Munsch NPC Series - Page 32

Disturbance recovery
Fault number
12 34
5
6
7
89
Cause
Remedy
–
X
–
X
––––
X
Viscosity or density of the pumped
medium outside the specification range
for the pump
Consult with manufacturer.
–
X
–
X
–––––
Geodetic differential head and/or pipe flow
resistance too high
Remove sediments in pump and/or
pressure pipe.
Install larger impeller and consult with
manufacturer.
–
X
––
XX
–––
Pressure-side armature not opened
sufficiently
Open the pressure-side armature.
XX
––
XX
–––
Pressure pipe blocked
Clean the pressure pipe.
XX
–
X
–
X
–––
Pump running the w rong direction
Swap any two phases at the motor.
XX
–
X
–––––
Motor speed insufficient
Compare required motor speed w ith
specification on pump type plate.
Replace motor if necessary.
Increase motor speed with speed
control if available.
–
X
–
X
–
XX
––
Pump components worn
Replace worn pump components.
––
XX
–
X
––
X Pressure-side armature opened too wide
Throttle down at pressure-side
armature.
Mill down the impeller. Consult with
manufacturer and adjust impeller
diameter.
––
X
––
X
––
X
Geodetic differential head, pipe flow
resistance and/or other resistance lower
than specified
Throttle down flow rate at pressure-si de
armature. Observe the minimum flow
rate limit.
Mill down the impeller. Consult with
manufacturer and adjust impeller
diameter.
––
X
–
X
––––
Viscosity lower than expected
Mill down the impeller. Consult with
manufacturer and adjust impeller
diameter.
––
X
–
XXX
–
X Motor speed excessively high
Compare required motor speed w ith
specification on pump type plate.
Replace motor if necessary.
Reduce mo tor speed with speed control
if available.
––
X
–
XX
––
X Impeller diameter too large
Throttle down flow rate at pressure-si de
armature. Observe the minimum flow
rate limit.
Mill down the impeller. Consult with
manufacturer and adjust impeller
diameter.
XX
–
X
–
X
–––
Impeller out of balance or clocked
Disassemble pump and inspect for
dry-running damage.
Clean the impeller.
–
X
–
X
–
X
–––
Hydraulic components of the pump dirty,
clotted or encrusted
Disassemble pump.
Clean the components.
–– –– –
XX
–
X
Roller bearing in bearing bracket defective
Replace roller bearing.
–– –– ––
X
–
X
Roller bearing in motor defective
Replace roller bearing.
32 NPC series BA-2005.07 EN – 02