Digitax ST Installation Guide 43
Issue: 7
Safety Information Introduction Mechanical Installation Electrical Installation
UL Listing Information
5 UL Listing Information
5.1 UL information
Digitax 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 be
found on the UL website: www.ul.com
5.1.1 Conformity
The 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 is
operating
• The terminal tightening torques specified in Figure 4-1 in Chapter 4 Electrical
Installation on page 25 are used.
• The drive is installed in a type 1 enclosure, or better, as defined by UL50. The drive
has 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 drive
does not comply with UL if MCBs are used in place of fuses. For further information
on 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), the
external power supply must be a UL Class 2 power supply.
5.1.2 AC supply specification
The drive is suitable for use in a circuit capable of delivering not more than 100,000
RMS symmetrical Amperes at 264 Vac RMS maximum (200 V drives), 528 Vac RMS
maximum (400 V drives).
5.1.3 Motor overload protection
All models incorporate an internal overload protection model for the motor load that
does not require the use of an external or remote overload protection device. Overload
protection is provided at 105 % the FLA of the device. The duration of the overload is
dependent on the motor's thermal time constant (a value up to 3000 seconds that is
able to be entered into the drive - default value is 89 seconds). Refer to ‘Menu 4
advanced parameter descriptions’ in the Digitax ST Advanced User Guide for further
information.
5.1.4 Overspeed protection
The drive provides overspeed protection. However, it does not provide the level of
protection afforded by an independent high integrity overspeed protection device.
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