Table 4: Cycling shutdown message
Message Description
Two minimum voltage thresholds must be met in order to complete the precharge
cycle. The first occurs 1/10th of a second after pre-charge is initiated and the other
occurs 5 seconds after precharge is initiated. See table below for specific values.
Nominal input voltage
value
1st minimum voltage
value
2nd minimum voltage
value
380-460 VAC 41 VDC 425 VDC
Harmonic Filter - Precharge - Low DC
Bus Voltage
FLTR PCHARGE LOW BUS V FLT
575 VAC 60 VDC 630 VDC
Harmonic Filter - Run Signal
FLTR RUN RELAY FLT
When a digital run command is received at the harmonic filter logic board from
the OSCD logic board, a 1/10 second timer is started. A redundant run command
must also occur on the communication link from the OSCD logic board before the
timer expires or the OSCD will be shut down.
41Liquid-Cooled OptiSpeed Compressor Speed Drive
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