Grundfos DMX 24-8 User Manual

24
15.720017-V6.0
DMX model 226 en
6.5 Possible Failures
Failure Cause Correction
Not connected to mains Connect the mains line
Wron
g
mains volta
g
e Re
p
lace the dosin
g
p
um
p
Electrical failure Return the dosing pump to the works for repair
The empty indication has responded. The
empty indication symbol blinks in the display
Remove the cause
The diaphragm breakage indication has
responded. ERROR and MBS are blinking in
the dis
p
la
y
.
Replace the diaphragm.
Leak
y
suction line Exchan
g
e or seal the suction line
Cross-section of the suction line too narrow or
or suction line too lon
g
Check with specification of Grundfos
Clo
gg
ed suction line Rinse or re
p
lace the suction line
Foot valve covered b
y
sediment Sus
p
end the suction line at a hi
g
her
p
osition
Buckled suction line Lay the suction line correctly, check for
dama
g
e
Cr
y
stalline de
p
osits in the valves Clean the valves
Diaphragm broken or diaphragm tappet torn
out
Exchange the diaphragm
A
ir in the suction line and dosin
g
head Wait, until the
p
um
p
has deaerated
Stroke ad
j
ustment set to zero Turn the ad
j
ustment knob in the "+" direction
Medium too viscous or densit
y
too hi
g
h Check the installation
Cr
y
stalline de
p
osits in the valves Clean the valves
Valves not correctly assembled Assemble the valve inside parts in the right
order and check or possibly correct the flow
direction
Injection point blocked Check and possibly correct the flow direction,
or remove the occlusion
Inexpert installation of lines and peripheral
e
q
ui
p
ment
Check for perviousness and correct installation
Dosin
g
head not full
y
deaerated Re
p
eat deaeration
De
g
assin
g
medium Check the installation
Valves
p
artiall
y
soiled or incrusted Clean the valves
Zero-point misadjusted Adjust the zero-point to the actual back
p
ressure
Fluctuations of back pressure Application of a pressure retention valve and a
p
ulsation dam
p
er
Fluctuations of suction hei
g
ht Kee
p
the suction level constant
Siphon effect (admission pressure higher than
back
p
ressure
)
Install a pressure retention valve
Leak
y
or
p
orous suction line or
p
ressure line Re
p
lace the suction line or
p
ressure line
Parts in contact with media not resistant Re
p
lace with resistant materials
Dosing diaphragm worn out (incipient tears) Replace the diaphragm, also observe
maintenance instructions
Fluctuations of mains volta
g
e Decrease the back
p
ressure of the
p
um
p
Variation of the dosing medium (density,
viscosit
y)
Examine the concentration, possibly employ an
a
g
itator
Dosing output of the pump
inaccurate
Dosing pump does not suck in
Dosing pump does not run
Dosing pump does not dose

Grundfos DMX 24-8 Specifications

General

Brand	Grundfos
Model	DMX 24-8
Category	Water Pump
Language	English