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Circuitry for thermistors (Winding Sensors)
Special features:
- In conjunction with a thermal overload protection device this circuitry provides sensible protection for your motors, particularly when using electronic brakes.
Technical data:
- Designation
- Therm
- Supply voltage
- 230 V~, 400 V~
- Max. switching current
- 100 mA ( undervoltage trigger)
- Function
- Temperature-dependent resistor (PTC), micro-switch elements with bimetal triggering
- Connection
- Via motor lead 1-pole or 2-pole (2-pole necessary for switchgear KB-S-30)
Use in Series :
- All series with undervoltage trigger
- K100, K400, K400D, K570, K590, K700, K900, K2000 1Ph, K2000 3Ph, K3000 1Ph, K3000 3Ph, K3500, K4000, Custom housing
Circuitry examples for thermistorss:
K700 without a brake [pdf-File]
K900 without a brake [pdf-File]
K2000 without a brake [pdf-File]
K3000 with a brake [pdf-File]
Release-free mechanism:
Series K2000 and K3000 switches are equipped with release-free switchgears. This means that the machine cannot be started if a temperature sensor has responded. Series K100, K400, K400D, K590, K700 and K900 are normally switches mechanically. In this case the machine can be started but operation is impossible because the thermistors lies within the selfholding circuit of the power contactor. Circuit arrangements are also possible on request to prevent starting in these cases as well. If you want this arrangement, add "el" to the designation "Therm".
Designation for release-free mechanism: Therm-el
Functional description:
The winding temperature is monitored directly by built-in-thermistorss. If overloading occurs and the winding is heated to an unacceptable level, the thermistorss trigger the power contactor. Hence the motor is switched off immediately. Where release-free switching elements are used, the motor cannot be switched on again until these elements are reset automatically.