Danfoss 51 Series Servicehandleiding - Pagina 5

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Danfoss 51 Series Servicehandleiding
Service
Manual
Series
51
and
51-1
Motors
Service
Manual
Troubleshooting
Sluggish system
System
operating hot
Excessive noise or
vibration
Check
Cause
Corrective
action,,
1
Controlorifices
Blocked or restricted orifice
will
cause
sluggish
response.
Orifices installed to the
wrong
locations
will
cause
PCOR
controlto
be
sluggish.
Remove,
inspect and clean
all
orifices.
Ensure
the
appropriate
orifi
ces
are
installed.
2.
Threshold
setting (proportional
controls)
Inappropriately
high
threshold
setting
will
shift
the
motor
at
the
wrong tlme.
Checkthreshold
setting.
AdJust
if
necessary.
3.
Control
spoolor
piston
A
sticky 4-way spool or
control
piston will cause
sluggish response.
Clean
and inspect the 4-way valve spool and
control
piston.
Replace
if
necessary.
4.
Pressure com
pensator
setting
Inappropriately low pressure compensati ng
setti
ng
will
shift
motorto
maximum displacement at
lower
pressure
Check pressure
compensator setting. Adjust
if
necessary.
5.
Control input
signal
An
improper
or erratic
input signalto
the
control
may cause
sluggish response.
Check
input
signal or electric current and correct
if
necessary.
Charge pressure
lnappropriately
low pressure setting at
loop
flushing relief valve may
cause
improper
supply
pressure
to motor control.
Measure
change pressure
in
forward
and
reverse.
Adjust loop
flushing
relief valve
if necessary.
1
System
pressure
Inappropriately low system
pressure
setting
may
cause
sluggish response.
Measure
system
pressure.
Adjust
pump
pressure
limiter
or system relief valve if
necessary.
8.
Internalleakage
Excessive leakage
will
cause
lower charge pressure
and affect performance.
Install loop
flushing
defeat
option
and
monitor
case
flow.
lf case
flow
is
excessive,
motor
may require major
repair.
Contact
your
Danfoss service
provider.
Check
Cause
Corrective
action
'l
Oillevel
Insufficient hydraulic
fluid will
cause
overheating.
Fill
reservoir
to
proper level,
2.
Heat exchanger
Blocked heat exchanger or low
air
flow will not
sufficiently cool the system.
Check
temperature
upstream and downstream of heat
exchanger.
Clean,
repair, or replace heat exchanger
if
necessary.
3.
Loop
flushing
charge pressure
Inappropriately
high
loop
flushing
relief valve
setting
will
reduce or prevent loop flushing
flow.
lmproper
orifice
size
will
not give proper
flow
for
cooling purposes.
Monitor
case
drain
flow.
lf
low
adjust loop
flushing
relief valve setting or replace
with
orificed type relief.
4.
System pressure
lf system relief valve settings
aretoo
fow, excess
heat
will
be
generated.
Adjust system relief valve settings.
5.
Air
in
system
Entrained
air
generates heat under
pressure
and
causes
cavitation
Look
for foam or bubbles in reservoir.
Check
for
leak
on
inlet
side
of charge
pump.
6.
Internalleakage
Excessive
internal
leakage
will
overheat the system. Install loop
flushing
defeat
option
and
monitor
case
flow.
lf case
flow
is
excessive,
motor
may require major
repair.
Contact
your
Danfoss
service
provider.
Check
Cause,
Corrective action
I
Oillevelin
reservoir
Insufficient hydraulic
fluid will
cause
cavitation.
Fill
reservoir
to proper
level.
2.
Air in system
Air bubbles may
lead
to
cavitation.
O
Lookforfoam
or bubbles in reservolr.
Checkfor
leak
on inlet
side
of charge
pump.
|
1
008567
.
Rev BA .
June
201
4