TrilliumSeries™ Adiabatic
Cooler - TRF Operation & Maintenance Manual
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Component Information & Maintenance
Page | 30
Fan and Motor
General
This unit utilizes electronically commutated (EC) axial fan and motor assemblies with integrated speed controller and guard
grill. Fans must rotate without obstruction in the direction indicated by arrows on the equipment. If the unit control type is
customer input the fans will stop when the input signal is within the signal range listed in
. Fans must be started up and
operated at full speed for at least three hours once a month to move the bearings and allow any condensate that may have
ingressed to evaporate.
Signal Type
0 RPM Fan Speed Signal Range
4-20mA
4mA
–
4.8mA
0-10V
0V
–
0.05V
10-0V
10V
–
9.95V
BMS 0-100%
0% - 5%
Table 4. Input Signal Zero Fan Speed Signal Range
:
Rotating equipment.
Risk of serious injury or death. Never step on fan guard grill or
subject the guard grill to load. Do not place any objects on the fan guard grill.
:
Risk of electric shock. Live terminals and connections even with device switched
off. Wait five minutes after disconnecting the voltage at all poles before opening the fan and motor
assembly.
:
Transporting the fan. Injuries from tipping or slipping. Wear safety shoes and cut-
resistant safety gloves. The fan is only to be transported in its original packaging. The fan is to be
transported lying flat, i.e., the motor axis must be vertical. Secure the fan(s) e.g., with a lashing strip to stop
anything from slipping or tipping.
:
High temperature on fan motor electronics housing. Risk of burns. Ensure
sufficient protection against accidental contact.
