Variable geometry diffuser screen
Figure 24: Variable geometry diffuser screen
The VGD screen displays information pertinent to the VGD operation.
Table 42: Display only fields
Field/LED name Description
Active Stall Voltage The stall detector output voltage (x.xx VDC), as received by the microboard, from the stall
board
Active Stall Voltage Type Standard or Enhanced to indicate whether the active stall voltage has enhanced filtering
applied when necessary to normalize flow noise
Mach Number The compressor calculated mach number, based on drive speed and suction conditions
VGD Position The position of the VGD over the range of 0% (fully closed) to 100% (fully open). Displayed as
XXX until calibration procedure is performed by a qualified service technician
VGD Command The position command from the control to the VGD
Discharge Pressure The compressor discharge pressure as sensed by the transducer used for the stall signal
determination
Condenser Pressure The condenser pressure
Head Pressure The resultant of the condenser pressure minus the evaporator pressure
Table 43: Display only fields: LED
LED name Description
Surge Detected The position command from the control to the VGD
61YVAM with OptiView Control Center
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