Oerlikon GC-Serie Betriebsanleitung Seite 68

5. Checking the operating readiness
Table for 5.1.3.
Operating parameters for extruder pump
parameters permissible operating value
P , pump inlet Minimum values:
E
pressure 0.5 - 5
5 - 50
> 50
> 500
P , pump inlet Maximum value:
E
pressure according to pump character­
istic data sheet.
P , pump Maximum value:
A
outlet according to pump character­
pressure istic data sheet.
T , melt inlet Minimum value:
E
20°C higher than
tempera-
melting temperature of
ture
conveying medium
T , heating Maximum value:
H
350 °C
plate tempera­
ture
M drive Maximum value:
d,
torque The 1,2 times of the max.
torque, but not higher than
90% of the admissible pump−
drive torque. according to
characteristic data sheet.
d =P -P , Minimum value:
P A E
pressure 0.5 - 5
difference 5 - 50
between > 50
pump > 500
outlet and
inlet
Page 62 Customer: Basis Version 05
reaction if values are
exceeded or not
reached
Alarm if not reached
Pas: 3 bar minimum value for a
Pas: 5 bar period of more than 2
Pas: 10 bar minutes.
Pas: 30 bar
Alarm and switch-off
extruder drive if max.
value is exceeded.
Alarm and switch-off
extruder and pump
drive if max. value is
exceeded.
Unblocking of drive
at the earliest 1 hour
after achieving mini­
mum value.
When the max. tem­
perature is reached,
power supply is shut
off.
Disengaging of the
safety clutch or elec-
trical switch−off
Alarm if value not
Pas: 2 bar reached for a period
Pas: 5 bar of more than 5 min­
Pas: 10 bar utes.
Pas: 30 bar
possible danger
Pump filling at the inlet is not
sufficient. Due to this reason,
possible reduction of supply to
the pump and of the bearing
lubrcation flow (insufficient lu­
brication of bearing)
Pump is overloaded
Pump is overloaded
Below the melt temperature,
the polymer is so hard that the
pump cannot be rotated or
could even be destroyed
Possible damage to the hea­
ting plates
Possible damage to pinion and
pinion shaft
Not enough conveying medium
flowing though bearing bushes,
i.e. lubrication is not sufficient.
Order: 000000-000 Edition: 01.20