Xylem IM213R04 S-Drive Constant Pressure Aquavar SPD Variable Speed Pump Control - Manual (Page 13)

Page 13
Conduit, Wire and Fuse Sizing
The use of metal conduit with metal conduit connectors is recommended for all electrical connections. Use the
NEC or CEC to determine the required conduit size for the application.
Refer to the chart below for the minimum allowable wire size for each controller. Note that these wire sizes
are not adjusted for voltage drop due to long cable lengths. Refer to the wire sizing chart in the appendix to
determine the maximum length for the input cable. Refer to the motor manual for maximum output cable length.
The maximum recommended voltage drop on both input and output cable combined is 5%. Standard wire
sizing charts give maximum cable lengths for only input or output cables. Because of this the lengths given in the
table must be adjusted so the total voltage drop does not exceed 5%. For example, if the input wire sizing chart
in the appendix gives the maximum length of 400' and only 100' is used then only 25% of the total voltage drop
(1.25% drop) is used. The maximum output cable length read from the motor‘s wire sizing chart must then be
adjusted to 75% of its value so that the maximum voltage drop of 5% is not exceeded.
Use only fast acting class T fuses. The wire used for the input power connections on models SPD20300 and
SPD20300F must have a temperature rating of 90ºC minimum. All other wire must be rated 75 ºC minimum. The
chart below shows the recommended sizes for wire and fuses for each controller. Note that the wire sizes were
not adjusted for voltage drop due to long cable lengths.
Voltage Frame Size Model Number
Full Load
Output Current Nominal HP
Fuse Size
Generator
Size (VA)
208/230
1
SPD20050
17.8 5.0 30.0 7700
SPD20050F
2
SPD20075
26.4 7.5 40.0 11400
SPD20075F
SPD20100
37.0 10.0 50.0 16000
SPD20100F
3
SPD20150
47.4 15.0 70.0 20500
SPD20150F
SPD20200
60.6 20.0 80.0 26200
SPD20200F
4
SPD20250
76.0 25.0 110.0 32800
SPD20250F
SPD20300
94.0 30.0 135.0 40600
SPD20300F
460
1
SPD40050
8.9 5.0 15.0 7700
SPD40050F
SPD40075
13.2 7.5 20.0 11400
SPD40075F
2
SPD40100
18.5 10.0 30.0 16000
SPD40100F
SPD40150
23.7 15.0 40.0 20500
SPD40150F
SPD40200
30.3 20.0 50.0 26200
SPD40200F
3
SPD40250
37.5 25.0 60.0 32400
SPD40250F
SPD40300
47.0 30.0 70.0 40600
SPD40300F
POWER SUPPLY AND WIRING