Emergency DT1 DALI-2: exam questions with worked answers

Questions for the "Emergency DT1" topic

1. Q01

   A DALI DT1 Function Test simulates a 30-second mains outage to verify that the emergency luminaire switches over to battery; the result (OK / Battery Fault / Lamp Fault) is reported back to the controller for an EN 50172-compliant audit trail.

   TrueFalse

   13. Emergency DT1· Function Test· Hard

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   Correct answer

   True

   Learning tip

   The Function Test is the standardised monthly test required by EN 50172: it lasts about 30 s (long enough to verify turn-on), opens the internal mains relay so the battery takes over, and checks that the LED lights up at or above the minimum luminance threshold. Results are stored in MB202 (the Emergency Memory Bank) with date and result code, and are queryable from a central controller. Automation produces a strong ROI, typically saving 80 percent of the manual inspection effort.

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2. Q02

   The DALI DT1 Duration Test verifies the battery autonomy of an emergency luminaire by simulating a long mains outage (typically 1 h or 3 h depending on the EN 50172 category); a failure indicates an end-of-life or faulty battery that requires replacement.

   TrueFalse

   13. Emergency DT1· Duration Test· Hard

   ▸

   Correct answer

   True

   Learning tip

   The Duration Test is the annual test required by EN 50172. Emergency luminaire categories under EN 50172 mandate a minimum 1 h autonomy (categories 1, 2 and 3), with a nominal autonomy generally of 1 h, going up to 3 h for specific installations. The test must be scheduled outside of occupancy hours (night or weekend). A failure means the battery is at end of life and must be replaced — typical battery life is 4-7 years.

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3. Q03

   The DALI DT1 'Inhibit' (or 'Rest Mode') temporarily disables an emergency luminaire during planned building maintenance, avoiding spurious tests during the intervention; the gear returns automatically to normal mode after a timeout.

   TrueFalse

   13. Emergency DT1· Inhibit Mode· Medium

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   Correct answer

   True

   Learning tip

   Inhibit / Rest Mode is used for planned electrical maintenance with scheduled mains outages. Without it, every outage triggers the emergency luminaires, discharging their batteries ten times faster than usual and raising false alarms. Activation is either manual (by a technician) or automatic (via schedule). A safety timeout returns the gear to normal mode after N hours (typically 8 h max) to prevent forgotten inhibits, and the audit log records every inhibit event.

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