MEFE—Mitchell Engineering Food Equipment Pty Ltd
23 Storie Street Clontarf QLD 4019 Australia
www.mefe.com.au | [email protected]
Page 6
+617 3283 4536
Free AU 1800 669 006
6. Other matters Continued
If working for over 10 hours a day, or in summer, the vacuum pump
will adopt the measure of cooling forcefully out of the machine In
order to keep good working state of the vacuum pump.
7. Breakdown analysis and removal
7
-
1 Breakdown and removal of vacuum system
7
-
2 Breakdown and removal of solenoid vacuum valve
Breakdown
Reason
Solving method
Vacuum pump can
’
t draw air up to
vacuum.
Pump won
’
t start
See Table 7
-
3 in detail
The cover of the vacuum room won
’
t close
Press forcefully
Vacuum time relay is damaged
Replace
Valve from pump to vacuum room isn
’
t turned on
See Table 7
-
2 in detail
Vacuum room can
’
t reach the maximum
vacuum degree
Pump can
’
t reach the max. vacuum degree
See Table 7
-
3 in detail
Pipe is leaking
Replace
Pipe joint is loose
Tighten
Small gas cell leaks
Seal ring of vacuum room is broken or scraped
Replace
Upper plane of vacuum room isn
’
t flat
Properly adjust
Solenoid valve leaks, for instance there is air in the
valve of main pipe or the charging valve.
See Table 7
-
2 in detail
Time of air drawing is not enough
Prolong
Vacuum room
’
s cover can
’
t be opened so
that air can
’
t enter into working room.
Air
-
bleed solenoid valve isn
’
t turned on
See Table 7
-
2 in detail
Vacuum room
’
s vacuum degree is normal
but air always remain in the bag.
Bad
reset of hot seal and too short distance
Repair to reset flexibility
Breakdown
Reason
Solving method
The sealing is bad
Dirt is enclosed in sealing area
Remove
Sealing surface is damaged
Repair or replace
Rubber fittings for sealing are damaged
Replace
Wire contact is poor
Starting and stopping are inflexible or
incapable
Fuse is burned out
Replace
Silicon commutation diode is punctured
Replace
Winding is burned out
Replace
Armature elevating part has dirt
Replace
Rusty or broken spring caused block
Replace
Voltage is too low
Air Drawing (vacuum) system diagram:
