York YK-EP, Operation And Maintenance Manual

Page: 65 / 268

Table 50: Display only
Field/LED name Description
ACC Surge Detected (LED)
Only displayed if equipped with a VSD or MVVSD. Illuminates
momentarily when a surge is detected by the ACC function in
the Microboard, while the drive is running at less than maximum
frequency.
VGD Count
Displays the number of times the Stall Detector Board output
voltage goes above the High Limit Setpoint. The count can be
cleared with an ADMIN access level using the VGD CYCLE COUNT
key on the VGD SETPOINTS Screen.
VGD Time ( __Days __Hrs
__Min __Sec)
Displays the accumulated time the Stall Detector Board output
voltage is greater than the High Limit Setpoint while the chiller is
running.
Control Status
Displays the current state of the VGD control. The states are: Stall
Waiting, Stall Reacting, Probing, Surge Reacting, Surge Waiting, Hot
Gas Override.
Time Remaining
While the VGD is in the Stall Waiting State, displays the time
remaining in the Probe Wait Time interval (value programmed as
the Probe Wait Time setpoint).
Diffuser Gap Control Mode Indicates whether the VGD is under manual or automatic control.
Table 51: Programmable
Button Access level Description
[VGD] Open
(Manual)
Service
This key puts the VGD in manual mode and sends an OPEN
command to the VGD
[VGD] Close
(Manual)
Service
This key puts the VGD in manual mode and sends a CLOSE
command to the VGD.
[VGD] Hold
(Manual)
Service
This key puts the VGD in manual mode and sends a HOLD command
to the VGD.
Table 52: Navigation
Button Access Level Description
Home View Returns user to HOME Screen.
Compressor View Returns user to COMPRESSOR Screen.
VGD
Setpoints
Service
Move to the subscreen that allows programming of the Variable
Geometry Diffuser setpoints
65 YK-EP Style B Centrifugal Chiller