MILACRON MFC-G - Unit will Not Start (Display Is Not Illuminated); Unit will Not Start (Display Illuminated); Unit Stops

Temperature Control Units : MFC with G Series Instrument
Page: 44
Milacron Process Support Business
4165 Halfacre Road Batavia, Ohio 45103
Phone: 513-536-2584
www.milacron.com
4.1 UNIT WILL NOT START (DISPLAY IS NOT ILLUMINATED)
A. One or more fuses at the main disconnect device are open (blown). Determine continuity
at each fuse. If continuity is not determined, replace the fuse. Then determine cause of
blown fuse.
B. Control circuit transformer fuse is open (blown). Determine continuity at the control circuit
transformer fuse. If continuity is not determined, replace the fuse.
4.2 UNIT WILL NOT START (DISPLAY ILLUMINATED)
A. Power supply is ON. The operator can determine that electrical power supply to the unit
is “on” when the Display is illuminated. Even with the main power supply on, the unit is
prevented from operating by one of the following conditions:
1. Water supply pressure inadequate. The display shows
a Fault : System Safety screen. The unit is prevented
from operation without adequate water supply pressure
by the electrical panel mounted pressure switch.
Sufcient water supply pressure must be present to
close the switch. Refer to Section 2.3 for additional
information.
2. Motor overload switch opened. The electric motor is protected from overload
conditions by a set of thermal overload relays. These relays will open (trip). If
the overload relay is open, it must be reset before operation can continue. An
excessive ow condition must be isolated and corrected immediately.
3. High temperature limit switch open. The unit is
prevented from operations at temperatures exceeding
256°F by a “high temperature limit switch”. This switch
is installed in the To Process temperature sensor. If this
switch is open (due to a high temperature condition), the
unit cannot be started and must “cool down” before the
“high temperature limit switch” will automatically reset.
4.3 UNIT STOPS
A. The operator should determine the main power supply to the unit is ON by an illuminated
Display. With the main power supply “on”, the unit will be prevented from starting by the
following conditions:
1. Water supply pressure inadequate. The display shows
a Fault : System Safety screen. The unit is prevented
from operation without adequate water supply pressure
by the electrical panel mounted pressure switch.
Sufcient water supply pressure must be present to
close the switch. Refer to Section 2.3 for additional
information.
System Fault Screen.
Indiacates a water supply or
a pump overload fault.
System Fault Screen.
Indiacates a water supply or
a pump overload fault.
High Temp Limit Fault
Screen.