INSTRUCTION, USE AND
MAINTENANCE MANUAL
GB
Page 36 of 66
Problem
Possible cause
Remedy
When a control device is operated
the machine does not move at all.
a)
Solenoid valve not receiving
power.
b)
Solenoid valve jammed.
c)
Transformer fuse blown.
d)
Control unit not set correctly.
a)
Call the after-sales
service.
b)
Call the after-sales
service.
c)
Change the fuse.
d)
Call the after-sales
service.
No pressure in hydraulic circuit.
a)
Power unit motor turning in
wrong direction.
b)
Power unit pump has failed.
c)
No oil in power unit tank.
a)
Restore correct ro-
tation direction by
changing socket con-
nection.
b)
Call the after-sales
service.
c)
Fill power unit tank
with oil
Machine operates in jerks.
a)
Not enough fluid in power unit
tank.
b)
Control unit switch has failed
a)
Top up with oil.
b)
Call the after-sales
service.
VERSIONS WITH INVERTER
The mandrel doesn’t rotate.
a)
The first current threshold has
been exceeded.
b)
The second current threshold
has been exceeded.
c)
Lack of supply.
d)
Insufficient net voltage.
e)
Net voltage too high.
f)
Sudden and short drop of net
voltage.
g)
The second temperature thresh-
old has been exceeded.
a)
Wait for the automatic reset re-
leasing the control.
b)
Disconnect the machine from
the net for 30 seconds at least,
then reconnect. If the problem
persists, check the harness.
c)
Connect the supply.
d)
Shorten the length of possible
extension cable to the machine
or raise the leads section (dis-
connect and reconnect).
e)
Disconnect the machine from
the net for 30 seconds at least,
then reconnect.
f)
Disconnect the machine from the
net for 30 seconds at least, then
reconnect.
g)
The machine does not start until
the temperature does not lower
under the safety limit.
The mandrel does not reach the
maximum speed.
a)
The first temperature thresh-
old has been exceeded.
b)
Raised mechanical resistance.
a)
Let the motor body
cool.
b)
Make the mandrel
rotate loadless for
some minutes. If it
does not accelerate,
call the after-sales
service.
7505-M001-3_B
NAV11N - NAV11NT
NAV11EI - NAV11TEI
