Chapter 12.0 Guide Specifications
This section contains written specifications for the TTS/TGS/TTH/TGH series compressors for use in system design
specifications.
12.1 General
Construction shall utilize a two-stage, variable-speed, centrifugal compressor design requiring no oil for lubrication.
Compressor shall be constructed with cast aluminum casing and high-strength thermoplastic electronics enclosures.
The two-stage centrifugal impellers shall consist of cast and machined aluminum. The motor rotor and impeller
assembly shall be the only major moving parts.
12.2 Refrigerant
TTS and TTH compressors are designed for use with R134a and R513A while TGS and TGH compressors are designed
for use only with R1234ze(E) and R515B.
12.3 Compressor Bearings
The compressor shall be provided with radial and axial magnetic bearings to levitate the shaft, thereby eliminating
metal-to-metal contact, and thus eliminating friction and the need for oil. The magnetic bearing system shall consist
of front, rear, and axial bearings. Both the front and the rear bearings are to levitate the shaft at X and Y directions,
and the axial at Z direction. Each bearing position shall be sensed by position sensors to provide real-time
repositioning of the rotor shaft, controlled by onboard digital electronics.
12.4 Capacity Control
The compressor shall have a VFD for linear capacity modulation, high part-load efficiency, and reduced in-rush
starting current. It shall include an Inverter that converts the DC voltage to an adjustable three-phase AC voltage.
Signals from the compressor controller shall determine the inverter output frequency, voltage and phase, thereby
regulating the motor speed. In case of power failure, the compressor shall be capable of allowing for a normal de-
levitation and shutdown.
Compressor speed shall be reduced as condensing temperature and/or heat load reduces, optimizing energy
performance through the entire range of capacity. Capacity modulates infinitely as motor speed is varied across the
range. IGVs shall be built-in to further trim the compressor capacity in conjunction with the variable-speed control
to optimize compressor performance at low loads. Refer to Danfoss LLC Selection Software for performance
calculations and limits.
12.5 Compressor Motor
The compressor shall be provided with a direct-drive, high-efficiency, permanent-magnet synchronous motor
powered by PWM voltage supply. The motor shall be compatible with high-speed variable-frequency operation that
affords high-speed efficiency, compactness and soft start capability. Motor cooling shall be by liquid refrigerant
injection.
12.6 Compressor Electronics
The compressor shall include a microprocessor controller capable of controlling magnetic bearings and speed
control. The controller shall be capable of providing monitoring, including commissioning assistance, energy
outputs, operation trends, and fault codes via a Modbus interface.
12.7 Ancillary Devices
A check valve shall be installed on the discharge port of all compressors to protect against backflow of refrigerant
during coast down. It is recommended that the valve be located after the properly designed discharge cone
adapter; preferably close to the condenser in the packaged system. The system must include an appropriately sized
5% impedance Line Reactor. One Line Reactor is required for each compressor and cannot be shared among
multiple compressors. Please refer to the Spare Parts Selection Guide.
M-AP-001-EN Rev. S-9/8/2021 Page 73 of 136
Содержание Turbocor TTS Series
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