Vogelsang VX100Q - 11.2 Help

Rotary lobe pump
Operating instructions
VX100Q/VX136Q/VX186Q, VX136QD/VX186QD, VX136QDM2/VX186QDM2
55/61
11.2 Help
Possible cause
Possible measure
Observe notes and
safety notes  chap.
A
Pump is not priming
Fill the pump with fluid.
B
Incorrect direction of rotation
Change the pump's direction of rotation.
“Pump drives and
direction of flow”
C
Pipework causing pump
housing warping
Check the alignment of the pipe to the pump.
If necessary provide a compensator or fix the pipe.
“Installation in pipe lines"
D
Leakage in the suction pipe
Check the suction-side pipe system for leakage.
Gas generation
Vent the suction pipe and pump chamber, fill with
fluid.
E
Suction pipe clogged
Check the free flow of the pipe system on the
suction side.
F
Foreign objects in medium
Clean pump systems. Install strainer in the suction
pipe.
G
NPSH
a
too low (medium
evaporates during feeding)
Increase the suction pipe diameter, shorten the
suction pipe length, simplify suction pipe assembly,
reduce the suction height, reduce the speed, adjust
the medium temperature.
“Installation in pipe lines"
H
Belt tension too low
Tighten in accordance with manufacturer's
specifications.
“Installation of pump and
motor on console"
I
Coupling not correctly
aligned
Check the alignment and align according to
manufacturer's specifications if necessary.
J
Belt drive slips
Tighten in accordance with manufacturer's
specifications.
K
Faulty electrical connection
Check electrical equipment.
“Connection to the power
supply”
Fault in the hydraulic system
Check the hydraulics.
L
Motor speed too low during
variable frequency drive
operation
Install external fan, increase motor speed.
“Variable frequency drive
operation”
M
Stiff running caused by
swollen lobe elastomer
Check the medium resistance of the lobe
elastomer.
“Material description for
rotary lobes”
Stiff running caused by
accumulation of solid matter
in the gaps
Clean pump chamber, increase the gaps  chap.
“Reduction of the starting torque", adjust the drive.
“Repair”, “Connection to
the power supply”
R
Oil level in the gearbox is not
okay
 Chap. “Gearbox"
“Maintenance"
O
Operation-related
fluctuations in buffer
chamber
 chap. “Buffer chamber"
“Maintenance"
P
Mechanical seal damage
Change the mechanical seal,  chap. “Cartridge
mechanical seal change"
“Repair"
Faulty repair of the
mechanical seal
Buffer fluid tank leaking
Check leak-tightness of buffer fluid tank.
“Maintenance"
Q
Seal leaking
 Chap. “Pump with dry buffer chamber"
“Maintenance"
R
Operating pressure too high
Reduce the operating pressure.
“Technical data”
S
Medium viscosity above the
nominal value
Reduce speed. Increase medium temperature.
“Intended purpose”
E
Medium viscosity below the
nominal value
Increase speed, decrease medium temperature,
replace wear parts.
“Repair"
Gap too large
Reduce gaps  chap. “Reduction of the starting
torque" in reversed procedure
“Maintenance"
U
Medium temperature above
the nominal value
Reduce medium temperature.
“Intended use", "Material
description for rotary
lobes"
D
Medium temperature below
the nominal value
Increase medium temperature (after consulting
Vogelsang)
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