VSD operation
OptiSpeed compressor drive overview
The new YORK
®
OptiSpeed Compressor Drive (OSCD) is specifically designed for the application of
driving a permanent magnet high speed motor with magnetic bearings used on the YORK Model
YMC
2
Centrifugal Liquid Chiller. This type of design allows the chiller to be designed as a complete
system, and take full advantage of the strengths of each major component within the system. This
method of design is a superior approach to using general purpose components off the shelf that
may not work well together.
This new OSCD design builds on the successes of previous designs of being chiller mounted,
provide for high levels of energy savings, great integration with the chiller control center, liquid
cooled, shell and tube heat exchanger, use of fast switching power modules, high reliability, and
ease of service.
New features include the following:
• The option of a circuit breaker or disconnect switc
• Ground fault detection even when a disconnect switch is selected
• Direct liquid cooling of power modules
• A more accessible cooling system
• Variable voltage input
• High speed direct drive motor
• The Harmonic filter is standard on all models
• Modular lighter weight power units that can be repaired in the field without complete
replacement
• Ease of maintenance and setup
• Enhanced protection with the Smart Sensor System
OptiSpeed compressor drive features
The new drive design is current available in the following models: HYP0490, HYP0490A, HYP0612A,
HYP0730A, HYP0774, and HYP1278A. The operation of each drive is identical except for the
precharge of the 0490A, 0612A, 0730A, and 1278A amp models. Each drive model has a dedicated
drive logic board. The drive logic board cannot be switched between the drive models. There are
basically two different power assemblies used between the five drive designs. The 0490, 0490A,
0612A, and the 0730A amp drives use a single power assembly that contains all of the power
devices required for the three phases of input and output. The 0774 and the 1278A amp drives have
three power assemblies. Each power assembly contains all of the power devices required for one
phase of input and output.
For the first time, the OSCD is offered with a disconnect switch without giving up the ability
to detect a ground fault. The OSCD contains three input current sensors that will provide the
information for the drive logic board to detect a ground fault condition.
Direct liquid cooling is a much more efficient way of removing heat from the OSCD. This method
also reduces the cooling load on the internal cooling coil. In the past, YORK developed direct
liquid cooling for the inverter power modules, but today YORK is direct liquid cooling the rectifier,
inverter, input inductor, and the output filter inductor.
The cooling system for the OSCD is greatly modified to improve serviceability of the power
electronics. Repair of the power electronics no longer requires access to the back of the drive
YMC
2
Mod B with OptiView
™
Control Center
140
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