Vsd Tuning Screen; Figure 25 - Vsd Tuning Screen - York YK-EP B Operation & Maintenance Manual

FORM 160.87-OM1
ISSUE DATE: 8/24/2018

FIGURE 25 - VSD TUNING SCREEN

OVERVIEW
This screen applies to both Variable Speed Drives
(VSD) and Medium Voltage Variable Speed Drives
(MVVSD). It displays a cutaway view of the chiller
compressor, revealing the Pre-Rotation Vanes. Anima-
tion 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.
Requires a login access level of SERVICE.
DISPLAY ONLY
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 position of the Pre-Rotation Vanes in per-
cent over the range of 0% (full close) to 100% (full
open).
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION

VSD TUNING SCREEN

Delta P/P
Displays the chiller head pressure calculated as (con-
denser pressure - evaporator pressure/evaporator pres-
sure).
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 equipped with a
MVVSD, this is the speed command being sent to the
Drive Logic Board in either Auto or Manual Speed
Control mode.
% Full Load Amps
Displays the motor current as a percentage of chiller
Full Load Amps.
Output Current – Phase A, B, C
Displays the phase current measured to the motor.
LD13828
65
2