Nidec Digitax ST Series Installation Manual

Nidec Digitax ST Series Installation Manual Manual pdf 43 page image

Digitax ST Installation Guide 43Issue: 7Safety Information Introduction Mechanical Installation Electrical Installation UL Listing Information5 UL Listing Information5.1 UL informationDigitax ST drives have been assessed to comply with both ULus and cUL requirements.The Control Techniques UL file number is E171230. Confirmation of UL listing can befound on the UL website: www.ul.com5.1.1 ConformityThe drive conforms to UL listing requirements only when the following are observed:• Class 1 60/75 °C (140/167 °F) copper wire only is used in the installation• The surrounding air temperature does not exceed 45 °C (113 °F) when the drive isoperating• The terminal tightening torques specified in Figure 4-1 in Chapter 4 ElectricalInstallation on page 25 are used.• The drive is installed in a type 1 enclosure, or better, as defined by UL50. The drivehas a UL ‘opentype’ enclosure rating.• The correct UL listed class CC fast acting fuses e.g. Bussman Limitron KTK series,Gould Amp-Trap ATM series or equivalent are used in the AC supply. The drivedoes not comply with UL if MCBs are used in place of fuses. For further informationon fusing refer to Table 4-1 Fuse ratings and cable sizes on page 28.• If the drive control stage is supplied by an external power supply (+24V), theexternal power supply must be a UL Class 2 power supply.5.1.2 AC supply specificationThe drive is suitable for use in a circuit capable of delivering not more than 100,000RMS symmetrical Amperes at 264 Vac RMS maximum (200 V drives), 528 Vac RMSmaximum (400 V drives).5.1.3 Motor overload protectionAll models incorporate an internal overload protection model for the motor load thatdoes not require the use of an external or remote overload protection device. Overloadprotection is provided at 105 % the FLA of the device. The duration of the overload isdependent on the motor's thermal time constant (a value up to 3000 seconds that isable to be entered into the drive - default value is 89 seconds). Refer to ‘Menu 4advanced parameter descriptions’ in the Digitax ST Advanced User Guide for furtherinformation.5.1.4 Overspeed protectionThe drive provides overspeed protection. However, it does not provide the level ofprotection afforded by an independent high integrity overspeed protection device.

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