5 Operation
5.1 Controls and Indicators
NOTE: Bimetallic only – refer to temperature controller manual
for solid-state temperature controllers.
[1] System-Power-Switch/Circuit-Breaker and
Indicator Light
The system power switch is also a magnetic type breaker designed
to open the circuit at currents exceeding 30 amps (KB30) or 40
amps (KB50/100) at 230 VAC, or in response to a temperature-
based error with the appropriate controller. The system power
indicator light above the breaker illuminates when the system
power switch is in the On position.
[2] Pump motor On/OFF Switch and Indicator Light
This switch allows the user to switch Off the pump motor during
system warm-up or system maintenance. A circuit breaker (pump
warmup switch) in the pump motor circuit protects the motor
during a stall or an overload condition. The pump motor indicator
light above the switch will illuminate indicating the pump warmup
switch has closed and the melt unit is ready for operation.
[3] Tank Temperature Meter (Bimetallic only)
The tank temperature meter indicates the operating temperature of
the melt tank. It does not indicate the temperature of the supply
hose. (The hose temperature adjustment located behind the front
panel indicates the temperature of the supply hose.)
[4] Tank Heating Indicator Light
This light illuminates when tank heaters are powered. It also assists
the user when making temperature adjustments to the tank
temperature controller.
[5] Overtemperature Indicator Light
This is a protection feature. All KB Series melt units are equipped
with an overtemperature shutoff. If the melt tank's temperature
exceeds the rating of the overtemperature thermostat, the
overtemperature indicator light will illuminate and the
overtemperature thermostat will regulate the melt unit's
temperature. The temperature rating of the overtemperature
thermostat is below the failure temperature of the Viton o-rings in
the melt unit and the Teflon lining in the supply hoses. Should an
overtemperature condition occur, the tank temperature controller
should be replaced if it has failed.
18 KB30, KB50 and KB100 Series Hot Melt Units 19600-159 Rev. A 04/09/09 © Copyright Astro Packaging 2009
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