Insulation Resistance (Lead-To-Ground); Winding Resistance (Line-To-Line); Resistance Tables - Grundfos UP XL Série Notice D'installation Et De Fonctionnement

7.4 Insulation resistance
(lead-to-ground)
To check the insulation resistance
(lead-to-ground) of the motor and leads, use a
megohmmeter and follow these steps:
1. Turn the POWER OFF.
2. Disconnect all electrical leads to the motor.
3. Set the scale selector on the megohmmeter
to R x 100K, touch its leads together, and
adjust the indicator to zero.
4. Touch the leads of the megohmmeter
individually to each of the motor leads and to
ground (i.e. L to ground; N to ground, etc.).
Fig. 13 Insulation resistance measurement
Evaluation
The resistance values for new motors must
exceed 1,000,000 ohms. If they do not, replace
power head.

7.5 Winding resistance (line-to-line)

To check the winding resistance of the motor
windings, use a megohmmeter and follow these
steps.
1. Turn the POWER OFF.
2. Disconnect all electrical leads to the motor.
3. Set the scale selector on the megohmmeter
to R x 1, touch its leads together and adjust
the indicator to zero.
4. Using the charts in section
tables for reference, touch the leads of the
megohmmeter to the appropriate pair of
connectors. Check all pairs that are present
and write down and label (RA1, RS1, RS2)
all readings.
– In T-box at L & N: UP will = Speed 3/High
– In T-box at L & N: UPS value depends on
the selected speed (Speed 1, 2, or 3)
– For both UP and UPS: with the terminal
box removed, check all combinations RA,
S1, S2.
5. Compare your readings to the matching
model, phase and voltage listed in the charts
in section 7.6 Resistance
Evaluation
The resistance values must fall within the
tolerances listed in section
tables. If they do not, replace the power head.
7.6 Resistance
tables.
7.6 Resistance

7.6 Resistance tables

Checking connections in the terminal box at the
power connections L and N; see fig.
and 208-230 V.
Connection
L to N
=
(Speed 3)
L to N
115 V =
(Speed 2)
L to N
= 12.97 - 15.23
(Speed 1)
Connection
L to N
= 34.63 - 40.66
(Speed 3)
208 V
L to N
- = 41.57 - 48.81
(Speed 2)
230 V
L to N
= 56.67 - 66.53
(Speed 1)
* T can only be checked with the terminal box
removed; if the thermiks is open the pump will
not run.
L N
Fig. 14 Power connections L and N
14 for 115 V
Ohm value
Nominal
range
6.9 - 8.01 7.55
9.7 - 11.38 10.54
14.10
Ohm value
Nominal
range
37.65
45.19
61.60
15