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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 /> j 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 /> j 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 /> t <br /> 9 . VFD overtemperature. <br /> 10 . Power on self test and watchdog fault protection where microprocessor controlled units <br /> are provided. <br /> r 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 />