Dairy Tech Platinum Series, Руководство оператора

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[22]
Rev 4/15/14
Dairy Tech, Inc.
Service Manual: DT10G, DT30G &DT60G
the control itself and must be
returned for servicing or replaced
b.
“OPEN” error indicates that there is
a failed sensor (thermocouple wire),
broken connection, or an internal
input circuit has failed. Check the
thermocouple wire and the
connections into the back of the
control at terminals #2()
and #3(red -). Replace
thermocouple.
c.
“ERROR” … a fault has caused the
equipment calibration to become
corrupted. Call for recalibration
options or return/replace the control.
d.
“HIGH” or “LOW” … the process
value or temperature of the product
is beyond the limits set for the
control to operate in. Be sure to
operate in a room without severe
conditions. Replace the control if
error persists in normal conditions.
9. Temperature Display is erratic or incorrect.
a. Troubleshooting the thermocouple
system
b. The thermocouples are polar
sensitive and will yield erratic
numbers or even move down in
temp when the process is heating if
they are wired in reverse. The unit
may also flash an unusually high
number and then immediately
indicate that the cycle has ended.
Make certain that purple or white
leads are positive (+) and red leads
are negative (-) at all junctions.
10. Milk is separated or congealed
a. The most common cause for milk or
colostrum to separate or congeal is
acidification of the milk caused by
two processes:
i. Fermentation of the milk by
bacteria will cause the release of
lactic acid and other acidic by-
products resulting in a lower pH
of the milk. This in turn allows
it to separate. The heat of
pasteurization will exacerbate
this problem. To control this,
cool the milk during holding
stages or pasteurize the milk
sooner after collection to
prevent the start of fermentation.
ii. Acidic cleaners are not being
rinsed from the system. Rinse
properly before each use. Do not
use acids to clean the aluminum
parts as this can cause severe
damage to the tanks and pose a
safety risk for the employees.
b. Thickened milk or colostrum that is
stuck to the tank may be due to:
i. Improper stirring (make certain
the propeller is moving during
heating, time out and cooling
cycles)
ii. Temperatures that are too high
(rarely a problem since our units
cannot superheat water).
11. Stir motor is not turning
a. Check the fuse for the motor F2
b. If the fuse is good, make certain that
the wire to the motor has not been
damaged or pulled out of the
terminal block high.
c. If there is power to the motor and it
will not turn, replace the motor.
d. If there is no power to the motor and
the fuse is good, check the control.
There should be 115vac from
terminal 24 to a neutral wire during
heating or cooling. During heating,