HEIDENHAIN MANUALplus 620 Technical Manual page 975

Temperature
model,
second order
January 2012
The following values (entries in the motor table) are required for the second-
order temperature model to calculate the temperature (default values [axis/
spindle] are valid for the entry "0"):
F-DC [Hz]:
This parameter is not evaluated for the CC 422.
Lower limit frequency for the transition of traverse to standstill with the
CC 61xx and CC 424.
F-DC = 0 – Default value (0 Hz) is active
F-DC > 0 – Input value in Hz is active
T-DC [s]:
Thermal time constant for operation at standstill (not evaluated at present)
F-AC [Hz]:
Upper limit frequency for the transition from standstill to traverse.
F-AC = 0 – Default value (0 Hz) is active
F-AC > 0 – Input value in Hz is active
Tth [s]:
1
Thermal time constant for the transition from winding to housing
Tth = 0 – Default value (0 s) is active
1
Tth > 0 – Input value in [s] is active
1
Rth [K/W]
1
Thermal resistance for the transition from winding to housing.
Rth = 0 – Default value: 0 K/W
1
Rth > 0 – Input value in [K/W] is active
1
Tth [s]:
2
Thermal time constant for the transition from housing to coolant
Tth = 0 – Default value: 10 s for axes, 150 s for ball screw
2
Tth > 0 – Input value in [s] is active
2
Rth [K/W]:
2
Thermal resistance for the transition from winding to coolant
Rth = 0 – Default value: 0 K/W
2
Rth > 0 – Input value in [K/W] is active
2
When the CC starts up, the current motor temperature (KTY sensor) is taken
into the calculation model in order, for example, to compensate any
excessive temperatures.
Note
All parameters have to be entered for the model to become active. If a
parameter is missing, the
first-order temperature model becomes active, either with the thermal
time constant "Tth2" or with "T-AC."
6.17 Monitoring Functions 975