Danfoss iSave 21, Руководство пользователя

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User manual iSave 21
29
180R9221 / 521B1174 / DKCFN.PS.003.A1.02
9.1 Safety regulations
The operator ensures that all inspection and installation work is performed by authorised,
qualified specialist personnel who are thoroughly familiar with the manual.
Before intervening in the iSave/system;
• The power must be shut off and the starting device be locked.
• The pressure in the High Pressure lines must be drained to Low Pressure side.
• The water in all connected pipes must be drained.
The numbers in () correspond to the preferred system design and P&ID
Problem Possible cause Action
VFD can’t start the iSave
at initial start-up.
VFD is not designed for con-
stant torque.
Choose a VFD that is designed
for constant torque.
Ramp-up settings in the VFD is
not correct. VFD is tilting.
Set Ramp-up parameters cor-
rect.
Valve (9) is closed Open valve (9)
Pressure in the HP line (5) is
too high
Start the iSave only when the
pressure in the HP line is low.
Torque on iSave too
high during operation
Pressure difference from HP-
out (5) to HP-in (10) is too high.
Clean or change membranes.
Debris in the booster pump or
iSave.
Wear in the booster pump or
iSave.
Design of the basic plant
doesn’t fit the performance of
the iSave.
Permeate production is
too low (17).
Valves (6), (7), (8) or (16) are
leaking.
Repair or change valve.
Internal leakage in iSave Repair iSave
HP pump flow (2) is to small Incorrect speed on the HP
pump.
Check the HP pump and repair
if necessary.
Pressure on the mem-
branes (5) is too high.
Fouling on the membranes Clean the membranes
Mixing in the iSave is too high. Check flow on LP-in (12) and
adjust flow.
Flow out of the iSave is too
low, causes a recovery rate
that is too high.
Check speed on iSave and
change if necessary.
Booster pump in the iSave is
worn out.
Perform service on the VP.
Pressure on the mem-
branes (5) is too low.
Valves (6), (7), (8) or (16) are
leaking.
Repair or change valve (s).
Internal leakage in iSave Repair iSave
HP pump flow (2) is too small Incorrect speed on the HP
pump.
Check the HP pump and repair
if necessary.
9 Trouble-shooting