Yaskawa GPD 506/P5 Section One - Manual (Page 44)

PP.P5G5.01.Troubleshoot
Page 44
Rev. 06/11/2003
Cooling Fans
for models 18kw through 160kW
230V and 460V, 18kW through 160kW models have
a 24V DC cooling fan and one or more 230V AC fans
that blow air across the heat sink on the back of the
unit. 600V, 18kW through 160kW models have one or
more 230V AC fans that blow air across the heat sink
on the back of the unit. If the cooling fan(s) are not
working properly, the inverter will trip on an overheat
fault.
Visually check the cooling fans to make sure that
they turn freely. If there is no physical evidence that a
fan is bad, the motor on the AC fans can be checked
with an ohmmeter. Using an ohmmeter, measure
across the fan motor terminals. If the fan motor is
good, the measured value should be close to 500
ohms. If the measured value is 0 ohms, we can
conclude that the motor is shorted, or if the measured
value is infinite ohms, we can conclude that the motor
is burned open. If the DC fan is not working, then
disconnect the fan and apply 24 VDC to the fan to test
the motor.