York OPTIVIEW Operation Manual page 70

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
%Input Full Load Amps
Displays the input current as a percentage of chiller full
load amps.
Output Frequency
Displays the frequency at which the VSD is operating
the motor. This value is returned from the VSD Logic
Board.
PRV Position - Gas Path Revision "A" Only
Displays the present pre-rotation vanes position as a
value between 0% (closed) and 100% (full open).
VGD Position - Gas Path Revision "B" Only
Displays the present variable geometry diffuser position
as a value between 0% (closed) and 100% (full open).
Motor Temperatures
Displays the enabled motor winding temperatures for
phase A, B and C. Individual temperatures can be dis-
abled using the TEMPERATURE DISABLE Setpoint.
The software prevents more than 4 of the 6 motor tem-
perature sensors to be disabled. When an individual
temperature is disabled, the temperature data box does
not appear. Any input that registers as open is consid-
ered invalid and displays as XXX.X.
Average Winding Temperature
This value is calculated as the average of all enabled
and valid motor winding temperatures. Any winding
temperature that registers as open, out of range or dis-
abled is not used in the calculation. A maximum of 6
temperatures is used to calculate the average.
Motor Housing Temperature
Display the temperature of the motor housing sensed at
the thermistor on the motor externally.
PROGRAMMABLE
Winding Temperature Protection
The winding displays can be individually disabled us-
ing the TEMPERATURE DISABLE setpoint (ADMIN
access level) on this Screen. The software prevents
more than 4 of the 6 motor temperature sensors to be
disabled.
NAVIGATION
Home
Causes an instant return to the Home Screen.
70
VSD
Returns to the VSD Screen.
Features Applicable to Gas Path Revisions
"B" Only
Compressor Gas Path Revision B uses the motor hous-
ing temperature as the process variable to control the
motor cooling electronic expansion valve. The valve
is opened to lower temperature and throttled closed to
raise it. The target temperature is entering condenser
temperature plus the programmable setpoint offset.
DISPLAY
Motor Housing Temperature Setpoint
Displays the target temperature for the motor cooling
control. It is equal to entering condenser water tem-
perature plus the programmable setpoint offset.
Motor Cooling Valve Command
Output to the motor cooling valve in percent from 0%
(closed) to 100% Opened)
Motor Cooling Control State
Displays whether the motor cooling valve is in Auto or
Manual control.
PROGRAMMABLE
Setpoint Offset
Access Level Required: SERVICE
Determines the target motor housing temperature
above condenser entering temperature. (-10 to 50°F,
default 10)
Minimum Housing Temperature
Access Level Required: SERVICE
Sets the minimum allowable motor housing tempera-
ture. (55.0 to 100.0°F, default 55)
Maximum Winding Temperature
Access Level Required: ADMIN
Sets the maximum winding temperature which enlists
an over-ride of the motor cooling valve control to open
further to not exceed this value. Set at 200°F.
Kp, Ti, TD
Access Level Required: ADMIN
Control gains for the motor cooling valve.
FORM 160.78-O2
ISSUE DATE: 5/22/2017
JOHNSON CONTROLS