York YK Style H Operation Manual page 98

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Temperature Differential (LCHLT – Setpoint)
Displays the difference between the Leaving Chilled
Liquid Temperature and the Leaving Chilled Liquid
Temperature Setpoint.
Command Frequency
This is the speed command being sent to the Drive
Logic Board in either Auto or Manual Speed Control
mode.
Speed Decrease Inhibit – Surge Map Point
(LED)
Illuminates when the Microboard ACC function is un-
able to reduce speed due to a mapped surge point. Oth-
erwise, it is extinguished.
Mapping Inhibited (LED)
Illuminates when the Microboard ACC function is not
permitted to map points or reduce speed due to un-
stable Leaving Chilled Liquid Temperature, manual
speed control, current limit in effect (chiller FLA only)
or during Soft Shutdown. Otherwise, it is extinguished.
Surge Avoidance Surge Detected (LED)
Illuminates momentarily when a surge is detected by
the Surge Protection feature. This feature only detects
surges that occur while the drive is running at maxi-
mum frequency.
ACC Surge Detected (LED)
Illuminates momentarily when a surge is detected by
the ACC function in the Microboard, while the drive is
running at less than maximum frequency.
ACC Surge Count
Increments when a surge is detected while the drive is
running at less than maximum frequency.
Surge Map Point Count
Displays the total number of data points contained in
the surge map.
For fields requiring access level of SER-
VICE. Service Technicians refer to the
OptiView Control Center - Service Instruc-
tions (Form 160.76-M1) for operation
instructions and explanation of all pro-
grammable setpoints and displayed values.
98
PROGRAMMABLE
VSD Start Frequency
Sets the starting frequency from which the ramp-up
will begin. Programmable over the following range:
• 60Hz units – 30Hz to 60Hz (default 45Hz)
• 60Hz units with Quick Restart – 30Hz to 45Hz
(default 45Hz)
• 50Hz units – 25Hz to 50Hz (default 37.5Hz)
• 50Hz units with Quick Restart – 25Hz to 37.5Hz
(default 37.5Hz)
Mapping Enable
Sets the Delta T (Leaving Chilled Liquid Temperature
- Setpoint) needed to be met to enable surge mapping
and speed reduction initially on startup. Programmable
over the range of 0.5°F to 20.0°F.
Surge Margin Adjust
This value determines how close the frequency reduc-
tion will be allowed to get to the surge line. Program-
mable over the range of 0.0 (default) to 25.0Hz. Ser-
vice Technicians should refer to Variable Speed Drive
– Service Instructions (Form 160.00-M4) prior to ad-
justing this setpoint.
ACC Surge Sensitivity
Allows the Service Technician to adjust the sensitivity
of the ACC Surge Detection in the Microboard (surges
that occur while the drive is running at less than maxi-
mum frequency). Programmable over the range of 1.5
to 2.5 with default of 2.0. Smaller values increase the
sensitivity.
Auto Map Print (Enable/Disable)
When enabled, the ACC surge map values are printed to
a connected printer each time a surge point is mapped,
as shown in SECTION 4 - PRINTING of this manual.
Surge Map Clear
Allows the Service Technician to clear the surge map.
When this key is pressed, a dialog box appears request-
ing a special password to proceed.
Surge Map Print
Allows the Service Technician to print the entire surge
map to a connected printer, as shown in SECTION 4 -
PRINTING of this manual.
FORM 160.76-O2
issue date: 6/15/2015
JOHNsON CONtROLs