CAUTION: Risk of contact with hot surfaces. Can cause injury. The electronics housing,
humidifier components, fan motor, and some electrical components are extremely hot during
unit operation. Allow sufficient time for them to cool to a touch-safe temperature before
working within the unit cabinet. Use extreme caution and wear appropriate, OSHA-approved
PPE when working on or near hot components.
NOTICE
Risk of improper power-supply connection. Cancause equipment damage and loss of warranty coverage.
Prior to connecting any equipment to a mainor alternate power source (for example: back-up generator
systems) for start-up, commissioning, testing, or normal operation, ensure that these sources are correctly
adjusted to the nameplate voltage and frequency of all equipment to be connected. Ingeneral, power-source
voltages should be stabilized and regulated to within±10%of the load nameplate nominal voltage. Also, ensure
that nothree-phase sources are single-phased at any time.
NOTE: Do not assume that the fan blades will not start to spin. If the motor is in a fault condition, it will
safely shut down. Once the fault condition is cleared, there are certain conditions in which the motor
will automatically resume operation.
EC-fan Fault Conditions
Fault
Condition
Reset Trigger Description
Phase Failure Automatic
One phase ismissing. Inthiscase the motor will come toa stopandthenautomatically restartwhenall phasesare
present.
Locked/Blocked
Rotor
Automatic The rotorisblocked. Once the lockingmechanismhasbeenremoved, the motor will automatically restart.
Hall Effect
Sensor Error
Manual
(Mains/Software)
The Hall Effect Sensorisusedtomonitorfanspeed. If there isa hall sensor communicationfailure withthe
electronics, the motor will stop. Inthiscase there hastobe a manualrestart (either withthe mains power or
software).
Motor Over
Temperature
Manual
(Mains/Software)
The motor will stopintheeventthere isa motor over temperaturecondition. Inthiscase there hastobe a manual
restart(either withthe mains power orsoftware).
Electronics Over
Temperature
Manual
(Mains/Software)
The motor will stopintheeventthere isanelectronicsover temperaturecondition. Inthiscase there hastobe a
manual restart(either withthe mainspower orsoftware).
Line
Under-Voltage
Automatic Oncethe line voltage returnswithinpermittedoperatingrange, the fanwill automatically restart.
Table 11.1 EC-fan Fault Conditions
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