York YK-EP Operation And Maintenance Manual page 117

Table 116: Display only
Field/LED name
Pre-Rotation Vanes Position
Delta P/P
Temperature Differential
(LCHLT – Setpoint)
Command Frequency
Speed Decrease Inhibit –
Surge Map Point (LED)
Mapping Inhibited (LED)
ACC Surge Detected (LED)
Surge Avoidance Surge
Detected (LED)
ACC Surge Count
Surge Map Point Count
Table 117: Programmable
Button
Auto Map Print (Enable/
Disable)
Surge Map Print
Surge Map Clear
VSD Start Frequency
YK-EP Style B Centrifugal Chiller
Description
Displays the present Pre-Rotation Vane position as a value between
0% (closed) and 100% (full open).
Displays chiller head pressure calculated as (condenser pressure -
evaporator pressure/evaporator pressure). This value is calculated
by the Microboard.
Displays the difference between the Leaving Chilled Liquid
Temperature and the Leaving Chilled Liquid Temperature Setpoint.
This is the speed command being sent to the Drive Logic Board in
either Auto or Manual Speed Control mode.
Illuminates when the Microboard ACC function is unable to reduce
speed due to a mapped surge point. Otherwise, it is extinguished.
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.
Illuminates momentarily when a surge is detected by the ACC
function in the Microboard, while the drive is running at less than
maximum frequency.
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.
Increments when a surge is detected while the drive is running at
less than maximum frequency.
Displays the total number of data points contained in the surge
map.
Description
When enabled, the ACC surge map values are printed to a
connected printer each time a surge point is mapped, as shown in
Printing.
Allows the Service Technician to print the entire surge map to a
connected printer, as shown in Printing.
Allows the Service Technician to clear the surge map. When this key
is pressed, a dialog box appears requesting a special password to
proceed.
Sets the starting frequency from which the ramp-up will begin.
Programmable over the following range:
• 60Hz units – 30 Hz to 60 Hz (default 45 Hz)
• 60Hz units with Quick Restart – 30 Hz to 45 Hz (default 45 Hz)
• 50 Hz units – 25 Hz to 50 Hz (default 37.5 Hz)
• 50 Hz units with Quick Restart – 25 Hz to 37.5 Hz (default 37.5
Hz)
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