Changing Type Of Material - Nordson VersaBlue VBN 50 Manual

5-6
Maintenance

Changing Type of Material

Purging with Cleaning Agent
Safety Valve
X
Fig. 5-3
P/N 7146386A
The old material must be removed from the tank (Refer to Tank, Draining
Material).
NOTE: Before changing the type of material, determine whether the old
and new material may be mixed.
S
May be mixed: Remaining old material can be flushed out of the melter
using the new material.
S
May not be mixed: Thoroughly purge the melter with a cleaning agent
recommended by the material supplier.
NOTE: Properly dispose of the old material according to local regulations.
CAUTION: Use only a cleaning agent recommended by the hot melt
material manufacturer. Observe the Material Safety Data Sheet for the
cleaning agent.
Cleaning agent residue can be flushed out of the unit with new material
before production begins again.
NOTE: Properly dispose of cleaning agent according to local regulations.
Activate the safety valve piston once a month. This prevents the material
from blocking the safety valve.
Procedure
1. Relieve melter of pressure as described in section Installation.
2. Disconnect all hoses.
3. Close hose connections with Nordson port plugs.
4. Mechanical pressure control valves: Measure insertion depth
(Fig. 5-3: of setting screw (dimension X) and make a note. This ensures
that the insertion depth can be reproduced. Then close pressure control
valve.
5. Pneumatic pressure control valves: Shut off compressed air. Operate
the melter at full motor speed and with hose connections closed. Switch
the motor on and off several times.
VBN w/o Control System E 2008 Nordson Corporation