Problem Solutions
Pump motor breaker throws 1. 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).
2. Refer to the electrical schematic 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).
3. Switch the pump motor On/Off switch to the On
position. Allow sufficient time for the melt tank to
reach operating temperature. This will cause the
pump warm-up switch to close, thus completing the
pump motor circuit. Replace pump breaker.
4. Adjusting the flow control valve (F.C.V.) correctly
will produce the desired pumping performance of
your melt unit. (Refer to section 5.3.2 of this
manual.) If the F.C.V. is inoperable, replace or
repair it as specified in section 8.4. (Refer to
section 9 for pump kit information.)
5. The pump motor is normally the last item to check
when troubleshooting. All motors have internal
thermal protection. Switch Off pump motor switch
and allow the motor to cool for approximately 20
minutes. Turn pump switch back On. If the motor
still fails to operate, continue troubleshooting.
Determine which pump motor is mounted in your
melt unit. (Refer to the motor I.D. plate.)
Pump leaks 1. Determine which pump is mounted in your melt
unit. (Refer to the melt unit I.D. plate). The pumping
performance, listed in section 3 of this manual,
depends upon certain pump and pump motor
combinations. (Refer to section 8.4, Pump Flow
Control Replacement and section 9 for pump kit
information.) Tighten F.C.V. and pump mounting
screws. If pump continues to leak, replace the o-ring,
copper shim, and tank gasket.
© Copyright Astro Packaging 2009 KB30, KB50 and KB100 Series Hot Melt Units 19600-159 Rev. A 04/09/09 35
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