Vogt TUBE-ICE P-118F, Service Manual

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P118F Service Manual
INSTALLING YOUR TUBE-ICE
®
MACHINE
1/6/09
3-5
Voltage Unbalance Voltage unbalance can cause motors to overheat and fail. Voltage imbalance
between any two legs should be no greater than 2%.
Example: Supply voltage = 230-3-60
Voltage Readings:
AB = 220 Volts
BC = 225 Volts Average = (220 + 225 + 227)/3 = 224 Volts
AC = 227 Volts
(AB) 224-220 = 4 Volts (Highest Deviation)
(BC) 225-224 = 1 Volts
(AC) 227-224 = 3 Volts
% Voltage Unbalance = 100 x (4/224) = 1.78% “Acceptable”
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. Cutter and pump motor rotation are factory synchronized but must be checked at
installation. For ice production, the cutter disc, as viewed at the ice discharge opening should turn
from left to right (crushed rotation should be from right to left). To change direction of rotation,
disconnect power and reverse L1 and L3 (incoming power wires) at the terminal block.
! CAUTION !
Do not attempt to start machine prior to connecting water lines
and making the following NECESSARY provisions.
Refer to FIGURE 3-1 & 3-2 (space diagram) for correct installation.
! CAUTION !