York YK-EP Operation And Maintenance Manual page 118

Table 117: Programmable
Button
ACC Mapping Enable
Surge Margin Adjust
Surge Sensitivity
Manual Surge Point
Table 118: Navigation
Button Access level
Home View
VSD View
Surge Map Service
118
Description
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 1.0°F).
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.
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 1.5 to 2.5 with default of 2.0. Smaller values increase
the sensitivity.
Allows the Service Technician to manually log the present running
operating conditions into the surge map as a valid surge point.
When this key is pressed, a dialog box appears requesting a special
password to proceed.
Description
Returns user to HOME Screen.
Returns user to VSD Screen.
Causes a jump to the subscreen that displays the surge map.
YK-EP Style B Centrifugal Chiller