York YK Style H Operation Manual page 188

FORM 160.76-O2
SECTION 3 - DISPLAY MESSAGES
issue date: 6/15/2015
VSD – Low Frequency Detected
After a 20 second bypass after entering System Run, if
the VSD frequency decreases to below 1Hz less than
the minimum allowed frequency for 25 continuous sec-
onds, this shutdown is initiated. The minimum allowed
frequency for the VSD is 25Hz for 50Hz units; 30Hz
for 60Hz units. The Clear Fault key is pressed on the
display.
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JOHNsON CONtROLs