VM Series Maintenance and Safety Manual 704-0212-209 Machine Maintenance 3- 17
Spindle Chiller Temperature Requirement
For all machining centers, the spindle chiller should be set for Differential Temperature
Control.
Hurco recommends the Differential Temperature on the spindle chiller be set to 2
° C
cooler than the ambient temperature to maintain the appropriate liquid temperature.
Refer to Differential Temperature Mode, on page 3 - 17 for details.
Differential Temperature Mode
When the Spindle Chiller is in Differential Temperature Mode, setting the Liquid
Temperature to -2° C programs the spindle chiller to constantly maintain the liquid
temperature 2° cooler than the ambient temperature. If the ambient temperature
changes, the liquid temperature is adjusted to keep it 2° cooler than the ambient
temperature.
With machine power on, the cooler unit starts the cooling process when the temperature
difference between the liquid and the ambient air is greater than the Differential
Temperature setting.
The cooling process stops when the temperature differential between the liquid and the
ambient air is equal to or less than the Differential Temperature setting.
The following table shows the Differential Temperature cooling process as the liquid
temperature changes:
Table 3–2. Differential Temperature Cooling process
Differential at -2° C
No Cool Cool No Cool Cool
Liquid
Temperature
22° C 23° C 23° C 24° C
Ambient Air
Temperature
25° C 25° C 26° C 26° C
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