Temperature Control Units : MFC with G Series Instrument
Page: 25
Milacron Process Support Business
4165 Halfacre Road Batavia, Ohio 45103
Phone: 513-536-2584
www.milacron.com
Some older models have overload relay where a red button that pops out if the
overloads are tripped. Simply push the button in until the overloads are reset.
Other overload relays have a switch. This switch will be positioned with the
indicator pointing up when in normal operation. The indicator will be pointing to
the left when the overloads are tripped. To reset, simply turn the switch to where
the indicator points up.
3. If a motor overload situation persists, the operator must adjust the ow rate to
match the system pressure loss (reduce ow rate) to prevent continual tripping of
the overload relay. This procedure is outlined here:
a. Open electrical cabinet panel door. The panel cover is hinged and held
open by a support cable. Note that the electrical power is engaged at
this point and caution must be observed while the cabinet panel is
open.
b. Identify the motor starter block. This block
consists of the motor starter contactor
and the overload relay.
c. Place an amp meter on a single power
lead coming from the overload relay.
d. Locate the motor name plate on the
pump motor housing. The full load amp
rating for the motor is listed on the name
plate.
e. Engage the electrical power supply and start the unit.
f. The amp meter will display the motor amps. Compare the actual motor
amps as displayed on the amp meter to the full load amp rating as listed
on the motor name plate.
g. If the amp draw is excessive (higher than the listed name plate amp
rating), a throttling valve must be installed in the “from process” water
Pump Motor Controller
Normal Operating Position Tripped Position
WARNING: Electrical power is engaged and caution should be employed while the cabinet is
open.
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