Elevator Mechanic Practice Exam

Car is running normally, but the Fire Service buzzer will not shut off. Why?

1. DC connection shorted

2. EHP 3-2 shorted

3. Fault in BUZ relay

4. Open circuit in FS relay

The correct answer is: EHP 3-2 shorted

The scenario described involves a fire service buzzer that will not turn off even though the car is operating normally. This situation suggests that there is a persistent activation of the fire service feature due to a fault in the relay system associated with this function. An issue with the EHP (Emergency Hoteling and Parking) relay, whether this specific component is shorted or experiencing a malfunction, could prevent the buzzer from shutting off. A short in this relay would create a condition where the system erroneously stays activated, leading to the continuous alarm without an actual emergency state. The other potential reasons, while each has its own implications, would not primarily address the specific functionality related to the buzzer remaining activated under normal operating conditions. The DC connection, any issues with the BUZ relay itself, or a possible open circuit in the FS relay would usually affect the operation of the system in broader terms and not specifically ensure the buzzer's operation as described. Thus, focusing on the EHP relay as a critical control point aligns with the malfunction described—making the assessment of it being shorted to account for the buzzer's failure to turn off a logical conclusion.