED at power-up: The LED should flash 3 times (duration of 1 second) when power is first applied.
• Output not turning ON when TRIG is active: If the TRIG input is active but the output remains off (e.g., in delayed output mode), the LED will flash at ½ second intervals—confirm the selected operating behavior and timing.
• Verify DIP switch and TRIG behavior: Ensure the selected input type matches your wiring: Normally Open requires closing TRIG contacts to activate; Normally Closed requires opening TRIG contacts to activate.
• Use the test button to isolate faults: Pressing the test button should force the output ON immediately; if it does not, re-check power and output wiring.