Grundfos SL1 Manual De Instrucciones página 16

To find out whether the pump is fitted with a thermal switch or a
PTC thermistor, measure the motor winding resistance. See table
below.
Without cable
Thermal switch < 50 mΩ
PTC thermistor > 100 mΩ
SL dual voltage concept
To standardize and help minimize part numbers and pump
versions of the SL product portfolio, Grundfos created the 61R
voltage variant. 61R is a dual-voltage (230 V/460 V), three phase,
60 Hz DOL (Direct-On-Line) connected motor.
• Connect 230 V pumps using the low-voltage (delta)
connection.
• Connect 460 V pumps using the high-voltage (star)
connection.
Fig. 10 61R 230 V DOL wired in low-voltage (delta) connection
Fig. 11 61R, 460 V DOL wired in high-voltage (star)
connection
The 61R voltage variant provides a large voltage range for supply
power.
Stated voltage Percentage
[V] variation
230 +/- 10 %
460 +/- 10 %
16
With 10 m With 15 m
cable cable
< 320 mΩ < 390 mΩ
> 370 mΩ > 440 mΩ
Voltage range
[V]
207-253
414-506