Commissioning Procedures for Fire Cabinet Centrifugal Fans

Commissioning Procedures for Fire Cabinet Centrifugal Fans

When commissioning a fire cabinet centrifugal fan, start at low speed to verify that the rotation direction is correct. When starting at high speed, stop the fire cabinet centrifugal fan before starting to prevent the switch from slipping and the motor from being damaged by high-speed rotation. You may perform either full-voltage or reduced-voltage startup. However, please note that the starting current during full-voltage startup is approximately 5 to 7 times the rated current, while the starting torque during reduced-voltage startup is proportional to the square of the voltage. If the system capacity is insufficient, reduced-voltage startup must be used. During trial operation, at least two people are required: one to control the power supply and the other to observe the fan’s operation. If any abnormalities occur, stop the machine immediately and inspect it. 1. First, verify that the direction of rotation is correct. 2. Immediately after starting the fire cabinet-type centrifugal fan, check whether the operating currents of each phase are balanced and whether the current exceeds the rated current. 3. If an abnormality occurs, shut down the unit, wait for 5 minutes, then restart to verify that the abnormality has been resolved. Only restart after confirming that everything is normal. The motor power required by the fire cabinet centrifugal fan is relatively high under specific operating conditions, particularly when the fan housing and air inlet are fully open. Operating with the inlet fully open may result in motor damage. During the trial run, close the valves on the fan’s inlet or outlet ducts, and slowly open them after startup until the necessary operating conditions are met. Please monitor whether the operating current of the fire-rated cabinet-type centrifugal fan exceeds the rated current. When the fan reaches normal speed, measure the input current to ensure it is within normal limits; the operating current must not exceed the rated current. If the current exceeds the rated value, verify that the supply voltage is normal. If there are discrepancies in the operation of different axial components, these can be detected during the test run to improve overall efficiency.