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27. The VFD shall be capable of running on electrical power supplied from a high impedance <br />source such as a standby generator. <br />28. Provide 120 volt power and associated circuitry within the VFD unit to energize the <br />motor space heaters when the motor is off and de -energize the motor space heaters when <br />the motor is on. <br />29. Separate motor overload protection shall be provided in the VFD enclosure. This shall <br />consist of a three phase, temperature compensated, adjustable, Class 20 overload device. <br />An overload shall shut down the VFD, without ramping, until manually reset. Provide <br />auxiliary contacts as required. <br />30. An output line reactor and/or other suitable filter, sized for maximum VFD output, shall <br />be provided on the drive output to the motor. The purpose of this device shall be to <br />attenuate possibly damaging voltage transients and "ringing" effects on the motor feeder <br />cable and motor winding insulation. The reactor/filter shall be designed for mounting <br />within the VFD enclosure, or on top of the enclosure if pre -wired by the manufacturer. <br />G. Protection <br />1. Input/output power phase loss. <br />2. Output single phase ground fault or three-phase short circuit. <br />3. High speed, current limiting input line fuses, if required. <br />4. Input undervoltage/overvoltage. <br />5. Output overcurrent trip protection. <br />6. The controller shall provide for automatic reset subsequent to loss of line voltage. <br />Adjustable restarting time delay relays shall be provided to prevent simultaneous starts <br />for motors 100h.p. and above. <br />7. Electronic motor overload. <br />8. VFD shall automatically shut down if input voltage falls 10 percent below operating <br />voltage for more than 20 cycles, with automatic restart upon return to a stable operating <br />voltage. <br />9. VFD overtemperature. <br />10. Power on self test and watchdog fault protection where microprocessor controlled units <br />are provided. <br />11. Loss of control voltage. <br />12. DC bus over/undervoltage protection. <br />13. Input voltage transient/surge protection. <br />044572017 <br />16483-7 <br />