41 of 114M-AP-001-EN Rev. Q
6.4 Motor Insulation Class
All TTS/TGS/TTH/TGH Series compressors have a motor insulation Class H rating or better according to
the NEMA/UL Standard.
6.5 AC Input Line/Power Electronic Component Protection
Most safety regulations require that upstream branch protection be provided to protect input power
wiring, personnel, and switching equipment from damage in the event of an over-current condition or
equipment failure. Standard fuses and/ or circuit breakers do not provide adequate protection for the
compressor’s power electronics components.
User-supplied, properly sized and selected fast-acting fuses must be installed according to the
applicable local, national, and international safety regulations. The fuses must be installed in the line
before each compressor’s AC input terminals. This excludes TGS230 and TTS300 compressors as they
come with fast-acting fuses.
Use only properly rated fast-acting line fuses suitable for semiconductor protection, such as Littelfuse
JLLS series, Siemens Sitor 3NE1 series, or equivalent.
• • • DANGER • • •
• Fast-acting fuses are only for the purpose of reducing the accumulated energy in a compressor’s power electronics caused by a
short circuit event. Properly sized and selected fast acting fuses must be installed.
• Sub-circuit protection must be considered separately in accordance with local electrical requirements.
• User-supplied branch circuit protection must be installed in accordance with local, national, and international safety regulations
(such as NEC/CEC). The fuses must be installed in the line before the compressor’s AC input terminals.
NOTE
Fuse selection must be done using the FLA of the affected compressor to the next highest amp, but in any event should be a
minimum of FLA x 1.25. Fast acting fuses must be installed as close as possible and immediately before the compressor; that is
downstream from the line reactor. (Contact Danfoss LLC for more information).
6.6 Power Line Contactor
The power line contactor is optional. Consult local safety regulations to determine if a contactor is
necessary for your application.
6.7 CE Compliance and EMI/EMC Filtering
To address EMI/EMC problems, Danfoss LLC recommends the installation of a UL-approved
Electromagnetic Interference/Electromagnetic Compatibility (EMI/EMC) filter device on the input
power line. Refer to the Spare Parts Manual for details.
Although all Turbocor compressors are Conformance European (CE) listed, the compliance of the
compressor with the EMC directive depends on the use of the CE EMI/EMC filter provided by Danfoss
LLC (see spare parts manual for further details). If this is not possible because of the nature of your
application and/or installation, an alternative component with the same attenuation characteristics
must be used to maintain compliance with the EMC Directive. It is the responsibility of the user to
maintain compliance with the Directives. Contact a Danfoss LLC sales representative for more details.
Proper installation of the EMI/EMC filter can have a dramatic effect on overall performance. Although
the filter reduces electrical noise on the power lines (conducted emissions), it should be located as
close as possible to the compressor to reduce broadcasting of the noise (radiated emissions) from the
power lines themselves. The capacitors within the filter short the noise to ground so it is imperative
that the filter maintains a good ground. A short, heavy, stranded conductor from the filter chassis
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