Page 39 of 108
M-AP-001-EN Rev. N
Electrical Specications
Most codes 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 codes. The fuses must be installed in the line
before each compressor’s AC input terminals.
Use only properly rated fast-acting line fuses suitable for semiconductor protection, such as
Littelfuse JLLS series, Siemens Sitor 3NE1 series, or equivalent.
6.5 AC Input Line/Power
Electronic Component
Protection
• • • 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 codes (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 Full Load Amps (FLA) of the aected 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 DTC for more information).
6.4 Motor Insulation Class All TT/TG Series compressors have a motor insulation Class H rating or better according to
the NEMA/UL Standard.
The power line contactor is optional. Consult local codes to determine if a contactor is
necessary for your application.
6.6 Power Line Contactor
To address EMI/EMC problems, DTC recommends the installation of a UL-approved EMI/EMC
lter device on the input power line. Refer to the Spare Parts Manual for details.
Although all Turbocor compressors are CE listed, the compliance of the compressor with the
EMC directive depends on the use of the CE EMI/EMC lter provided by DTC (see Accessories
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 DTC sales representative for
more details.
Proper installation of the EMI/EMC lter can have a dramatic eect on overall performance.
Although the lter 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 lter
short the noise to ground so it is imperative that the lter maintains a good ground. A short,
heavy, stranded conductor from the lter chassis to the main ground bus is recommended
for top performance. A battery braid, litz wire, or exible welding cable with many ne
6.7 CE Compliance and
EMI/EMC Filtering
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