Low Voltage Optispeed Drive With Quick Start Option - York YK Manual

Accessories and Modifications (Cont'd)
JOHNSON CONTROLS
An optional harmonic filter limits electrical power supply distortion from the variable speed
drive to help the building comply with the guidelines of IEEE STD. 519-2014. The filter is
unit mounted within the same NEMA-1 enclosure and is UL listed. The following digital
readout is standard with the optional filter:
• Input kVA
• Total power-factor
• 3-phase input voltage
• 3-phase input current
• 3-phase input voltage total harmonic distortion (THD)
• 3-phase input current total demand distortion (TDD)
• Self-diagnostic service parameters

LOW VOLTAGE OPTISPEED DRIVE WITH QUICK START OPTION

The Quick Start feature is targeted towards data centers and process control applications
where the goal is to re-establish process cooling as fast as possible after a power failure
event. The Quick Start feature does this by reducing the time cycle for chiller restart and
by loading the chiller as fast as possible. Once running, its goal is to rapidly achieve the
leaving chilled water temperature setpoint. The main objective is to provide minimum
downtime and the fastest restart/loading as possible. After the chiller is running and close
to setpoint, it returns to standard YK control to minimize risk.
The Quick Start Feature can be used with a UPS (supplied by others) or without a UPS.
In order to start the most quickly, the OptiView™ control panel and VSD control circuit
(except the trigger board) must be on a UPS. If a slightly longer restart time can be toler-
ated, the UPS is not required.
Depending on the compressor and the horsepower of the drive, a 3 kVA or 4 kVA UPS
(supplied by others) with sine wave output is required to power the OptiView™ and re-
quired portions of the VSD control circuit to 115V - 1 phase - 60 Hz.
Please refer to Form 160.75-TD4; Quick Start Feature for YK Mod G Chillers for additional
information.
Quick Start Feature Availability - This feature applies only to YK chillers with Low Volt-
age Variable Speed Drives.
MEDIUM VOLTAGE OPTISPEED DRIVE
A variable speed drive is factory-packaged and configured for easy remote mounting. It is
designed to vary the compressor motor speed by controlling the frequency and voltage of
the electrical power to the motor. The adaptive capacity control logic automatically adjusts
motor speed and compressor pre-rotation vane position independently for maximum part
load efficiency by analyzing information fed to it by sensors located throughout the chiller.
The variable speed drive is mounted in a NEMA-1 enclosure and comes with a certifica-
tion label from a nation-ally recognized testing laboratory. The connection points between
the drive and chiller are factory labeled. Electrical lugs for incoming power wiring are NOT
provided.
FORM 160.75-EG1 (519)
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