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2.4.3 Motor Winding Test
2.4.3.1 Measure the resistance of each motor winding with an ohmmeter. Each
TROUBLE
(a) Unit fails to shut off at 23
psi (1.59 bar)
(b) Unit fails to shut off
between 4 to 8 psi (.28 to .56
bar).
(c) Back flow through pump
with system pressure below
30 psi (2.07 bar)
(d) Unit decouples
(e) Circuit breaker trips.
(f) Motor runs slowly
(g) Incorrect winding
resistance.
2.5 Troubleshooting
PO Box 8975, Vancouver, WA 98668-8975 • Phone: 360/253-2008 • Fax: 360/253-8294
2 Howard Road, Eaton Socon, St.
phase-to-phase should measure 53 ohms with no more than 15%
variation between windings. If any measurement is out of specification,
refer to Troubleshooting.
POSSIBLE CAUSES
(a1) Pressure switch
assembly out of
adjustment or bad.
(b1) Pressure switch out of
adjustment or bad.
(c1) Over - pressure re-lease
setting out of adjustment.
(c2) Over-pressure release
setting parts worn.
(d1) Drive magnet mis-
adjusted
(d2) Drive magnet rubbing on
cup.
(d3) Friction on impeller gears.
(d4) Friction in pump
assembly bushings.
(d5) Driven magnet rubbing on
(e1) Incorrect electrical
cup.
connections.
(e2) Insulation breakdown in
motor.
(f1) Bad winding.
(f2) Drive Magnet rubbing on
cup.
(g1) Short or open in one or
more legs.
MICROPUMP, INC.
A Unit of IDEX Corporation
MICROPUMP
A Subsidiary of Micropump, Inc.
Neots, Cambridgeshire, PE 19 8ET England, • Phone: 011-44-1480-356600 • Fax: 011-44-
LIMITED
356300
Page 17 of 33
CORRECTION
Check and adjust pressure
switch assembly or replace
defective parts as required.
Check and adjust pressure
regulator.
Check and adjust. Replace
defective parts as required.
Check and adjust setting.
Check and replace worn parts.
Check and adjust.
Check and adjust. Replace
defective parts as required.
Check and replace as
required.
Check and replace as
required.
Check and adjust. Replace
Check and correct as required
defective parts as required.
Check and replace motor and
drive housing with pressure
switch.
Check and replace motor and
drive housing with pressure
switch.
Check and adjust. Replace
Check and replace motor and
defective parts as required.
drive housing with pressure
switch.
1480-
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