Hobart GPU-600 Series, Operation And Maintenance Manual

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OM-2244 / Operation and Maintenance Manual
DCS-600/ Series 500082 / Solid State Transformer-Rectifiers
December 15, 2014 Chapter 2-3
Page 3
h) Inspect the output contactor. If the contacts are badly burned, the contactor should be replaced as
soon as possible. Slightly pitted and burned contacts can be cleaned up with a commercial contact
cleaner and very fine-grained emery cloth or equivalent.
i) Turn the fan blade by hand to make sure that it turns freely.
j) If required, lubricate the fan (refer to the next section for the lubrication schedule).
k) When finished with inspections:

Return the circuit board panel to its closed position and secure with the screw.

Replace the top cover.

Turn on power at the source and check for normal operation.
6) Lubrication
No lubrication is required, except for the fan motor. The fan motor incorporates a sleeve bearing, and
therefore requires periodic lubrication.
a) Lubrication Schedule
The following table shows the fan
motor manufacturer’s recommendations for lubricating the motor.
Type of Duty Usage
– Starts
Per Hour
Usage
– Hours
Per Day
Lubrication
Interval (years)
Light 0
– 4 starts
0
– 8 hours
Every 4 years
Moderate 5 - 10 starts 9
– 16 hours
Every 3 years
Heavy Over 10 starts 17 - 24 hours Every 2 years
Fan Motor Lubrication Schedule
Figure 2
Lubricate more frequently in dirty environments (3, 2, or 1 years instead of 4, 3, or 2).
b) Oil Type
Use SAE-20 or 10W30 electric motor or automotive oil. Do not use definite purpose oils such as
those for sewing machines, cleaning, rust preventative, or cutting applications.
c) Quantity
Use 10
– 15 drops per end (approximately 1.0 cc or 1/8 teaspoon). Do not over oil.