Vogt P-24AL, Service Manual

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P24AL & P34AL Service Manual
INSTALLING YOUR TUBE-ICE MACHINE
12/2016
3-17
Important: If the supply voltage phase unbalance is more the 2%, contact your local electric
utility company.
Current Unbalance. Voltage unbalance will cause a current unbalance, but a current unbalance does
not necessarily mean that a voltage unbalance exists. A loose terminal connection or a buildup of
dirt or carbon on one set of contacts would cause a higher resistance on that leg than on the other two
legs. Current follows the path of least resistance, therefore if terminal connection L1 is loose or
dirty, L2 and/or L3 will have higher current.
Higher current causes more heat to be generated in the motor windings. The maximum acceptable
current unbalance is 10%.
Example:
Current Readings:
L1 = 96 Amps
L2 = 91 Amps Average = (96 + 91 + 98)/3 = 95Amps
L3 = 98 Amps
(L1) 96-95 = 1 Amps
(L2) 95-91 = 4 Amps (Highest Deviation)
(L3) 98-95 = 3 Amps
% Current Unbalance = 100 x (4/95) = 4.2%
“Acceptable”
Rotation Check.
The compressor, cutter, and pump motor rotation are factory synchronized, but
must be checked at installation. For cylinder ice production, the cutter disc as viewed at the ice
discharge opening should turn from left to right.
Check rotation by the following procedure:
1.
Turn the power to the machine on and check voltages.
2. Make sure the water tank is full of clean water.
3. Turn the HAND/AUTO switch (ISS) to HAND position. The water pump will start and the
FREEZING (1LT) and the LIQUID FEED (2LT) pilot lights will illuminate. Check pump
rotation.
4. Push the MANUAL HARVEST button. The water pump will stop, the FREEZING and LIQUID
FEED lights will go out, and after 20-30 seconds, the cutter motor will start. The thawing gas
solenoid valve will open and the THAWING pilot light (3LT) will illuminate.
5. Check the cutter disc rotation. It should be turning from left to right (CCW looking from the
top).
6. Turn the HAND/AUTO switch to AUTO to stop the cutter.
To change rotation, follow this procedure:
1.
Disconnect power to the machine and lock it out to make sure it can’t be turned back on.
2. Check for power at L1, L2, L3 with a volt meter to make sure it is off.
3. At the cutter motor circuit breaker (CB3) or at the power disconnect, reverse wires L1 and L2.
4. Make sure these terminals are tight and restore power to the machine.
5. Perform rotation check again to confirm that it is correct.