Problem Solutions
Valving heads won’t fire 1. Main Breaker: Turn the system power switch to the
On position. If switch light fails to illuminate, the
switch may need replacement. System power switch
should be in the On position and the HAT switch
must be in the Run position.
2. Incoming Voltage: Determine exact voltage of the
melt unit. Insufficient voltage can be the cause of
these problems. Voltage drops are common. Use a
voltmeter to determine whether sufficient voltage is
supplied to the melt unit. Also, the voltage of each
melt unit component must be compatible to the melt
unit or serious damage to the system will occur.
(Refer to section 4.4, Electrical Circuits & Wiring).
Determine coil voltage of the applicator head (I.D.
plate) and check incoming control voltage to
terminal blocks. (Refer to electrical schematic that
came with the melt unit).
3. Refer to the electrical schematic that came with the
melt unit and check the actual wire connections to
ensure that the melt unit is wired properly. If
problem still exists, check the status of specific
components with a voltmeter (system powered), or
with an ohmmeter (system unpowered, wire
disconnected).
4. Adjust the supply hose temperature controller
according to section 5.3 in this manual. Inadequate
supply hose heat can affect the performance of your
hot melt system. If problem persists, see Hose
Controller Replacement, section 8.2, and section 9
for hose temperature controller kits.
5. Determine if applicator is heating by using a surface
temperature probe or a temperature-sensing device.
Do not touch applicator by hand to determine
temperature. Refer to the appropriate applicator
service manual.
6. Clean applicator nozzle. (Refer to section 9,
Maintenance Tools.)
7. Make sure the HAT switch is in Run position. This
allows valving signals to reach the applicator heads.
To check if applicator heads are functioning
properly, place the HAT switch in the Test position.
This will test fire the heads only if an external device
such as a Timer or a DC Driver is not used. If no
external device is used and the head does not test fire
in the Test position, it is possible the head coil could
have failed. If an external device such as timer or a
DC Driver is being used the problem may lie with
the external device. Refer to the external device's
service manual.
© Copyright Astro Packaging 2009 KB30, KB50 and KB100 Series Hot Melt Units 19600-159 Rev. A 04/09/09 39
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