5
installation
Motor Wiring
Wire motor leads as shown on the motor nameplate matching the supply voltage.
Do not deviate from the motor nameplate wiring.
Internal space heaters may be present, depending upon the motor manufac-
turer. For space heater operation and wiring refer to the Marley
“Fan Motor”
User Manual
Z0239042
.
Either of following symbols may be shown on the motor nameplate –
Δ
,
Δ Δ
,
Y
, or
YY
. These symbols represent how the motor is constructed on the
inside and in no way have anything to do with a Delta or Wye electrical distribution
system serving the motor.
When using a starter:
• Set motor overload protection to 110% of motor nameplate amps. This
setting allows the fan motor to operate during cooler weather. During
cooler weather it is common for the motor to draw 6 to 10% higher than
nameplate amps. High amps are common during tower commissioning
when the tower is dry and the ambient air temperature is cool.
Do not start the motor more than four to five times per hour. Short cy-
cling the tower will cause fuses, breakers or O.L.s to operate and will
decrease motor life.
When using a two-speed starter:
• Motor rotation must be the same at slow speed and high speed.
• Single winding motor requires a starter with a shorting contactor.
• Two-winding motor requires a starter with out a shorting contactor.
• All two-speed starters must have a 20 second time delay relay when switch-
ing from high speed to low speed.
Do not start the motor more than four to five times per hour (each low
speed start and each high speed start count as one start).
When using a VFD:
Before beginning, ensure that the motor is rated for “Inverter Duty” per
IEC 60 034 and 60 079.
• Set the VFD solid state overload protection to 119% of motor nameplate
amps and set “maximum current parameter” in the VFD to motor nameplate
amps. “Maximum current parameter” will reduce fan speed and limit amp
Note
Note
Note
➠
