York YK Style H - Page 94

Table 87: Display only fields
Field/LED name Description
Mapping Inhibited (LED)
Illuminates when the Microboard ACC function is not permitted to map points or
reduce speed due to unstable 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 maximum
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.
Surge Detection State
Display the current Surge Detection State. Inactive, Startup Wait, Evaluating Conditions
or Surge Detected.
Note: For fields requiring access level of SERVICE. Service Technicians 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 88: Programmable
Button Description
VSD Start Frequency
Sets the starting frequency from which the ramp-up will begin. Programmable over
the following range:
• 0 Hz to 210 Hz (default 45 Hz)
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 (default 5.0°F).
Surge Margin Adjust
This value determines how close the frequency reduction will be allowed to get to
the surge line. Programmable over the range of 0.0 (default) to 25.0 Hz. Service
Technicians should refer to Variable Speed Drive – Service Instructions (Form 160.00-M4)
prior to adjusting this setpoint.
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 maximum
frequency). Programmable over the range of 0.1 to 20.0 with default of 2.5. Smaller
values increase the sensitivity.
Surge Map Clear
Allows the Service Technician to clear the surge map. When this key is pressed, a
dialog box appears requesting 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 Printing of this manual.
Table 89: Navigation
Button
V09 software
and earlier
V10 and later
with YORK
Chiller Access
Manager
Description
Home View View Returns the user to Home Screen.
Capacity
Control
View View Navigates to the Capacity Control Screen.
Surge Map Service JCI Service Causes a jump to the subscreen that displays the surge map.
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center94