YZ Engineering Guide
Form: 161.01-EG1 (0618)
10
The variable speed drive provides automatic displacement power factor correction to 0.95 or better at all load conditions.
Separate displacement power factor correction capacitors are not required. The displacement power factor is 0.98 or
better when the optional harmonic filter is provided. Additionally, variable speed drives provide the following advantages:
Lowest chiller operating cost through part load energy savings.
Soft start with input current less than full load current.
Smooth acceleration reduces stresses on motor and driveline.
Rugged and reliable with no moving parts.
Standard features include: a door interlocked lockable circuit breaker; UL/cUL listed and CE approved ground fault
protection; over-voltage and under-voltage protection; 3-phase sensing motor over-current protection; single-phase
protection; insensitive to phase rotation; over-temperature protection and readouts of important values on the OptiView
™
control panel.
OPTIVIEW
™ CONTROL CENTER
Note
: Please refer to the YZ Operations & Maintenance Manual (161.01-OM1) for a complete description of features and
functionality.
The YORK® OptiView
™ Control Center is a factory mounted, wired and tested microprocessor based control system for
centrifugal chillers. It provides control of chiller operation and monitoring of chiller sensors, actuators, relays and switches.
As part of the capacity control logic, OptiView
™ controls the leaving chilled liquid temperature and adjusts the motor
current via control of the Variable Geometry Diffuser (VGD) and Variable Speed Drive (VSD).
The panel comes configured with a full screen graphic display mounted in the middle of a keypad interface with soft keys.
The operator may view a graphical representation of the historical operation of the chiller as well as the present operation.
The locations of various chiller parameters are clearly marked, and instructions for specific operations are provided on
many of the screens. To prevent unauthorized changes of setpoints and operating conditions, security access is provided
with three different levels of access and passwords.