VSD tuning screen
Figure 45: VSD tuning screen
This screen applies to both Variable Speed Drives (VSD) and Medium Voltage Variable Speed Drives
(MV VSD). It displays a cutaway view of the chiller compressor, revealing the pre-rotation vanes.
Animation of the pre-rotation vanes indicates their position. In addition, this screen allows manual
control of the vanes and manual control of the Command Frequency being sent to drive.
Note: Requires a login access level of SERVICE. Service Technicians must refer to the OptiView
Control Center - Service Instructions (Form 160.76-M1) for operation instructions and explanation
of all programmable setpoints and displayed values.
Table 62: Display only fields
Field/LED name Description
Output Frequency
Displays the frequency at which the drive is operating the motor. This value is
returned from the drive.
Pre-rotation Vanes Position
Displays the present Pre-rotation Vane position as a value between 0% (closed) and
100% (full open).
Delta P/P
Displays the chiller head pressure calculated as (condenser pressure - evaporator
pressure/evaporator pressure).
Temperature Differential (LCHLT –
Setpoint)
Displays the difference between the Leaving Chilled Liquid Temperature and the
Leaving Chilled Liquid Temperature Setpoint.
Frequency Control Mode
Displays whether the Command Frequency to the drive is derived from manual or
automatic frequency control mode.
Command Frequency
When equipped with a VSD or MV VSD, this is the speed command being sent to the
Drive Logic Board in either Auto or Manual Speed Control mode.
% Full Load Amps Displays motor current as a percentage of chiller Full Load Amps.
Output Current Phase A, B, C Displays the phase current measured to the motor.
Pre-rotation Vanes Control Mode Indicates whether the vanes are under manual or automatic control.
[Pre-rotation Vanes] Open (LED) Illuminates when an OPEN command is being sent to the vanes.
[Pre-rotation Vanes] Close (LED) Illuminates when a CLOSE command is being sent to the vanes.
75Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
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