28. Cooling Fan
Only the SB 60 and BB 20+ units have a cooling fan that blows air across
the heat sink on the back of the unit. If the cooling fan is not working
properly, the servo will trip on an overheat fault. Visually check the cooling
fan to make sure it turns freely. If there is no physical evidence that the fan
is bad, the motor can be checked with an ohmmeter. Using an ohmmeter,
measure across the fan motor terminals. 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 fan is not
working, then replace the fan.
29.
Regen Resistor Check
On some of the BB models only, the Regen resistor is found underneath the
heat sink. If the resistor is in metal case, it should be checked to ensure that
there isn’t leakage from the lead to the metal casing. Excluding SB models,
the value of the Regen resistor is measured at terminals Y3 and Y4. The
Regen resistor is external on the SB models.
Model:
BB, BZ Resistance
3 100
5 100
7 100
10 50
15 50
20 25
30 12.5
44 12.5
If you find that these readings are different than what you
measure call us, you may need to replace the servopack.
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