9.13 Clean Servo Motor Cooling Lines
CAUTION
Open loop cooling can result in hard water deposits that may clog the
narrow cooling channels inside the motors.
Cooling Line Contamination” for more information.
Lines that are partially blocked can be cleaned. See “9.13.2 Cleaning
Recommendations”. If the channels are completely blocked then the motor
must be rebuilt or replaced. Contact your service representative.
CAUTION
Mold-Masters
recommends using closed loop cooling to keep the cooling
channels free of contamination.
9.13.1 Indications of Cooling Line Contamination
The condition of the cooling lines can be seen by inspection. The figure below
shows three examples of clear blue 3/8 in. tubing. Calcium deposits make the
tubing appear green (or pink in the case of clear red tubing) and opaque.
Consistently high servo motor temperature, at or above the warning or alarm
levels default 75°C and 80°C (167°F and 176°F) respectively, may also
indicate that cooling lines are contaminated.
A
B
C
A) New 3/8” water tube
B) Used tubing in good
condition (no obstructing
deposits)
C) Heavy sediment deposit
Figure 9-1 Comparison of clean and contaminated cooling lines
9.12 Move the E-Multi Injection Unit for
Maintenance
1. Purge plastic from the system.
2. Retract the carriage so that the nozzle tip is on the E-Multi side of the
adapter plate.
3.
Secure the machine. See “E-Multi Weight Specifications” on page 3-20.
4. Unbolt and separate the E-Multi injection unit from the molding machine.
5. Purge cooling water from the system.
6. Disconnect water, pneumatic, I/O, heater and motor connections from the
E-Multi injection unit.
7. Place the E-Multi injection unit, in horizontal position, onto a work bench
or machine maintenance stand capable of supporting the full machine
load.
9-9
MAINTENANCE
E-Multi User Manual
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