PSD-QS (02/16)
Page 19
5) SureStart
Features
SureStart is a factory installed soft starter that reduces light flicker caused at start-up by scroll
compressor motors. This control has the following features:
60 to 70% reduction in direct in-rush current
Under voltage protection
Motor reversal protection
Self-adjusts for optimal start performance
50/60 Hz compatible
ETL, CE, EMC and RoHs compliant
Tolerant to “dirty power” conditions
Fault LED
Internal current limiting
SureStart is factory wired for the appropriate power supply.
Operation
When the system control calls for compression operation, the compressor contactor will energize. If
the supply voltage is less than “minimum start-up voltage”, a 50 second delay is initiated. At the end
of the delay, another attempt will be made to start the compressor unless the supply voltage remains
unchanged. See Figure 11a for the SureStart Mode of Operation.
SureStart uses an optimated starting process that learns the starting characteristics of the
compressor to further refine the starting cycle on each recurring start.
If the compressor fails to start, the module will terminate the start attempt after 1 second and initiate a
3 minute lockout before attempting a restart.
While the compressor is running,, if supply voltage falls below the “shutdown on low voltage” limit for
2 seconds, SureStart will stop the compressor and initiate a 3 minute lockout. A restart will be initiated
after 3 minutes if the supply voltage is equal to or greater than the “minimum startup voltage”. This is
done to protect the compressor against a sudden drop in supply voltage.
SureStart is able to detect an interruption in power, when the interruption is 0.1 seconds or longer.
When a power interruption is detected, it will shut down the compressor for 3 minutes. A power
interruption that is shorter than 0.1 seconds may result in the compressor running backwards.
SureStart is able to determine if the compressor is running backwards. If this condition is detected,
the control will stop the compressor for 3 minutes before restart is initiated.
If the run capacitor if faulty or has failed, SureStart will shut down the compressor for 3 minutes before
initiating a restart.
Summary of Contents for Prime-025
Page 15: ...PSD QS 02 16 Page 15 Figure 8 PSD Compressor Unit Electrical Schematic 230 1 60...
Page 16: ...PSD QS 02 16 Page 16 Figure 9 PSD Compressor Unit Electrical Schematic 230 3 60...
Page 17: ...PSD QS 02 16 Page 17 Figure 10 PSD Air Heating Cooling Water Heating Application...
Page 18: ...PSD QS 02 16 Page 18 Figure 11 PSD Air Heating CoolingWater Heating Field Wiring Diagram...
Page 20: ...PSD QS 02 16 Page 20 Figure 11a SureStart Mode of Operation...
Page 27: ...PSD QS 02 16 Page 27 Figure 15 Disassembled Plug Connector...
Page 34: ...PSD QS 02 16 Page 34 Figure 24 PSD Internal Flow Schematic...
Page 35: ...PSD QS 02 16 Page 35 Figure 25 PSD Piping...
Page 37: ...PSD QS 02 16 Page 37 Figure 26 Evacuation of PSD System...
Page 39: ...PSD QS 02 16 Page 39 Figure 27 Initial Charge of PSD System...
Page 41: ...PSD QS 02 16 Page 41 Figure 28 Final Charge of PSD System...
Page 44: ...PSD QS 02 16 Page 44 Figure 32 Start Up Process...
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