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RVS-DX, Digital Soft Starter Instruction Manual—04/01/04
3-5
Operating “Inside the Delta”
Using the RVS-DX soft starter “inside the delta” reduces the required soft starter rating by 1.73 ( √3)
factor. For example, for a 150 amp, 460 volt motor, the RVS-DX-170-D is selected to operate in
standard “line” mode. However, for “inside the delta” mode (150 amp÷1.73=87 amps), the RVS-
DX-105-D can be selected, thereby, reducing cost and physical space in the application.
The following programming parameters are disabled, once the ‘inside the delta’ is selected:
• Pulse Start
• Pump Curve selection (only standard curve available)
• Slow Speed and Slow Speed Reverse
• Phase Sequence
The motor rating for standard “Line” and “Inside the Delta” connections are show here:
HP Ratings are approximate. The RVS-DX should always be sized by the motor full load amps for
“line” starting and the motor FLA/1.73=soft starter FLA for “inside delta”.
Model Number RVS-DX FLA
HP at 460V for
“Line”
HP at 460V for
“Inside Delta”
RVS-DX-8-D 8 5 7.5
RVS-DX-17-D171015
RVS-DX-31-D312032
RVS-DX-44-D443050
RVS-DX-58-D584068
RVS-DX-72-D725085
RVS-DX-85-D 85 60 100
RVS-DX-105-D 105 75 125
RVS-DX-145-D 145 100 170
RVS-DX-170-D 170 125 215
RVS-DX-210-D 210 150 250
RVS-DX-310-D 310 200 340
RVS-DX-390-D 390 300 515