Nederman NCF Series Instruction Manual

NCFEN
30
Table 7-1: Malfuncons and causes
Problem Cause Soluon
Fan does not start No electrical connecon Check that the motor and/or command inverter is connected to the
electrical power supply line and is correctly powered
Motor malfuncon Check internal connecons and motor components and replace if
necessary
No connecon between
command inverter and motor
Check for correct connecon between inverter and motor
Command inverter malfuncon Check internal inverter circuits and components and replace if
necessary
Power absorpon much lower
than design value
Rotaon speed too low Increase rotaon speed
Openings or ducng parally
blocked
Eliminate obstrucon
Check the posion of regulaon organs
Impeller parally blocked Eliminate obstrucon
Resistance pressure of system
higher than design value
Check the resistance pressure value of the system
Fluid density lower than
intended value
Check the uid density value
Too high power absorpon Rotaon speed too high Reduce rotaon speed
Resistance pressure of system
lower than design value
Check the resistance pressure value of the system
Incorrect impeller rotaon
direcon
Check impeller rotaon direcon and orientaon
Pre-rotaon of air in opposite
direcon to fan rotaon
Check minimum installaon distances (paragraph 5.1.1) or correct
orientaon of intake with pre-distributors
Fluid density higher than
intended value
Check the uid density value
Power supply to motor with
voltage lower than shown on
idencaon plate
Check for correct voltage of power supply to motor
Defects in motor windings Check for correct motor operaon
Insucient pressure Rotaon speed too low Increase rotaon speed
Fluid density lower than
intended value
Check the uid density value
Air ow greater than intended
value
Check the resistance pressure value of the system
Pulsang operaon Instability of air ow Check operang eld envisaged by operang curve
Fluctuaons in ow due to other
fans operang in parallel
Check for correct installaon on system
Intake air turbulence created by
system near intake opening
Check minimum installaon distances.

Nederman NCF Series Specifications

General

Brand	Nederman
Model	NCF Series
Category	Fan
Language	English