7 Operation and regulation
142
HSD S.p.A. © - h0106k01a.fm120718
Thermal alarm temperature thresholds
There are pre-alarm temperature thresholds and alarm temperature thresholds, which must be
taken into consideration.
The pre-alarm thresholds signal excessive heating, and thus a malfunction that must be kept
under control and dealt with as quickly as possible.
Alarm thresholds, on the other hand, must never be exceeded as they indicate a serious
malfunction. When the alarm threshold is reached, the electrospindle must be stopped straight
away and left to cool down.
Respect the temperature thresholds indicated by the manufacturer.
Technical characteristics of the bimetallic switch
MACHINE STOP
Thermal probe
position
Type
Pre-alarm
thresholds
Alarm thresholds
Motor / stator NC bimetal switch not defined*
*
Pre-alarm thresholds cannot be detected with a bimetallic switch.
OFF
(switch open)
Motor / stator KTY84-130 110 °C 130 °C
Motor / stator PTC 130 110 °C 130 °C
Motor / stator PT 1000 110 °C 130 °C
Front bearings PT 100 55 °C 65 °C
Type NC (normally closed)
Power supply 48 V
DC MAX
Current 1.6 A MAX
Switching cycles 10000 Cycles
Contact interruption time < 1 ms
Contact resistance (according to MIL R 5757) < 50 m:
Isolation voltage 2 kV
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