Grundfos VersaFlo UPS, Installation And Operating Instructions Manual

Page: 14 / 40

14
5.5 Winding resistance (line-to-line)
To check the winding resistance of the motor wind-
ings, a megohmmeter is required.
To do so, 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 below 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 (RA, RS
1
, RS
2
, R) all
readings.
5. Compare your readings to the matching model,
phase and voltage on the chart on pages 16
and 17.
Evaluation
The resistance values must fall within the tolerances
listed on page 16 or 17. If they do not, replace the
motor.
Internal wiring
UPS
Terminal plug in stator
Single-phase Three-phase 208-230 V
RA: 6-1 or 6-1, 7-2
RS
1
: 12-8 or 12-8, 14-9
RS
2
: 4-10 or 4-10, 5-11
R: 5-9 or 5-9, 7-14
R: 11-12 or 11-12, 1-10
R: 4-6 or 4-6, 8-2
RA: Main winding
RS
1
: Auxiliary winding
RS
2
: Auxiliary winding