Rexnord-Stephan S4 Catalogue

04-2007 3P0200-XX7. Technical Appendix7.3.7 Protective devicesMotor fault Motor protecting switch Built into the motor windingsThermal Magnetic Thermostats ThermistorsContinuous overload G G G GHigh operating frequency, A A A Gunsuitable operating modeContinuous undervoltage or A A G Govervoltage or incorrect supply frequencyHigh ambient temperature at motor P P G Ginstallation siteInsufficient ventilation, blockage of air flow P P G GFailure of a supply phase P P A GBlockage of rotor G G A GKeyGAPGoodAcceptablePoor or no protection7Thermistor Response temperature 160 °C, design to IEC34-11 and DIN 44081 / 44082Thermostat Response temperature 150 °C, max. 250 VAC, 1.6 A, cos n $ 0.67.3.8 Safe switching of high inductancesa) Switching of multi-pole motor windingsSwitching a multi-pole motor winding in conjunction with unfavorable conductor routing may lead to voltage peaksthat can damage or destroy the winding insulation. It is recommended to equip the supply lines with varistors.b) Switching of brake coilsVaristors must be used to avoid damaging switching overvoltages when switching brake coils on the DC side.The brake rectifiers and brake controllers used by Rexnord-Stephan feature varistors as standard. On principle,special braking contactors or contacts of category AC3 according to IEC 158 must be used for the switching ofbrake coils.T23