Danfoss VLT DriveMotor FCP 106 Design Manual

Also see for VLT DriveMotor FCP 106: Operating instructions Operating instructions Operating instructions Design guide Design guide

3.5.6.2 ThermistorThe thermistor is positioned between motor windings. Theconnection for the thermistor is placed in the motor plugat terminal positions T1 and T2. For terminal positions andwiring details, refer to the section Motor Connection in VLT®DriveMotor FCP 106 Operating Guide.To monitor the thermistor, set parameter 1-90 MotorThermal Protection to [1] Thermistor Warning or [2]Thermistor Trip.1330550250-20 °C175HA183.1140003000R(Ω) nominal nominal -5 °C  nominal +5 °C [°C]Illustration 3.10 Typical Thermistor BehaviorWhen the motor temperature increases the thermistorvalue above 2.9 kΩ, the drive trips. When the thermistorvalue decreases below 0.8 kΩ, the drive restarts.195NA439.10ROFFON<800 Ω >2.9 kΩIllustration 3.11 Drive Operation with ThermistorNOTICESelect the thermistor according to the specification inIllustration 3.10 and Illustration 3.11.NOTICEIf the thermistor is not galvanically isolated,interchanging the thermistor wires with the motor wiresmay permanently damage the drive.A mechanical thermal switch (Klixon type) can be usedinstead of a thermistor.3.6 Ambient Conditions3.6.1 HumidityAlthough the drive can operate properly at high humidity(up to 95% relative humidity), condensation must alwaysbe avoided. There is a specific risk of condensation whenthe drive is colder than moist ambient air. Moisture in theair can also condense on the electronic components andcause short circuits. Condensation occurs to units withoutpower. Install a cabinet heater when condensation ispossible due to ambient conditions.Operating the drive in stand-by mode (with the unitconnected to the mains) reduces the risk of condensation.However, ensure that the power dissipation is sufficient tokeep the drive circuitry free of moisture.The drive complies with the following standards:• IEC/EN 60068-2-3, EN 50178 9.4.2.2 at 50 °C(122 °F).• IEC 600721 class 3K4.3.6.2 TemperatureMinimum and maximum ambient temperature limits arespecified for all drives. Avoiding extreme ambient temper-atures prolongs the life of the equipment and maximizesoverall system reliability. Follow the recommendationslisted for maximum performance and equipment longevity.• Although drives can operate at temperaturesdown to -10 °C (14 °F), proper operation at ratedload is only guaranteed at 0 °C (32 °F) or higher.• Do not exceed the maximum temperature limit.• The lifetime of electronic components decreasesby 50% for every 10 °C (50 °F) when operatedabove its design temperature.• Even devices with IP54, IP55, or IP66 protectionratings must adhere to the specified ambienttemperature ranges.• Extra air conditioning of the cabinet or instal-lation site may be required.System Integration VLT® DriveMotor FCP 10634 Danfoss A/S © 12/2018 All rights reserved. MG03M30233