Spindle & Ballscrew Cooling System; Pump Filter - Siemens SINUMERIK 840D Maintenance Manual

4.1.4 SPINDLE &
BALLSCREW COOL-
ING SYSTEM

4.1.5 PUMP FILTER

OCTOBER 2005
WARNING!
Wear safety glasses!
If the fan is turning slowly or not at all, it may require cleaning or replacement. The fan
on the bottom of the junction box has a screen that requires periodic inspection and
removal for cleaning.
The spindle and ballscrew cooling system is made up of a motor pump assembly,
ambient-liquid temperature sensor assembly and a DP5P chiller. As long as there is
power to the machine the chiller pump is circulating DOWFROST™ through the
system. The ambient sensor is used to measure casting/air temperature and the liquid
sensor to measure Dowfrost temperature in the return line. When there is a one degree
temperature differential between the two sensors the chiller is then powered on.
There is a small filter and pressure gauge located on the pump head assembly. Normal
pressure is 3-5 pounds, cooled ball screws are 10 to 30 pounds. If the pressure gauge
shows a pressure above normal the filter should be inspected and cleaned.
Figure 4-1 Pump Filter
MACHINE MAINTENANCE
SIEMENS MAINTENANCE MANUAL
Filter
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